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B4Y “Jean”, Japanese Carrier Torpedo Bomber


Photograph of B4Y "Jean"

U.S. Navy. Via Francillon (1979)


Yokosuka B4Y "Jean"


Specifications:


Crew 3
Dimensions 33'3" by 49'3" by 14'3"
15m by 10.15m by 4.36m
Wing area 538 square feet
50 square meters
Weight 4408-7937 lbs
2000-3600 kg
Speed 173 mph
278 km/h
Climb rate 47.4 feet per second
14.4 m/s
Service ceiling       19,685 feet
6000 m
Power plant 1 700 hp (522 kW) Nakajima Hikari 