ORD-ONI Technical Intelligence Bulletin
ORD-ONI Technical Intelligence Bulletins are published jointly by the Bureau of Ordnance and the Division of Naval Intelligence to provide a convenient medium for the rapid dissemination to the operating forces of current intelligence on foreign matériel.
A Statistical Summary of Japanese Naval Matériel
(REV. 2)
CONTENTS
Torpedoes, Armament by Warship Types
Mines -- Japanese and Captured Allied Types
THIS summary has been assembled in response to many requests from the operating forces for a concise tabulation of current information on Japanese Naval Matériel. The data have been assembled and revised as of 1 December 1944, but as new data become available it is proposed to issue revisions of this summary.
More detailed reports on single items of equipment or on specific subjects will be published, as before, whenever the interest in the subject and the data available warrant the issuing of an ORD-ONI Technical Intelligence Bulletin.
The material and statistics included in this summary were complied by the Division of Naval Intelligence and the Research and Development Division of the Bureau of Ordnance from data furnished by the Naval Torpedo Station, Newport, R. I., the Naval Research Laboratory, the Mine Disposal School, the Naval Communications Division (Chief of Naval Operations), and the Submarine Operations Research Group.
The information in these tables represents the best available data on Japanese naval, matériel. However portions of it are from translated Japanese documents and prisoner-of-war testimony. Although these have been carefully screened and the most plausible used, they may be subject to change as actual matériel becomes available.
Mere Detailed Information Can Be Obtained by Referring to Bulletins on Special Subjects.
Additional copies can be obtained at District Intelligence Offices, Field Intelligence Centers, or direct from ONI by addressing the Technical Intelligence Center, Room 4638, Navy Department, Washington, D. C.
The accompanying tables supersede all information previously issued in ORD-ONI #5. These tables supplement also the Matériel Section of the newly published operating manual, ONI 222-J -- A Statistical Summary of the Japanese Navy.
List of ORD-ONI Bulletins already issued --
ORD-ONI #1 -- A General Survey of Japanese Naval Ordnance #2 -- Japanese Dual-Purpose and Anti-Aircraft Weapons #3 -- German Naval Mines and Minelaying Craft #4 -- Japanese Naval Vessels -- Fields of Fire Diagrams #5 -- A General Survey of Japanese Naval Ordnance and Equipment (Rev. 1.) #6 -- Classification SECRET #7 -- Japanese Merchant Ship Armament #8 -- Japanese Mines and Minelaying Vessels
| Nominal bore | Caliber | Actual bore | U.S. Mount Designation | Jap Designation Year Type | Mount Tree | Projectile Wt. (lbs.) | Muzzle Velocity ft. sec. | Maximum Elevation | Range (yds.) at 20° elev. | Range (yds.) at 25° elev. | Range (yds.) at 30° elev. | Range (yds.) at 35° elev. | Maximum surface range (yds.) | Maximum effective AA ceiling (ft.) | AP Penetration in Inches at 90° | ||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 5,000 yds. | 10,000 yds. | 15,000 yds. | 20,000 yds. | 25,000 yds. | 30,000 yds. | ||||||||||||||||
| BB - YAMATO Class - 9 | 16" | 50? | 16"? | J16/2 | Triple S. P. | 40° | 40,546 | ||||||||||||||
| BB - NAGATO Class - 8 | 16" | 45 | 15".75 | J16/1 | 3 | Twin S. P. | 2,205 | 2,592 | 35° | 26,900 | 30,500 | 33,600 | 36,000 | 36,000 | 17.9 | 14.4 | 11.9 | 101. | |||
| BB - ISE, FUSO Classes - 12; KONGO Class - 8 | 14" | 45 | 14".17 | J14/1, 2 | 41 | Twin S. P. | AP 1,400 | 2,526 | 35° | 24,300 | 27,500 | 30,000 | 31,950 | 31,950 | 16.6 | 12.8 | 9.8 | 7.8 | 6.5 | ||
| CA -- NACHI, ATAGO, MOGAMI Classes -- 10; AOBA Class-6; TONE Class -- 8. | 8" | 50 | 7".87 | J8/2 | 3 | Twin S. P.6. | AP 254 | 2,789 | 42° | 23,400 | 26,190 | 28,400 | 30,300 | 31,100 | 8.7 | 6.2 | 4.6 | 3.5 | 2.8 | ||
| OCA - ISUMO Class, YAKUMO - 4 | 8" | 45 | 7".87 | J8/1 | Twin S. P. | AP | 2,493 | 24° | 15,000 | 16,400 | 8.6 | 4.8 | 3.3 | ||||||||
| BB -- YAMATO Class-12; CL - AGANO Class -6 (Tentative) | 6" | 50 | 6".1? | J6/3 | Twin S. P.1. | AP | 3,018 | 40° | 29,237 | ||||||||||||
| BB - FUSO Class - 16; KONGO Class - 14; YAMASHIRO - 14 | 6" | 50 | 5".9 | J6/2 | Single S. P. casemate. | AP 100 | 2,789 | 30°4. | 17,300 | 21,358 | 6.9 | 3.8 | 2.6 | 1.9 | |||||||
| OCA - ISUMO Class, YAKUMO - 8 | 6" | 40 | 5".9 | J6/1 | Single S. P. casemate. | Ord. | 2,296 | 23° | 12,900 | 13,670 | 5.0 | 3.0 | |||||||||
| BB - NAGATO Class - 18; ISE Class - 16 | 5".5 | 40 | 5".5 | J5.5/1 | Single S. P. Casemate. | Ord. 84 | 2,296 | 32° | 17,400 | ||||||||||||
| CVL -- HOSHO -- 4; CVS -- KAMOI -- 2; CL(T) -- KATORI Class -- 4; KUMA, NATORI Classes - 7; SS - I-1, 5, 9, 15, 41, 54, 121, 176 Classes - 1. |
5".5 | 50 | 5".5 | J5 5/2 | 3 | Single S. P. | Ord. 84 | 2,789 | 30° | 17,300 | 19,100 | 20,700 | 20,700 | 6.6 | 3.7 | 2.5 | 1.8 | ||||
| DD -- ASASHIO - KAGERO, FUBUKI Classes -- 6; HATSUHARU, SHIGURE Classes - 5. | 5" | 50 | J5/1 | 3 | Single Twin S. P. | Ord. 63 | 2,900 | 46° | 16,200 | 17,900 | 19,350 | 20,350 | 21,030 | 5.3 | 2.8 | 1.8 | 1.5 | ||||
| BB -- YAMATO Class -- 12; CL(T) -- KATORI Class - 2; NAGATO, FUSO, ISE, KONGO Classes -- 8; CV -- SHOKAKU, HAYATAKA Classes - 16; ZUIHO Class -- 12; CVL -- CHITOSE Class - 6; CVE -- OTAKA Class -- 6; DD -- MATSU Class -- 3. | 5" | 40 | 5" | J5/2 | 89 | Twin D. P. | 2,360 | 85° | 15,260 | 36,000 | |||||||||||
| CA -- NACHI, TONE, MOGAMI Classes 8; AOBA, ATAGO Classes -- 4. | 4".7 | 50 | 4".72 | J4.7/5 | 10 | Single Twin D. P. | 45 | 2,706 | 85° | 14,800 | 16,300 | 17,500 | 18,450 | 19,400 | 25,000 | 1.4 | |||||
| DD -- MUTSUKI, KAMIKAZE Classes -- 4 | 4".7 | 502. | 4".72 | J4.7/3 | Single S. P. | 45 | 2,998 | 45° | 13,820 | 15,200 | 16,300 | 17,200 | 17,900 | 4.2 | 2.0 | 1.2 | |||||
| DD -- MINEKAZE Class -- 4; WAKATAKE, MOMO Classes -- 3. | 4".7 | 45 | 4".72 | J4.7/1 | Single S. P. | 45 | 2,772 | 45° | 13,390 | 14,790 | 15,900 | 16,679 | 17,580 | 3.6 | 1.7 | ||||||
| SS - I-151, 153, 161, 168, RO-26, 29 Classes -- 1. | 4".7 | 40 | 4".72 | J4.7/2 | Single S. P. | 2,165 | 20° | 10,900 | 10,900 | 2.5 | 1.5 | ||||||||||
| PF - MIKURA Class. | 4".7 | J4.7/6 | Twin D. P. | 85° | |||||||||||||||||
| DD -- TAKANAMI Class -- 6; SHIMAKAZE Class.3.DD -- TERUTSUKI Class -- 8. | 4" | 505. | 3".94 | J4/2 | Twin D. P. | 2,854 | 85° | 17,740 | |||||||||||||
| SS - I-165 -1 | 4" | 40 | 3".94 | J4/1 | Single S. P. | 32 | 25° | ||||||||||||||
| CVL -- HOSHO -- 2; CVL -- CHITOSE Class -- 4; KAMOI -- 2; CA -- TONE Class -- 8; MOGAMI Class - 4; CL -- KUMA Class -- 2; NATORI Class 3; SS - RO 33, 57, 60 Classes -- 1; also on M/S & misc. vessels. | 3" | 40 | 3" | J3/2 | 3 | Single D. P. | 14.5 | 2,231 | 85° | 9,000 | 10,000 | 10,700 | 11,250 | 11,600 | 20,000 | 1.1 | .6 | ||||
| OCA -- IZUMO Class, YAKUMO -- 4. | 3" | 40 | 3" | J3/1 | 1898 | Single S. P. | 12.5 | 20° | 8,000 | ||||||||||||
| Armored boats. | 2".2 | 2".24 | Single S. P. | 30° | 6,600 | ||||||||||||||||
1 Triples reported on some units of AGANO Class.
2 May be 45 caliber.
3 Speculative, may be 5".
4 Elevation Increased as Indicated
5 May be 60 caliber.
6 Time fine projectiles reported used against aircraft.
NOTES --
As this goes to press, armor penetration data contained
herein is being revised by the Bureau of Ordnance from evidence recently
acquired.
| Caliber | Type | Effective Horizontal Range (yds.) | Slant Range in Feet | Length Over-all | Length of Barrel | Weight of Gun (lb.) | Maximum Rate of Fire (rpm) | Practical Rate of Fire (rpm) | Type of Feed | Magazine or Belt capacity | Muzzle Velocity ft/sec. | Ammunition | Weight of projectile | Elevation and depression | Operation | Cooling | Sights | Remarks | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Extreme Deterent | Maximum Hitting | Effective Hitting | ||||||||||||||||||
| 6.5 mm (.256") | Model 90 (1936) Resembles British BREN. |
1,650 | 2,000 | 2,000 | 1,500 | 3' 5 1/2" | 1' 1/2" removable | 20 without bayonet or magazine. | 550 cyclic | 200 | 30 | 2,410 | Model 38 (1905) semi-rimmed reduced propellant. | 0.304 oz | Gas | Air | Blade front sight. Leaf rear sight. |
Telescopic sight. Now equipped for flash hider. Windage adjustment. | ||
| 6.5 mm (.256") | Model 11 (1922) Hotchkiss Type. |
1,640 | 2,000 | 2,000 | 1,500 | 3' 7 1/2" | 1' 7" | 22.5 | 500 cyclic | 150 in 5-round bursts. | 5 round clips | 30 | 2,440 | Ball, standard and reduced charge 2 grams. | 0.304 oz | Gas full automatic. | Air | Blade front sight V-notched; rear leaf sight. | Replaced by Model 96. Rear sight elevation 328-1640 yds; most accurate at 600 yards. Fully automatic. No windage adjustment. | |
| 6.5 mm (.256") | Model 3 (1914) Modified Hotchkiss | 1,000? | 3' 11 1/2" | 67 mounted | 500 cyclic | 200 | Strip | 30 | 2,437 | Ball, standard and reduced. | 0.304 oz. | 15° to 90° | Gas | Air | No AA sight | Replaced by Model 92 AMG 1932, but still employed. Used for AA by naval landing forces. | ||||
| 7.7 mm (.303") | Model 99 (1939) Hotchkiss Type. | 2,000 | 3,500 | 3,000 | 2,400 | 3' 6" | 1' 9 3/4" | 22 without magazine. | 800 cyclic | 250 | Box-type magazine. | 30 | 2,300 | Ball, AP, Incendiary Tracer. | 0.467 oz. | -4° to +90° | Gas | Air | Blade front sight; rear peep sight. | Very similar to Model 96, 6.5 mm., 1936. Flash hider fixed on barrel. Windage adjustment. |
| 7.7 mm (.303") | Model 92 (1932) | 2,000 | 3,500 | 3,000 | 2,400 | 3' 9 1/2" | 2' 5 1/2" | 61, mounted 122 | 450 | 200-250 | Left-hand feed strip. | 30 | 2,400 | Ball. AP & Incendiary Tracer every 5 rds., semi-rimmed. | 0.467 oz. | 90° | Gas | Air | Telescopic Special AA ring sight. | Replaces Model 3, 1914, 6.5 mm. Most accurate at 875 yards. Takes 45 seconds to emplace and remove flash hider. Can also use 7.7 mm. rimless mounted or strips. |
| 7.7 mm (.303") | Model 92 (1932) Lewis Type | 2,000 | 3,500 | 3,000 | 2,400 | 2' 2 1/8" | 26 | 600 | 300-350 | Flat circular magazine | 47 | 2,300 | Ball, AP, Incendiary, Tracer. | 0.407 OZ. | -8° to +80° | Gas automatic | Air | Aperture and Blade. | Japanese version of the British Lewis is almost an exact copy. | |
| 12.7 mm (.50") | Model 90 (1930) Arisaka | 2,500 | 5,000 | 3,500 | 3,000 | 400-500 | Drum or belt | 257 | 2,998 | Ball; tracer | 85° with AA adapter. | Gas | Air | Used in Philippines. Not reported recently. | ||||||
| 13.2 mm (.52") | Model 93 (1933) | 3,000 | 5,000 | 4,000 | 3,500 | 5' 5" with flash hider | 87 without mount or magazine | 450-480 | 120 per barrel | Box-type magazine. | 30 | 2,624 | Ball; AP, Tracer | 0.114 lb. | 0° to 85° | Gas -- semi or full automatic. | Air | Rear and leaf Ring-Bofors type -- Course and speed sights. | Designed for Navy but used by Army. Single and twin mounts. Separate sleeves in twins. Copy of the French Hotchkiss. | |
| 20 mm (.79") | Model 98 (1938) Oerlikon Type. | 3,750? | 4,500 | 3,500 | 9' | 4' 1 1/2" | 152 | 250 | 120-150 | Round-box magazine. | 20 | 2,720 | HE, AP, Tracer, HET (self-destroying). Oversize round reported. | 8.8-14.5 oz. | -10° to +85° | Gas -- semi or full automatic. | Air | Lateral vertical deflection computer. | Emplaced in less than 3 minutes. Similar to U.S. Naval 20 mm. gun. Ammo not interchangeable with 20 mm Type 97 anti-tank gun. Reported manufactured under license near Yokosuka. Principal Army medium AA Gun. | |
| 25 mm (.98") | Model 96 (1936), Model 95 (1935), Army-Navy Gun. | 4,000 | 10,500 | 6,000 | 4,500 | 8' 5 1/2" | 4' 4 1/4" | 5,330 3 guns mounted. | 210 cyclic per barrel. | 175 | Clips on vertical box magazine. | 15 | 2,952 | HE, HET (self-destroying), Incendiary tracer, AP. | -10° to +80° | Gas -- semi or full automatic. | Air | Calculating | Principal Navy medium AA Gun. Also used ashore. Sighting system same general principle as 75 mm. AA. Naval twins and triples observed; quads reported. Three modifications of this gun are believed designated Types 94, 95 and 97. | |
| 40 mm (1.57') | (1931) Vickers Type. | 6,000 | 15,000 | 6,500 | 5,100 | 5' 2" | 3,700 mounted | 120 per barrel. | 60 | Disintegrating link belt. | 1,968 | Tracer, AP, HE with time fuze, HE, pt. Det. | 1.95 lb. | -5° to + 85° | Recoil operating. | Water | Telescopic calculating sight. | Water-cooled. Twin mount is believed to bo a Japanese adaptation of Vickers (1931), single 40 mm. captured and used in fair numbers. The Bofors 40 mm. is also in use. Reports also indicate use of Jap single 40. | ||
High Explosives: HE -- High Explosives
HEI -- High Explosive Incendiary
HET -- High Explosive Tracer
AP -- Armor Piercing
Pt. Det -- Point Detonating
NOTES --
| Type | Used on. | Diameter | Length | Length warhead | Length flasks | Length afterbody and tall | Power source | Fuel (pints) | Water (Pints) | Oil (pints) | Type explosive | Ingredients | Charge weight (lbs.) | Type exploder | Air flask pressure (lbs. sq. in.) | Total weight (ready for war run) | Depth setting | Speed (kts.)/range (yds.) | Remarks |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 44 | Old ships, picket boats. | 17.7" | 441 | 3153 | |||||||||||||||
| 44, Mk. 2, Modification 1. | PT's | 17.7" | 18'8" | 4' 1" includes exploder | 10' | 4'10" | 4 cylin. eng. | 97, 98 | HND 40/TNT 60, HND 40/trinitro-anisole 60. | 460 | Bent lever | 1830 | 36/4300
26/8700 |
Being or has been replaced by Type 2.
4 tail fins. | |||||
| 89 | SS's, DD's, training cruisers, MTB's. | 21" | 23'8" | 3'8" | 10' 5" | 9'4" | 2-cylinder, double-acting engine. | 26 | 123 | Shimose, 97, 94. | Picric acid, HND 40/TNT 60, cyclonite 40/trinitro-anisole 60. | 625, Shimose 661, 97 or 94. | Bent lever; Impact. | 3000 | 3673 | 16'-39' | 45/6014
43/6561 35/11,000 |
Various explosive weights reported. | |
| 89. Change 1 | SS's | 21" | 23'6" | 3'8" | 13'5" | 6'4" | 2-cylinder engine. | 94, 97, Shimose | 660 | Ball | 3660 | 45/6000
43/6550 35/10,900 |
Probably used on older SS. oxygen torpedo, type 96,
will probably replace it.
Has 4 tail fins. | ||||||
| 89, Modification 2 | SS's | 21" | Shimose, 94 | Picric acid, cyclonite 40/trinitro-anisole 60. | 625, Shimose 648, 94. | Bent lever; impact | Variation from Type 89 in warhead only. | ||||||||||||
| 90 | DD's, CA's, CL's | 24" | 27'10" | 3' 11" | 13' | 10'11" | 2-cylinder engine. | 211 | S3 | Shimose, 94 | Picric acid, cyclonite 40/trinitro-anisole 60. | 880 | Ball, type 90 | 3184 | 3520 | 7'-59' | 45/8760 (triple)
42/10,940 32/16,410 |
Now largely replaced by Type 93. | |
| 91 | A/C, PT's | 17.7" | 17'2" | 3'2" | 8 cylinder radial engine. | Shimose, 94, 97 | Picric add, HND 40/TNT 60, cyclonite 40/trinitro-anisole 60. | 342 | Ball | 1715 | 42/2000
42/2300 40/3000 |
||||||||
| 91, Modified | A/C | 17.7" | 17'4" | 3'10" | 8 cylinder radial engine. | Same as for 91. | 484 | Ball | 1720 | 45/1641
42/2188 35/3282 |
Air speed at release, 190 knots. Altitude, 160'. | ||||||||
| 91. Change I | A/C, PT'S | 17.7" | 17'3" | 3'2" | 8'11" | 5'2" | 8-cylinder radial engine. | Same as for 91 | 338 | Ball | 2040 | 1730 | 42/3300 | Rivets on warhead.
Long horizontal fins, short vertical fins, 4 in all. Poor control. Superceded by Type 91, Change 3. | |||||
| 91, Change 2 | A/C, PT's | 17.7" | 18' | 3'10" | 8'11" | 5'2" | 8-cylinder radial engine. | Same as for 91 | 420 | Ball | 2040 | 1840 | 42/3300 | 8 fins.
Anti-roll flippers. Free wheeling. Used at Pearl Harbor. | |||||
| 91, Change 3 | A/C, PT's | 17.7" | 17'4" | 4'9" | 7'4" | 5'2" | 8-cylinder radial engine. | Type 97 | HND 40/TNT 60. | 522 | Ball and other paravane type. | 2560 | 1800 (approx.) | 42/3300 | 8 fins, wider horizontal rudder, longer vertical fins
for better stabilization.
Provision for anti-roll flippers. Free wheeling propellers. | ||||
| 91, Change 3. with Change 6 Warhead. | A/C, PT's | 17.7" | 18'9' | 6'2" | 7'4" | 5' 2" | 8-cylinder radial engine. | Type 97 | 812 | Ball | 2560 | 2100 (approx.) | 42/3100 | 8 fins.
Anti-roll flippers. Free wheeling propellers. | |||||
| 91. Change 3 or Change 5 with Type 3 Service Head. | A/C | 17.7" | 18' (approx.) | 5'5 1/2" | 7'4" | 5'2" | 8-cylinder radial engine. | 475 | Hydroplane type. | 2560 | 1800 (approx.) | Appears to be same as Type 91, Change 3, but warhead
and exploder are entirely new.
Markings on warhead read, "Type 3 Service Head for use with Type 91, Rev. 3 or Rev. 5 Torpedo." The distinguishing characteristic is a "plane" on the end of a bowden wire which probably streams above the torpedo increasing the vertical target area. The exploder is cocked by tension in excess of 70 lbs. on the tow wire. Subsequent release of tension to less than 70 lbs. gives instantaneous firing. This pistol is used in addition to the normal bail type. | |||||||
| 91, Change 6 | A/C | 815 | 2000 | 41/2187 |
| Type | Used on | Diameter | Length | Length warhead | length flasks | Length afterbody and tail | Power source | Fuel (pints) | Water (pints) | Oil (pints) | Type explosive | Ingredients | Charge weight (lbs.) | Type exploder | Air flask pressure (lbs. sq. in.) | Total weight (ready for war run) | Depth setting | Speed (kts.)/range (yds.) | Remarks |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 92. | SS's | 21" | 23'8" | TNT 60/HND24/-AL 16. | 660 | Impact or impact magnetic. | 3369 | 10' for impact, 40' or less for magnetic. | 28/3300 (cold run); 30/5400 (pre-warmed) single speed. | Electric trackless. Distinctive whining noise audible at short distances. Batteries must be pre-warmed and recharged every 48 hours. Patterned on German G7E. May not be used. | |||||||||
| 93. Mod. 2. Change 1. | DD's, CA's | 24" | 29' 6" | 4'6 1/2" | 18'1" | 6'-9.6" | 2-cylinder engine, oxygen. | 216 | (Note 1) | 97 | 1080 (approx.) | 3200 approx. | 6000-6500 (approx.) | 50/22, 400-31, 400, 40/33, 800-47, 400. | 4 tail fins. | ||||
| 94, Modification 1 | A/C | 22' | (Note 2) | Shimose, 97 | Picric acid HND 40/TNT 60. | 867 | 3345 | 45/4923 | Air speed release 145 kts., altitude, 82'. | ||||||||||
| 94, Modification 2 | A/C | 18" | 17'4" | 5' | 462 | 1823 | 42/3300 | Air speed release 170 kts., altitude, 66'. | |||||||||||
| 95. | SS's | 21" | 23'8" | 2-cylinder engine (Note 2). | 97 | HND 40/TNT 60 | 880 | 3520 | 38/4900 35/7100 | Practically invisible wake. | |||||||||
| 96. | Reported do data. | ||||||||||||||||||
| 97.* | Midget SS's | 17.7" | 18'5" | 5'10" | 7'11" | 4' 7" | 2-cylinder engine (Note 2). | 41 | Sea water pumped during run | 97 | HND 40/TNT 60. | 790 | Bail | 2500 | 2205 | 46/3500 | Small wake. 4 tail fins. | ||
| 6th year.* | SS's, cruisers | 21" | 22'5" | 3'1" | 12'9" | 6' 7" | 4-cylinder, steam. | 30 | 130 | Shimose | Picric acid | 451 | Bent lever | 2500 | 3200 | 37/7655 32/10,936 25/16,404 (triple). | 4 tail fins. Obsolete. | ||
| 8th year.* | DD's, CL's | 24" | 27' 6" | 3'9" | 16'7" | 6'11" | 4-cylinder, steam. | 97 | HND 40/TNT 60. | 880 | Bent lever | 5800 | 6'-59' | 41/10/950 32/16,400 26/21,900 | Probably superseded by recent revisions of Type 93. 4 tail fins. | ||||
| 12th year. | DD's | No data. Probably superseded by recent revisions of Type 93. | |||||||||||||||||
| New Kure | A/C | 18" | Probably steam | 97 | HND 40/TNT 60. | 660 | 1870 | 42/1600 | Air speed release 190 kts., altitude, 160'. 300 kts. at 164' reported. | ||||||||||
| 2 | A/C, PT's, Midget SS's. | 17.7" | 18' 4" | 5'11" | 776 | Type 90 or Type 2. | 2083 | 40/3300 | Expected to replace all other 17.7" types. | ||||||||||
| 2, Special | PT's | 17.7" | 18'5" | 5'11" | 2105 |
* Confirmed data from Naval Torpedo Station at Newport.
NOTES --
1. 13 pts. water used for initial start, sea
water pumped during run.
2. Oxygen-enriched air mixed with water and
kerosene to provide steam. Use of oxygen prevents nitrogen bubbles in exhaust
gases -- hence only propeller wake visible.
A WHITEHEAD TYPE Diameter: 21" may be used by the Japanese. Power source: 8 cylinder engine (all steel). Remarks: Built In England just prior to the War. Engine not the same as Type 91.
TORPEDOES BY SHIP CLASSES
Ship Class Type Number Carried Number Tubes (Type Mount) CA FURUTAKA ?-24" 16 8 (4 twins). AOBA 93 -- 24" 16 8 (2 quads). NACHI, ATAGO, MOGAMI. 93 -- 24" 32 16 (4 quads). TONE 8th year -- 24" or 93 -- 24" 32 32 -- 16 (4 quads). IBUKI 8th year -- 24" 8 (4 twins). CL J TENRYU 6th year -- 21" or 8th year -- 24" 16 6 (2 triples). -- (quads reported). KUMA, NATORI 6th year -- 21" and 93 -- 24" 32 8 (4 twins1.). 8 (2 quads). YUBARI 8th year -- 24" 8-12 4 (2 twins). SENDAI 93 -- 24" 16 8 (2 quads). AGANO 93 -- 24" 8 4 (1 quad2.). KATORI3. 6th year -- 21" 4 (2 twins). DD4 MINEKAZE, KAMIKAZE. 6th year -- 21" 12 6 (3 twins). MUTSUKI 8th year -- 14" 12 6 (2 triples). FUBUKI (SHINONOME, HIBIKI Groups). 90 -- 24" 18 9 (3 triples). FUBUKI (AMAGIRI Group) -- 21" 18 9 (3 triples). HATSUHARU-SHIGURE, ASASHIO-KAGERO. 93 -- 24" 16 8 (2 quads). TERUTSUKI 12th year or 93 -- 24" 8 4 (1 quad). TAKANAMI 93-24" 16 8 (2 quads). SHIMAKAZE 93 -- 24" 15 15 (3 quintuples). MOMO ? -- 18" ? 6 (2 triples). WAKATAKE -- 21" 4 (2 twins). MATSU 4 (1 quad). TB CHIDORI 89?-21" 2 (1 twin). OTORI 89? -- 21" 3 (1 triple). TRAD (Siamese) 18" 8 (2 twins and 2 singles). PG TAHCHIN (Siamese) 21" 4 (2 twins). PT PT-1 18" 2 2 -- side gear Mod. 1. PT-10, PT-201 (under construction). 44 or 91-18" 2 2 side gear Mod. 2. PT-101 18" 2 -- side gear. SS I-1 80 -- 21" 95? 22 6-4B, 2S. I-5, 6 89 -- 21" 20 6-4B, 2S. I-7, 8 89-21" 20 6-6B. I-9 89-21" 95? 20 6 or 8-6 or 8B. I-15, 16 89-21" 95? 20 6 or 8-6 or 8B. I-52 21" 4 2-2B. I-121 89-21" 20 4-4B. I-151, 152 6th year-21" 20 8-6B, 2S. I-153, 155 89 -- 21" 16 8-6B, 2S. I-161, 168 89-21" 14 6-4B, 2S. I-176 21" 12 6-6B. RO-26 6th year-21" 8 6-4B, 2S. RO-29 6th year -- 21" 8 4-4B. RO-33 89-21" 8 4-4B. RO-35 21" 10 4-4B. RO-51 18" 12 4-6. RO-57 6th year -- 21" 8 4-4B. RO-60 6th year -- 21" 12 6-4B, 2S. RO-100 21" 8 4-4B. MIDGET: SHIP-BORNE 18" 2 2-2B. SUB-BORNE 18" 2 2-2B. OCA YAKUMA 44? -- 18" 2. IWATE 44? -- 18" 4. 1. May have both 21" and 24" torpedo mounts.
2. Possibly additional tubes below A/C stowage deck. NOSHIRO of this class reportedly mounts 2 quads.
3. Now classified CL(T), Training Cruiser.
4. All DD's are thought to be undergoing refit from 21" to 24" torpedo mountings.Note 1. -- A tendency to standardize cruiser and destroyer torpedo mounts (Type 82, quad) appears to be underway. This mount is designed for the new and effective Type 93, 24" torpedo, now believed to be No. 1 on the Japanese torpedo production program.
Note 2 -- Although there is little evidence that Japanese submarines are using electric torpedoes, it is likely that the Type 92 will be used with increasing frequency. This type is believed patterned after the German G7E.
TORPEDO TUBES (Japanese)
Type tube Date of adoption Torpedoes used Mount 8th year (discontinued) 1919 8th year Type 92* 1932 All 24" torpedoes Quad. Type 93 1933 Type 89, 94 Twin. Tyne 89 1929 Type 90, 8th year Triple? 12th year 1923 Type 89, 6th year Twin. 6th year (Torp. Boats) 1917 Type 89, 6th year Twin. Single. *Type 92 tubes are power-trained and can be fired on bearings 73°-110° from ahead.
MINES
New and (old) designations Japanese designation Laid by- Charge weight and type Total weight Diameter Height Method of firing Case depth (maximum) Cable length (maximum) Safety devices Remarks Captured types JA (IV) Type 88, Modification 1 Sub 396 lbs. Picric 847# 33.9" 45.8" 4 chem. horns 66' 1400' Mech. det. retractor Offensive. Side arming switch 15-20 min. delay. JB (IV) Type 93, Model 1 Ship 220# Type 88 484# 34" 34" 4 chem. horns 246' 3,281' Str. shank mooring spindle in 12" base plate. Defensive or offensive. Similar to British H-2, Mk. II mine in base plate. JC (V) Mark 5, Modification 1. Ship 182# Picric blocks 456# 32.6" 33.6" 4 chem. horns 164' 525' Base plate mooring switch Defensive. Spring arming switch to cover. Obsolete since 1933. JD (XI) Mark 2, Explosive Hook, Modification 1. Towed 8 to 19# Picric or Type 88. 11.5" oa, 8" body. 26" oa, 10" body Control None Used against mines, nets, and under-water obstructions, it has also been found as a controlled land mine. Sweep book (Grapnel). JE (XIII) Small type mine, Model 1. Hand 45# Type 98 110# 20.5" hemispherical. 10.5" 2 chem. horns Beach Spring loaded arming switch Anti-boat mine laid in shallow water near beaches. It may be resting on the bottom or buried in sand except for horns. It has also been laid along abandoned air-strips to delay and harass clearance parties. JF (XIV) Type 94, Model 2 Hand or ship Type 88 190# approx 575#* approx 28.4" hemispherical. 25.6" Control Shallow None Has been found buried at a depth of 5 ft., laid on its side with the booster well up. Cables connect it to command post. Intended for use as harbor controlled mines. JG (XVI) Small type mine, Model 2. Hand 22# Type 98 52 1/2 to 62 1/2# 7", 14.5" truncated cone. 14.6" 1 chem. horn Beach Same as JE Anti-boat or anti-tank mine similar in operation and purpose to the JE type. Several slight variations occur in the shape; all are truncated cones. JH (XV) Unknown Ship 550# Picric (approx.) 1,000# (approx.) 41.4" 41.4" 4 chem. horns Str. shank mooring spindle in base. Spring arming switch in cover. Mooring bridle of four 15" chains. Unrecovered types Pear (I) Type 3, Mk. 6 Sub 440# Picric 900# approx 35.5" 45.3" 4 chem. horns 66' 155' Same as JA Offensive, submarine-laid contact mine. May be a modification of JA. Color is green over red lead. Banana (III) Unknown Ship 275# Type 88 35.5" Str. shank mooring spindle Defensive, moored contact mine laid by surface vessels. Similar to Dutch Vickers and British T Mk 3. Takes depth by plummet and is armed by a soluble washer. Apricot (VI) Type 96 Believed attached to nets. 121# Type 97 or 88 234# 20.1" 27.2" 300# or more tension 8'-300' Dragline runs from firing mechanism, a modifled Type 96 DC pistol, to bead rope of net panel. Defensive contact mine secured to anti-sub nets before the nets are laid. Used with Type 96, Mod. I, A/S net in defensive areas and Type 96 Mod. 2, net at advanced bases. Nets may be laid in water as deep as 700'. Grapefruit (VI) Type 96, Modification 1. Believed attached to nets. 132# Type 97 or 88 (Centered differently from Apricot). 249# 20.1" 27.2" 300# or more tension 8'-300' Shear pin to prevent arming on slight tensions. Same as Apricot. Persimmon (VII) Mark 6, Model 2, Modification 1. Ship 440# Type 88 903# 41.3" 40.2" 4 chem. horns 82' 3281' Arming mechanism believed similar to JC. Offensive moored contact mine. May be a variation of JH. Mod. 3 reported to have 4 on the upper hemisphere, 2 on lower. Blueberry (VIII) Type 93, Model 2 Ship 220# Type 88 484# 38.8" 33.8" 7 chem. horns 246' 3281' Same as JB Defensive, moored contact mine employed against surface craft or submarines. Fig (VIII) Type 93, Model 3 Ship 220# Type 88 484# 33.8" 33.8" 9 chem. horns 246' 3281' Same as JB Defensive. Avocado (IX) Unknown Ship 170# Type 88 450# 32.5" 32.5" Pendulum (elect.), inertia-impact. Mine is fired by tilting enough to allow pendulum to make 1 of 3 electrical contacts. Four -- types unknown Moored contact intensive mine using dry cells for firing. May be a copy of Dutch or Italian mine. Depth taking is by plummet. Pomegranate (X) Unknown Ship 41" 41" 6 chem. horns Mooring lever antenna switch. Defensive moored contact mine -- may be fitted with upper and lower Vickers type antenna. Base plate is similar to British Mk. XIV mine. Quince (XII) Type 92 Ship 1100# Type 88 2684# mine and anchor. 58".2 58.3" Control. Acoustic, Visual Monitor. 2 electric detonators. 196.8'. Normal 98'-13' - 30 min. after laying, marker buoy attached to case releases smoke signal, to assist observers in plotting mine's position. 1 hr. after laying, mine case separates from anchor. Depth taking by hydrostat. A moored controlled mine laid up to 18 mi. from shore in groups of 4 to 6, interval 426', minimum depth 100', distance between rows 524'. Max. depth water 393'. Effective range for damage to SS is 164', mortality at 65'±. It is monitored visually, or acoustically, by 3-15 strand electric cables (Models 1 & 2-4.921', Mod. 3-3,280') which can be used individually or joined. A permanent magnet moving iron type microphone detector is installed on top of each mine. This can be tuned and calibrated by sound control on shore. A new supersonic detector may be installed on later modifications. Grape (XI) Mk. 2 Explosive Hook. Towed 8 to 19# Picric Type 88 39# 11.5" oa, 8" body 25" oa, 10" body Control or automatic-tension fired. A towed sweep hook (Grapnel), for use against mines or underwater obstacles. Fired automatically by tension of 550 lbs. on firing device or manually by electricity. Plum Type 3, Mk. 1. Aerial Mine, Model 1. Aircraft No data. Lime Temp. Type 3, Electrical. Usually aircraft; also submarine or surface craft. 1950# 2398# 21" Length, 11'2" Thought to be influence type. 100' Similar in appearance to German Type GN, (which is magnetic), and has similar depth and countermining distances (560'). New Drifting Type1. Aircraft 150# Shimose 250# 14" 6' 1" (See Note 1). Note.- Banana, Avocado, and Pomegranate are the only mines whose information is not verified by captured documents.
1. Recovered Philippines. Submerged approx. 6' below surface. Portion out of water resembles small oil drum. Very sensitive switch horns. A tail section with fins separates and floats on surface.
ALLIED NATIONS' MINES IN POSSIBLE USE BY THE JAPANESE
Dutch:
- Percussion moored type.
- Dutch 7-horn moored type.
- Dutch Vickers, defensive moored contact type.
British:
- British Mk. XIV, XV, XVI, XVII, and XVIII -- moored mines.
The same case is used for each type. Size, number, and kind of horn varies.American:
- Mark 6, moored contact. 4 horns -- copper with steel cups in place of chemical horns. Upper and lower antennae may be fitted.
- Influence mines.
- Objects commonly reported as mines --
- U.S. D-3 and D-4 Mine Floats.
Steel floats 10" in diameter and 18" long with 3 or 4 steel horns set in copper cups.- Paravanes and minesweeping floats.
Tear drop shape with after fins for direction taking and 1 or 2 mooring eyes.
Range in length from 3' to 6'.- Anchorage and navigational buoys.
Many types may be found.
TORPEDO WARHEADS
Type 3 -- Torpedo warheads fitted with the "hydroplane" exploder have been found planted in shallow water as far as 200 yards from shore and 30 feet from installations of small boat obstacles.
The hydroplane wire is strung from the warhead to a control post on the beach and the obstacles were apparently intended to stop small landing craft, causing them to pile upon one another, detonating the warhead and serving the same purpose as a controlled mine.
This same warhead has also been buried along roadbeds with hydroplane wire tied to trees or posts on the opposite side of the road and serving as a trip wire for tanks and vehicles.
* With parachute. DEPTH CHARGE PROJECTORS
Type Depth Charge Type Thrower Mount Cartridge Type Distance Thrown 88 81 Single Mod. 2/3 213'/230' 91 81 Single Mod. 2/3 246'/279' 95 81 Single Mod. 2/3 246'/279' 95 (Rev. 1) 91 Single/Multiple 5 312'/197'
DEPTH CHARGES
Designation Type 88 Type 91 (Rev. 1) Type 93 Type 95** Type 95 (Rev. 1)** Type 95 (Rev. 2)** Type 95 (Mod 1) Type2 Type 2 (Rev. 1) Type 2 (Rev. 2) Yoke, (size type towed)*** Case Material Sheet Steel Sheet Steel Sheet Steel Shape and Color Cylinder, Grey Cylinder, Grey Cylinder, Black Overall Length 30.5" 30.5" 36" 30.5" 30.5" 30.5" 30.5" 5'. Diameter 17.7" 17.7" 17.7" 17.7" 17.7" 17.6" 118". Total Weight 525 lbs 353 lbs 441 lbs 352 lbs 457 lbs 374 lbs 374 lbs 474 lbs 374 lbs 154 lbs. Weight of Charge 327 lbs 220 lbs 220 lbs 352 lbs 242 lbs 242 lbs 357 lbs 242 lbs 55 lbs Sinking Rate 10.49'/sec 6.6'/sec.-3.37sec.* 98.4' (plus or minus) 6.3'/sec.-3.3'/sec.* 7.5'/sec.-3.9'/sec 6.6'/sec.-3.3'/sec 6.6'/sec.-3.37sec 90-460' 7.5'/sec.-3.8'/sec Depth Setting 78.7'-147.6' 8.2'-164' 98.4'-196.8'-295.2' 98.4'-196.8'-295.2'. 98.4'-196.8'-295.2' 98.4'-196.8'295.2' 98.4' - 196.8' - 295.2' -393.7' - 492.1'. 98.4' - 196.8' - 295.2" - 393.7' - 492.1'. Towed at 131.2' to 164'. Explosive Shimose Type 88 Type 88 Type 98 Type 1 (Temp.) Type 88, Type 1 Type 98 Type 88 Type 1 (Temp.) Cast. Type 88. Pistol Type Type 3 Type 3 Type 95 Type 95 Type 95 Similar to British Mk. VII. Seepage principle. Type 2. Similar to British Mk. VII. Type 95. Remarks One end of cage bolted to body and opening acts as a filling hole. Same size case as Type 88. Parachute used by slow craft. Parachute used to retard sinking rate. Used on destroyers. Parachute used with 98.4' depth setting. 0.7 lb. picric booster. Recovered. Parachute used on slow craft. 0.7 lb. picric booster. Mks. 1, 2, 3. Special boosters. Parachute used on slow craft. Recovered. Believed similar to Type 95 (Rev. 2). Parachute used with 98.4' setting. Variation of Type 95 (Rev. 2). Easily manufactured. Parachute used on slow craft. Recovered. Manufactured in 1944. Believed most recent design. End bolted and used as filling hole. Maximum towing speed 24 knots. Not widely used.
** Used on PC's.
*** Used on fleet and transport screening vessels, harbor defense patrol craft.
| Composition | Japanese designation | Form (*) | Shock sensitivity (no det.) cm | Frictional sensitivity (no det.) | Velocity meters/second | Power ratio | Melting point °C. (*) | Detonating point °C. | Color (*) | Use | Remarks (*) | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Picric acid | Shimose | Cast | 12 | Over 60 | 7,800 | 100 | 122-123 | 505 | Yellow, crystalline | Warheads, mines, and projectiles. | Most commonly used. Also used as booster in granular or pressed form. Toxic, stains yellow. Affected by high temperatures. | |
| Tetryl | Tetryl | Pressed powder | 11 | 40-50 | 7,300 | 118 | 129-130 | 350 | Light cream to pale yellow | Booster | Used as bursting charge in some 25 mm. AA, bomb fuze and projectile gaines. May have lead azide pellet cast in. Will not stain. Extremely dangerous. | |
| Ammonium perchlorate | 75 | Type 88 (4) | Granular powder | 17 | 30 | 4,200 | 170 | Decomposes | 430 | Dark grey crystalline | Mines, depth charges | Composition may vary 10 percent. Ferro-silicon may be free silicon or silicon carbide. Primarily an underwater explosive. Compares favorably with alumlnized underwater explosives. Very sensitive to friction. Power rating believed too high. |
| Ferro-silicon | 16 | |||||||||||
| Powdered wood | 6 | |||||||||||
| Crude oil | 3 | |||||||||||
| Trinitro-anisole | Type 91 | Cast | 19 | Over 60 | 6,600 | 105 | Unknown | 515 | Colorless crystalline | Bursting charge in A. P. shells | Also used to reduce the melting point of hexanitrodiphenylamine in type 98. Believed more sensitive than 19. | |
| Trinitrotoluene | Type 92 | Cast | 17 | Over 60 | 6,900 | 98 | 78-80.2 | 465 | Light honey to pale straw | Bursting charge in 40 mm. shells. | Army projectile charge. Slightly toxic. | |
| Cyclonite | 40 | Type 94 | Cast | 13 | 40-50 | 7,700 | 114 | Unknown | 430-440 | Unknown | Warheads | None. |
| Trinitro-anisole | 60 | |||||||||||
| Hexil (24) | 40 | Type 97 | Cast | 14 | Over 60 | 7,100 | 91 | 79-80 | 465 | Yellow, somewhat darker than picric. | Warheads | Very toxic. Stains brown. |
| Trinitrotoluene | 60 | |||||||||||
| Hexil (1) | 40 | Type 98 | Cast | 14 | Over 60 | 7,100 | 99 | 68-70 | 495 | Yellow, somewhat darker than picric. | Bombs | May also be found as 30/70 mixture in naval bombs. Very toxic. Stains brown. |
| Trinitro-anisole | 60 | |||||||||||
| PETN (2) | 50 | Pentolite (or pentoriru). | Cast | 16 | 30-40 | 7,200 | 100 | Unknown | 300 | Pale yellow | Unknown | Aircraft and anti-aircraft projectiles. |
| Trinitrotoluene | 50 | |||||||||||
| Ammonium picrate | 81 | Type 1 temporary (4). | Granular powder | 16-17 | Over 60 | 4,280 | 135 | Does not melt | 490 | Greenish brown | Depth charges | Designed for underwater use. Has distinctive oil odor. Little recovered. Characteristics not well known. Power rating seems too high. |
| Aluminum | 16 | |||||||||||
| Powdered wood | 2 | |||||||||||
| Crude oil | 1 | |||||||||||
| Trinitrotoluene | 60 | Otsu-B (4) (5) | Cast | 15 | Over 60 | 6,870 | 130 | 80 | 460 | Dark grey-green | Future torpedo warheads | Evidently a copy of German "Hexanite." Toxic. Stains brown. More sensitive than TNT. May be used in mines and depth charges. Power rating believed too high. |
| Hexil (21) Aluminum | 16 | |||||||||||
| Fulminate of mercury* | Raiko | Granular or pressed | 2 | Unknown | 5,400 | 49 | 140 | 210 | Light grey to tan crystalline | Initiator | Used in detonator in pressed form; in gaine in granular form, loosely loaded in copper cup. Very sensitive. | |
| Lead azide* | Chikkaen | Pressed pellet | 5.5 | Unknown | 5,300 | 40 | 280 | 335 | Creamy white to buff | Initiator | Used as small pellet in gaine of PETN, cylonite, or tetryl. Set off by flash from percussion cap. Less sensitive to shock than fulminate of mercury. | |
| Potassium chlorate, antimony sulphide | Unknown | Pellet | Unknown | Unknown | Unknown | Unknown | Unknown | Unknown | Unknown | Priming mixture | Fired by striker for flash. | |
| PETN (2)* | Shoelyako | Pressed | 6.5 | Unknown | 8,300 | 116 | 141 | Unknown | Chalky white to grey | 12.7 and 20 mm. shells (also in boosters). | None. | |
| Cyclonite* | Unknown | Pressed | 7.5 | Unknown | 9,300 | 130 | 202 | Unknown | Chalky white crystalline | 70 mm. barrage shell booster charges and gaines. | As booster, usually has pellet of lead azide cast in. Extremely dangerous. | |
| Black powder | Non-smokeless powder.? | Ejector charge for illuminating shells and pyrotechnics. Delay and relays In bomb and projectile fuzes. | ||||||||||
| Single-base smokeless powder. | "C" smokeless powder.? | Ammunition propellant | ||||||||||
| Double-base smokeless powder. | Nitroglycerine? | Ammunition propellant | ||||||||||
(2) Pentaerythritetranitrate.
(3) The gaseous products of detonation and burning from all explosives are toxic.
(4) Explosives containing aluminum will burn violently in the open. Detonation may occur if they are confined. Type 88 also has these characteristics.
(5) Explosives which are more sensitive than TNT may detonate when fired upon.
*Information from translation of captured Jap chart, JICPOA Item No. 246B, except columns (*) compiled from MD, BD, and Army Engineers' reports.
LAND-BASED RADAR
The principal source of all RADAR information is OP-20 table of Sept. 44.
Designation Frequency mc. PRF Pulse length
MicrosecPeak power output Installation Use Maximum range (miles) Performance Type antenna and polarization Receiver Remarks Mk I Model I 97-103 1000 10-30 Rated 5 Kw, measured 3 Kw. Fixed ground A/C, possibly for surface search. A/C formation, 90; Single A/C, 42-64; BB and CA, 15.6; CL. 12; DD, 9; SS, Nil. Accuracy: Range, 500 M., bearing, 5°. Tests indicate poorer performance. Mattress. Separate T & R. Horizontal. Mount-on radar house. Entire building rotates. Double superhet. IF1, 21.50 Mc. IF2 3.5 Mc. Captured Guadalcanal. Modification I 92-105 1000 10-30 Rated 5 Kw, measured 2.7 Kw. Fixed ground A/C, possibly for surface search. A/C formation, 90; Single A/C, 42-54; BB and CA, 15.6; CL, 12; DD, 9; SS, NIL Accuracy: Probably same as Mk I Model I. Automatic rotating mechanism, variable rate. Horizontal. Double superhet. IF1, 21.60 Mc. IF2, 3.5 Mc. Captured Attu. Introduced in August 1942. Except for minor changes in rectifiers & tank circuit, same as Mk I Model I. Modification II Probably as for modification I. Possibly as low as 500. 20-40 Rated 30 Kw Fixed ground A/C, possibly for surface search. A/C formation, 180; Single A/C, 84-108; BB and CA, 31; CL, 24; DD, 18; SS, Nil. Accuracy: Range, 2,000 M., bearing 7°. Automatic rotating mechanism, variable rate. Horizontal. Some indication of installations in N. E. I. area. Mk I Model II 190-210 captured documents indicate best working freq. Is 194 Mc. as 200 Mc. is too high. Rated 1,000. Interceptions vary greatly, 100-3,000. Probably 2-10. but interceptions vary widely. Rated 5 Kw Ground.< Mounted on trailer chassis. A/C search. Beam admitted too high for surface search but documents indicate auxiliary use surface search. Probably the same as for Mk I Model I. Possibly 120 for A/C formation and 90 for single A/C. Captured documents record tracking of single A/C at 90 Mi. Mattress. Separate T & R, each 2 stacks, 6 half-waves long, auto rotating mechanism, variable rate. Mounted on radar house. Horizontal. Synchronizing unit, indicator, power supply & receiver, except for RF section, same as Mk I, Model I. Receiver bandwidth 500 Kc Power requirements: 200 v. 3 phase, 50-60 c. Captured document states a great many Mk I Model II radars are in use and indicate difficulties of tuning prevent quick freq. shift. Modification I As for Mk I, Model II Some modification 500. May also account for wide variation. Some modification 20-30. Indicated as a larger Mk I Model II Modification II As for Mk I, Model II Same as for Modif. I. Same as for Modif. I. Mk I Model III 150 500 10 Rated 10 Kw Ground, portable. Assembly time 2 1/2 hours. Housed in tent. A/C search. Effectiveness against surface craft unknown. Captured documents state single large A/C tracked at 150 Mi. Single collapsible with duplexing device. Light weight. Transportable in small boat or A/C. Type II 150 20 Rated 10 Kw Ground, portable, small & light. Search (presumably A/C search). Same as Mk I Model III. Metal screen eliminated. Single superhet. 2 RF stages. If 14.5 Mc with oscillator below signal freq. Bandwidth 0.1 Mc. Assembly time, several hours. Type III 150 Rated single A/C at 40 Bearing, 10°. Japanese Mk 13. "CHI" formerly Mk. 229. 60-80. Known spot freq. 60, 66, 72, & 78. 500-1000 25-35 30-50 Kw Ground, readily transportable. A/C search A/C formation, 120; single A/C, 72. Many reports on hand indicating this gear can track A/C at long ranges, up to 150 mi. Bearing accuracy 10° or less. No interceptions prior to 1944, but now reported in all areas occupied by Japan and wide future use is expected. This may be Army equipment. Mk II 165-180 May be sine wave 500 w Fixed ground A/C warning Single A/C, 90. Transmitter & receiver separated & A/C detected when flying through area. Possibly similar to "Hitch-hiker" or doppler system. "B" 30 Surface search No details known and no interceptions reported.
| Designation | Frequency mc. | PRF | Pulse length microsec | Peak power output | Installation | Use | Maximum range (1) (miles) | Performance | Type antenna and polarization | Receiver | Remarks |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Mk II Model I | 190-210 | 500 possibly maintained by tuning fork. | 5 Kw. modifications probably are of higher power. | All types ships, except SS. | A/C and surface search; surface fire control and may be used for AA fire control. Efficiency obtained in such multipurpose role is questionable. | A/C formation, 90; BB and CA, 42-64 CL, 15.6 DD, 9. Approximately the same as for Mk I Model II. With antenna may be slightly altered. | Accuracy: Against A/C: Range ±1,000 M. bearing ±5° elevation angle also given. | Probably as shown for Type 2 below. | This is evidently the Japanese principal shipborne radar and is mass produced in some of its modifications. It is reported to be identical to Mk I Model II, and probably has been modified only in such detail as was necessary to adapt it to ship Installation. Specifications of Mk I Model II, with exception of antenna system, apply to Mk II Model I. Tested in March-April 1942. | ||
| Type 2 | 5 Kw | As for Mk II Model I. | Usually a single T & R antenna, four-stack, four half-wave long, using argonne gas discharge tube as duplexing device. Auto rotation. | Power supply 220 V, 3 phase, 50-60 C. This is probably first of MK II Model I, accepted in spring of 1942. Modification I, II, and III are known to exist. | |||||||
| Mk II Model II | Approximately 3000. Estimates from captured documents indicate 2857-3125. Magnetron frequencies of 3006 and 3092 and freq. range of 0.1-0.2% by tuning may be possible. | 2500 | 6 | 2 Kw | All types ships, except SS. | Surface search reported ineffective against A/C, but research underway to modify for A/C search. | Not effective against A/C maximum 6 to 9. BB, 21; CV, 17; CL,12. DD, 11; SS surfaced, 8; trimmed, 4. | Accuracy: Range, ±1.6%; bearing, 2.4°. Another source indicates accuracy of 500 M. in range and 3°-4° in bearing. Maximum range 62 mi. | Single dipole mounted in magnetic horn fed by wave guide. Two identical horns for T & R. Polarization varies from II. to V. as azimuth changes by 90°. Estimated absolute gain of 80, high side lobes, 12% at 26°. | Uses magnetron M60. Probably same as Modification 11. | Captured documents Indicate first tested with BB's in spring of 1942. Ranges obtained 22 ml. of 60 built in 1942, only 5 or 6 operated satisfactorily. Synchronisation and indicator units differ from lower frequency only in detail. Transmitter uses 4-ring. water-cooled magnetron, types M311 or M312. Modification 1 known to exist, but details and quantity unknown. Modification II probably is principal production set. |
| Modification II | As for Mk II Model II, 2% to 4% timing may be possible. | 2500 but probably variable up to 6000. | 6 at base; may be as short as 4.5 at top. Possibly variable 2-10. | 2 Kw. but possibly more as efforts have been made to increase power. | All types ships, except SS. | Surface search. Some evidence that Mk II Model II is being used for fire control. | Warning range same as for Mk II Model II. Fire control range about half. | Estimated accuracy: Range, ±100 yds; bearing ±0.5°. | Transmitting as for Mk II Model II. Has automatic rotation equipment. Receiving antenna uses two horns to obtain null at 0°. Gain on either principal lobe 130. Side lobes at 17°. | Regenerative, using M60 magnetron, band with 30 Mc. No provision to prevent overloading by CW jamming. No provision for tuning and transmitter is probably tuned to receiver. | Principal, and possibly the only major change, is antenna system. Considerable evidence exists that many difficulties are being experienced with Japanese 10 cm radar, but extensive research is under way to improve its performance and power. Its use for A/C search and fire control is expected, although at present indications are that Mk II, Model I and the Mk IV series are the equipments in general use for fire control, and in greater production. |
| Modification III | As for Modification II | 600 | As for Modification II. | 2 Kw | Submarines | Unknown but probably comparable to other Mk II Model II. Documents indicate ranges up to 4 mi. | As for Modification II | As for Modification II | Differ from Modification II only in powder supply of 500 cycles, and PRF. Documents refer to "Types 222, 223 and 224" and state "224 is improved model." | ||
| Mk II Model III | 517.. Reference to "50 cm" is found in documents and freq. may extend over considerable band in modifications or other similar sets. | 30 | 2 Kw | Shipborne | Designed for surface search but evidently effective against A/C. | Large A/C at 3300', 34. Surface vessel, 10. | Probably paraboloid | Double superhet. IF1 2.5 Mc, 1 Mc band. IF212.75 Mc, 0.75 Mc. band. | Tested at gunnery school Dec 1943. Probably not in operational use but it is known that intensive research is under way. Probably designed after German Würzburg known to have been shipped to Japan. | ||
| MK II Model IV | No Information. Thought to be in experimental stages. |
JAP RADAR NOMENCLATURE -- NAVAL
Mark I, Land based air-warning.
Mark II, Shipborne A and S warning (sometimes developed into fire control).
Mark III, "Special" air-warning similar to allied "Hitch-hiker."
Mark IV, Land based or shipborne AA, SL or surface fire control.
Mark V, Unknown, probably non-existent.
Air Mark VI, Airborne, ASV (possibly including AI and BB).
Model, Distinguishes various equipments in the same MARK category.
May differ radically or be very similar.
Type, Thought to indicate only year of manufacture or design.
Modification, Technically superficial change from
original but may alter complete mission of set as from ASV to fire control.
Change of function may also mean change of MARK Number.
"S", No reliable information.
May be equivalent of MODEL number.JAP RADAR NOMENCLATURE -- ARMY
No comprehensive listing possible.
"A", Alarm radar (air-warning?).
"B", Alarm radar (air-warning?).
Mark VI, Models 1-4 "Target designator" -- probably fire control.
Probable Army Types: Mk 220, Mk 231, Mk TA Model 2
(possibly popular name for Mk VI Mod. 2), CHI (possibly popular name for 229 or 231).
AIRBORNE* RADAR
*It is possible that the Japanese have recently undertaken a program for the installation of the Air Mk. VI radar operating on 150 mc incertain surface vessels.
Designation Frequency mc. PRF Pulse length microsec. Peak power output Installation Use Maximum range (miles) Performance Type antenna and polarization Receiver Remarks Mk. VI Model III 145 A/C Probably similar to Mk. VI, Model IV series. Captured Saipan. Installed in "Hamp." First knowledge of radar in single motored Jap A/C. Similar to Type III, Mk. VI Model IV. Mk. VI, Model IV. Type III. 150. Dial marked at 145 and 147 on captured unit. 1000 3-5 5 Kw A/C ASV, AI Range land 90; BB 50; DD 30; A/C 30. Reported Betty installation at 3000 ft. effective field of vision forward 15° or better, depending on target and range: broadside to target 20-35° depending on target and range. Various. Two dipoles on each side fuselage near empennage and on leading edge each wing. Pictures show array on fuselage near nose, possibly Yagi type. 11 tube superhet. IF 10 Mc., bandwidth 300 Kc. to half power points. Sensitivity 2-3 microvolts. Two stages RF, four IF. Receiver and presentation unit captured Hollandia, manufactured Dec. 1943. Power supply: motor generator operates on 12 V., delivers 100 V., 95 C AC to power pack which provides 8000 V. for plate, 500 for grid. Transmitter uses two U-233 in push-pull. Total weight 220 lb. Some Mk. VI may be used in ground stations, though designed for A/C. "U" equipment CM A/C ASV, blind bombing against land targets. Probably similar to compromised Allied H2S radar. It is known Japan has received details of H2S from Germany. Not defined 517 A/C Being developed as of Oct. 1943. Referred to as FD-1 for small A/C and as FD-2 for night fighters. Not defined 545 5 Kw A/C Being developed as of Oct. 1943. Referred to as FD-1. See Mk. IV series for fire control 545 Mc. Not defined 1200 2000 3 1-2 Kw Night fighter AI Will give much higher definition than other types. Quarter-Wave mounted under A/C & A ground plane rotatable reflector probably in nose. Superhet In development. Radar abbreviations:
PRF -- Pulse repeating frequency.
ASV -- Air to surface vessels.
AI -- Air intercept radar used by night fighters.
Dipole -- Half wave antenna.FIRE CONTROL AND SLC RADAR
Designation Frequency mc. PRF Pulse length microsec. Peak power output Installation Use Performance Type antenna and polarization Receiver Remarks Mk. IV Model I 200 30 Kw Ground AA fire control Rated: Maximum range 30 mi Mattress: T, four elements, four lines. R, four elements, four lines and 2 elements, six lines. Large model. Not in mass production and probably not in use in great quantity. Antenna probably mounted on building and entire structure rotates. Mk. IV Model II 200 1000 3 Ground AA fire control As for Mk. IV Model I As for Mk. IV Model I Superhet., IF 10 Mc.; band width 1.5 Mc.; has auto gain control. 2 stages RF, 6 IF. Manual gain control in 1st and 2nd IF cathodes; AVC in 1st, 2nd, 3rd IF grids. Small model, designed for mass production. Probably improvement over Mk. IV Model I. Modification II Power doubled Better than Mk. IV Model II Uses cavity oscillator. Presentation improved, providing greater accuracy. Signal/noise ratio improved. Design under way February 1944; probably in production shortly thereafter. Mk. IV Model III 200 2000 3-5 or 10 15 Kw Ground transportable. Ships. AA and surface fire control, SLC. Rated: Maximum range 25 mi.; effective tracking 12 mi. Accuracy: Range 55 yds.; bearing ±1° above 15°, ±3° below 15°. For SLC, four Yagi mounted on SL, lobe switched at 25 per second. Uses target discriminator circuit for tracking individual target in group. Designed from captured British SLC radar. Lightweight and easily transportable. Used with type 96 (110 cm) SL, and a Model I SL was designed in December 1942, apparently specifically for radar control. Mk. IV Model III Modif. I. 200 1000 3 20 Kw SLC Lobe switched-25 CPS Captured Saipan. Not defined 545 Fire control Being developed as of 1943. Details unknown. See Mk. VI Series for airborne 545 Mc. TA Model I 200 5 Kw TA Model II 200 1000 2 5 Kw Ground AA Fire control and possible SLC. Measures range, height & bearing. Range scope calibrated 0-150 and 0-20 KM, the latter for better accuracy. Range accuracy 100M or less. 4 radiators with reflectors, lobe-switched at 24 per sec. Probably vertically polarised. Superhet. 12 Mc. 2 IF. No. RF Appears to be similar to Mk. IV Series and may be Army adaptation. Undoubtedly a copy of British SLC equipment captured by Japs. TA Model III 75 3 or less probable. 50 Kw May be confused with the 70 Mc. family of MK. CHI air warning radars. Probably a copy of British GL Mk. 2 TA Model IV 187-214 50 Kw
SONAR EQUIPMENT
Listening equipment Designation Installations Transducer Frequency Scan Presentation Performance Manufacturer Remarks Principal source of information Model K, hydrophone Submarines 3 granular carbon hydrophones. Sonic Electrical phasing; binaural reception using hydrophones in pairs. Submarine Signal Co. -- U.S. A. Same in principle and construction as the model KE suspended hydrophone. Same as K-tube of Navy during World War I. Printed chart recovered from I-1. Model KE suspended hydrophone. Small defense vessels; can be installed on any ship. 3 granular carbon hydrophones at vertices of equilateral triangle of 4 ft. sides. Sonic Electrical phasing; binaural reception using hydrophones in pairs. Headphones Own ship at rest: Submerged sub. Reliable range yds.) YOKOSUKA Navy Yard (?). Suspended over side at 25-37 ft. depth: used only when vessel is stopped. Easy to install and maintain. Adopted 1933. Printed chart recovered from I-1; also report of tests - JICPOA 7715. 3 kts 1,000 5 kts 1,500 12 kts yard craft 3,000 Average bearing error: 10 degrees. Supersensitive suspended hydrophone. 15 granular carbon hydrophones grouped on circle of diameter 4.8 ft. Sonic -- high pass filter attachment cuts off at 700 cycles. Suspended over side at 35-65 ft. depth. Suspending gear same as in model KE suspended hydrophone. New development; may not be operational. Captured Manual -- JICPOA 3765. Suspended type hydrophone for use on PT boats. PT's 4 misc. phone detectors set up in form of a square; permanent-magnet type, movable coil. Mounted on cross shaped frame with diagonal length of 19.7". Headphones Submerged sub Reliable range yds.) Of maximum sensitivity type, small, compact, light in wt., especially designed for small craft. Bearing accuracy poor. Detectors mounted in fulcrum with universal couplings to eliminate shocks. Suspended over side by means of special device. Max. depth about 16'. Captured Manual JICPOA 7867. 2 kts 880 3 kts 1,100 4 kts 1,650 Surfaced sub. 2 kts 1,100 3 kts 1,430 Japanese Note: This table for Type 1 coastal use hydrophone is practically the same for this instrument. Model MV, hydrophone Surface ships; submarines (?). 12 hydrophones -- 6 In linear array on each side of ship; granular carbon on model 1. Moving coil magnetophones on model 2. About 750-1200 cycles, depending on installation. Electrical phasing; both binaural and "maximum sensitivity" reception. Headphones Bearing accuracy of 1°-3°for target on beam of own ship. Accuracy poor for target bearing within 20° of own bow or stern. Subject to confusion from target sounds reflected off sea's surface and bottom. Submarine Signal Co., U.S.A. ATLAS WERKE, Germany. Similar to JL gear of U.S. Navy. Printed chart recovered from I-1 Type TAMOTSU (HO), hydrophone. Surface ships (?); submarines. 16 hydrophones. Original model had moving coil magnetophones. Revision 1 had permanent magnet moving coil phones. 300-1,500 cycles on original model. Electrical phasing; "maximum sensitivity" reception. Headphones At times superior to type 93 hydrophone. Average range on fast DD with original model 3,000-4,000 meters. German Electro-Acoustic Co. Hydrophones are probably in circle of 1-2 meters diameter. Printed chart recovered from I-1 Type 93, hydrophone Small naval vessels and submarines. 16 moving coil hydrophones in elliptical array about 10 ft. by 5 ft. On subs microphones are of excitation type. 550-1700 cycles. Probably incorporates filters. Electrical phasing: "maximum sensitivity" reception. Models A and 1A have bearing repeaters. Own ship: Submerged sub. Reliable Range (yds.) Difficult to identify source of sound. Adopted 1935. Printed chart recovered from I-1. 0 kts 3 kts 1,000 0 kts 5 kts 2,000 6 kts 3 kts 500 6 kts 5 kts 1,000 8 kts 3 kts 8 kts 5 kts 500 Average bearing error 5°. Reception performance best off the beams; worst astern. Underwater signalling equipment "PERIPHONE," double-purpose under-water signal apparatus. Submarines. Modification on surface vessels. Electromagnetic. Original models have 3 units; improved models have 8 units. Arranged in retractable "sword." Maximum signal range 10,000 yds; maximum range for voice transmission 6,500 yds. Little affected by speed or depth. Signal directivity 10° at 10,000 yds; 40° at 4,000 yds. Listening range, 4,000 yds on 12 kt. ship. 2°-5° bearing accuracy. German Electro-Acoustic Co. KURE Naval Arsenal. Type 1 has not transmitter; used for listening only. As echo-ranger, claimed range of 1,500-2,300 yds, 5% error. Printed chart recovered from I-1. Type F, underwater signal apparatus. Destroyers and submarines. Submarines have two units, one for transmitting and one for receiving. Destroyers have four units. Submarine Signal Co., U.S.A. Printed chart recovered from I-1.
* Used In defense of important harbors, river mouths, and coastal areas. SONAR EQUIPMENT -- Continued
Echo-ranging equipment Designation Installation Transducer Frequency Scan Presentation Performance Manufacturer Remarks Principal source of information Type 93, echo-ranger Destroyers and defense vessels. Models 1, 2, 3. Submarines -- Model 4. Quartz projector type 3. Mention is also made of projectors type 1 (29 kc), type 2 (25 kc), type 4 (17.5 kc), but the use of these types is not known. 250 watts output to projector. Nominal 17.5 kc; listening frequency variable between 16-31 kc. Range scales 3,000 and 6,000 meters. Variable pulse length 0.01 sec. to 1 sec. Motor training. Bearing Indicator. Range indicator. Audio indication on 1,050 cycles. Average bearing error 5°. Average range error 50 yds. Beam width about 27°. YOKOSUKA Navy Yard and TOKYO Electric Co. Principal echo-ranging equipment. Filter width 1.4 kc. Adopted 1937. Captured manuals -- JICPOA 6375, 6562, and 5551. Own speed: Reliable echo range 6 2,500 10 2,000 12 1,500 14 1,000 Type 91, echo-ranger Some surface ships and submarines. Nominal 17.5 kc (7) For the most part same as type 93 in principle, but is markedly inferior to type 93. Being replaced. May have auxiliary fathometer projector. Captured manual -- JICPOA 6376. Small model echo-ranger Small vessels Angular magneto-striction. Two faces; each face 9.6 cm x 19.0 cm. 14 kc Range scale 1.000 meters. Manual training from bridge. Headphones and chemical recorder (starch and potassium iodide). 1,000 yds. Estimated 50° beam width. Capacitative discharge driver. Captured manuals -- JICPOA 6375 and 3765. Moored listening equipment Type 92 HydrophoneModel 1 Ocean bottom along shore 3 Microphone detectors Installed on mount in retaining gear. Addendum to CINCPAC-POA. Weekly Intell, Vol. 1, No. 4. Type 92 Hydrophone Model 2 Deep sea areas or where Model 1 cannot be used. 3 Microphone detectors installed in retainers and held at set depth (100'-130') in a fixed direction and in a horizontal position by mooring equipment. Often used in connection with type 92 mines in defense of important harbors to verify sonic information as to course, speed and position of vessels picked up by microphone detectors on the mines themselves. The hydrophones are moored to seaward of the mines. Addendum to CINCPAC-POA. Weekly Intell., Vol. 1, No. 4. Type 97 Hydrophone Reported to be moored in depths as great as 492'. Including 100' of cable, total wt. of mount is said to be as much as 3,660 lbs. Also used in connection with type 92 mines. Addendum to CINCPAC-POA. Weekly Intell., Vol. 1. No. 4. NOTE -- It is not determined to what extent this equipment may be used by naval forces. FIXED COMMUNICATIONS EQUIPMENT
Japanese designation Frequency range Type of circuit Power output Type of emission Transmitter tuning Receiver type Sensitivity Selectivity Image rejection ratio Receiver tuning Type 92 Mk 3 long wave trans. (Rev. 1) 0.1-1.0 Mc Hartley Oscill 1 Kw CW 4 controls Type 95 short ware transmitter 3.7-8 Mc Crystal Oscill. or MO followed by 4 stages. 1 Kw CW 7 controls Type 95 Mk. 4 short wave trans. (Rev. 1) 3.7-18.2 Mc Crystal Oscill. or MO followed by 4 stages. 500 Watts CW 5 controls Type 92 short wave monitor (Rev. 2) 1.3-3.1 Mc Heterodyne Band switch and 2 knobs. Type 92 wireless receiver (Rev. 1) 20 Kc-20 Mc TRF low freq. Superhet, high. TRF 110 Mv Superhet. 8 Mv. TRF 18 Kc at 6 db down; Superhet. 12 Kc. 850 to 1 4 Controls. Type 92 wireless receiver (Rev. 4) 20 Kc-20 Mc TRF low freq. Superhet. high. TRF 110 Mv Superhet. 8 Mv. TRF 16 Kc at 6 db down; Superhet. 12 Kc. 850 to 1 4 Controls.
Japanese designation Tubes Power source Size Weight Use Range Transportation Remarks Type 92 Mk. 3 long wave trans. (Rev. 1) (1) SN146 Separate 2.5 Kw supply 46" X 29 1/2" x 22" 300 lbs Fixed Station 500-12,000 miles Non-portable Electrical design poor thruout. No apparent use of weather or fungus proofing. Type 95 short ware transmitter (1) 202A, (1) D865, (1) UV814, (1) 0812, (1) SN148. Separate 2.5 Kw supply 53 1/2" x 41 1/2" x 28 1/4" 1,000 lbs Fixed Station 500-12,000 miles Non-portable Very large. Appears well constructed. 1st amplifier is grid keyed. Type 95 Mk. 4 abort wave trans. (Rev. 1). (1) 202A, (1) D865, (1) UV814, (1) D860, (1) UV861. Separate 2.5 Kw supply 58 1/2" x 29 3/4" x 25 3/4" 800 lbs Fixed Station 300-12,000 miles Well constructed. Good electrical design. Type 92 short wave monitor (Rev. 2) (4) UY37A, (1) UZ76, (1) UZ78 18" x 10 1/2" x 10" 40 lbs Probable use to set transmitter on freq. Non-portable Crystal oscillator for calibration. Believed gear could be used for search receiver. Type 92 wireless receiver (Rev. 3) (4) UZ78, (1) UT6A7, (1) UZ77, (1) UY238. 26 1/4" 13 1/4" x 10" 102 lbs Stationary Nets Non-portable Non-portable 7-tube combination TRF and superheterodyne Intended for field station operation. Obsolete design difficult to tune. Extremely wide frequency range but 25 coils necessary to operate over entire band. Type 92 wireless receiver (Rev. 4) (4) UZ78, (1) UT6A7, (1) UZ77, (1) UY238. 26 1/4" x 13 1/4" X 10" 120 lbs Stationary Nets Appears same as Rev. 3 with exception of 1 or 2 controls on front panel.
AIRBORNE COMMUNICATIONS EQUIPMENT
Japanese designation Frequency range (Mc.) Type of circuit Power output Type of mission Transmitter tuning Antenna Receiver type Sensitivity Selectivity Image rejection ratio Receiver radiation Receiver tuning Type 1 aircraft Mk. 3 wireless set 30-45 Crystal oscillator 5 watts MCW and voice Aircraft, fixed Superheterodyne Type 3 aircraft Mk. 1 wireless set. 5-10 MOPA; Crystal controlled or self-excited. 75 watt CW, 25 watt phone. CW, MCW and voice. Two controls Aircraft, fixed Superheterodyne .8-3.8 Mv 14.7 kc at 6 db down MCW; 20.8 for CW. One control. Type 96 aircraft Mk. 1 wireless set. 3.8-5.8 Crystal oscillator 8 watts CW and voice Aircraft, fixed Superheterodyne Experimentally manufactured short wave wireless set. 7.6-10.6 Crystal oscillator 27 watts CW, 9 watts phone. CW, MCW and voice. Four controls Aircraft, fixed Superheterodyne 13 Mv 19 kc at 6 db down. 22 db at 7.6 Mc to 35 at 8.8 Mc. One control. Type 96 aircraft Mk. 3 wireless set. 0.3-0.5 and 5-10. Crystal oscillator 75 watts or 8 watts CW Two switches and 1 knob on front panel. Regular, fixed 32ft. Superhet. with regenerative detector. Low freq. 17.5 to 245 Mv; high 3.5-1300. 2 to 10 kc at 6 db down. 2 milliwatts. Two controls front panel. Type 96 aircraft Mk. 4 wireless set (Rev. 2) 0.3-0.5, 5-10, 10-15. Crystal oscillator 175 watts (approx.) CW and voice Aircraft, fixed TRF on long wave superhet. on short. Type 98 aircraft Mk. 4 wireless set. 29.5-52.5 Crystal oscillator 12 watts MCW and voice Aircraft, fixed Superheterodyne Type 99 aircraft Mk. 3 wireless set. 1.5-6.7 Crystal oscillator 6 watts CW, MCW and voice Two controls Aircraft, fixed Superheterodyne 4.6 Mv 20 kc at 6 db down. 62.6 at 6 db down Three controls. Type 99 aircraft Mk. 4 wireless set. 44-50 Crystal oscillator 12 watts Voice Three controls Aircraft, fixed Superheterodyne Four controls.
Japanese designation. Tubes Power source Size Weight Use Range Transportation Remarks Type 1 aircraft Mk. 3 wireless set (4) 6 V 6, (2) 6 K 7, (2) 6 J 7 Vibrator 10" X 6" X 6" 25 lbs. Command set 50 miles at 10,000 feet Aircraft-Zeke, Oscar, Hamp Well constructed. Compact. No weatherproofing or fungus protection. Type 3 aircraft Mk. 1 wireless set "A" or "B" in modulator and receiver, FB325A and FZ064A in transmitter. Dynamotor 17 1/2" x 8 1/2" x 7 3/4" 70 lbs. Air-ground liaison & command set. 100 miles at 10,000 ft. for CW; under 50 mi. for phone. Aircraft-Dinah, Betty, Liz Mechanical and electrical design excellent. No weatherprooflng or fungus protection. Type 96 aircraft Mk. 1 wireless set (2) UX47A, (2) UX134, (1) UY133A, (1) UX109, (1) UZ135. Dynamotor 14 3/4" x 10 5/8" x 9 1/8" 38 lbs. Command set 50 miles at 10,000 ft Aircraft-Zeke, Oscar, Hamp Little known about this set. Experimentally manufactured short wave wireless set. (2) UZ510, (2) UZ6D6, (1) UT6L7G, (3) UY76, (1) UT6B7, (1) UZ41. Dynamotor 16 3/4" x 13" x 10 5/8" 41 1/4 trans. & receiver. 82 lbs. complete. Air-ground liaison 40 miles at 10,000 ft Aircraft-Val, Lily, Dinah, Judy. Modification Type 96 Mk. 2. Type 96 aircraft Mk. 3 wireless set Trans.: (1) 816, (1) 865, (1) UX47A; Rec.: (2) UY36A, (5) UY37A, (1) UY39A. Dynamotor & vibrapack. Trans.: 15" x 13" x 8"; Rec: 15" X 10" X 8". 40 lbs. Air-ground and command set. Low power: 50 mi. at 10,000 ft. High power: 200 mi. at 10,000 ft. Aircraft-Betty, Jake, Kate All circuits simple. Receiver change of frequency difficult under flight conditions. Type 96 aircraft Mk. 4 wireless set (Rev. 2) (1) UX49C, (1) UY56B, (1) UV816D, (2) UY36A, (4) UY37A, (1) UY39A. Vibrator & dynamotor. 98 lbs. Air-ground liaison 200 miles at 10,000 ft. Aircraft-Betty, Val Crystals for 5777.5 & 6850 & 8845 kc captured in few of this type. Type 98 aircraft Mk. 4 wireless set (2) UX807A, (1) UX907, (1) 6K7, (1) 6A8, (1) 6J7, (1) 6B8, (1) 6V6. Dynamotor 30 lbs. Air-ground liaison 75 miles at 10,000 ft Aircraft-Nell, Betty Oscillator plate circuit of trans. tuned to 4th harmonic crystal freq., then doubled in final amplifier plate circuit. Type 99 aircraft Mk. 3 wireless set (2) UX807A, (4) 6F7 Dynamotor 40 lbs. Command set 70 miles at 10,000 ft Alrcraft-Oscar Mk. 1 & 2, Tony. Control box, antenna loading coil, voltage regulator make complete set. Type 99 aircraft Mk. 4 wireless set (3) UX807, (4) UX6F7 15" x 7 3/4" x 8 3/5" 25 lbs. Air-ground liaison 80 miles at 10,000 ft Aircraft-Lily, Betty Cons. & elect. design good. NAVIGATIONAL AIDS
Airborne Fixed Field Jap Designation Type 1 Aircraft Mk. 3 Radio Homing and Direction Finder. Unknown Type 93 Short Distance, Short Wave Direction Finder (Rev. 1). Type 94 model 1 portable direction finder. Frequency Range 0.17-0.46 Mc 0.45-1.2 Mc 2.2-25.7 Mc 0.1-2.0 Mc. Type Superheterodyne Superheterodyne TRF followed by regenerative detector. Presentation Aural and Visual Aural Aural. Sensitivity 11 Microvolts 2.2-12.8 Microvolts. Selectivity 12 Kc. at 6 db down 3.8-8.8 Kc. at 6 db down. Tuning One control Six controls 8 adjustments on front panel. Antenna Single rotatable loop with sense antenna Dipole in corner reflector plus keyed parasitic dipole Adcock array 8' loop and 30' sense antenna. Tubes (2) 6V6, (4) 6J7, (6) 6K7 (3) 807 (2) P213 (3) UY36A, (2) UY37A, (1) UY38A, (4) UY39A All UY 38A, and total of 6. Spot Frequency 60 Mc Type Circuit Crystal Ocillator Power Output 100 Watts Modulation AM at 3 optional frequencies, 450, 720 or 1150 cps Power Source 220 volt 3-phase AC contained in unit Size 18" x 9 1/2" x 6" 19 5/8" x 15 1/2" x 13 5/8" 32" x 20" x 10" Weight 15 lbs 100 lbs 211 lbs. Use Direction finding and homing Guide ships into port Locating planes Direction finding on land stations and planes. Range Approx. 100 mi Transportation Aircraft -- ZEKE and probably others Fixed station Fixed station Mobile. Remarks Identical with design of FAIRCHILD AERIAL CAMERA CO. Apparent use in fighter aircraft to direct to rendezvous with enemy planes. Uses lobe switched beam. When on course constant tone heard. Construction and design very poor. Receiver located in a small house with dipoles at each corner of structure. Fair design. Shielding between stages good. Rather good mechanical construction. Electrical design good; large number of tuning controls. No weather protection.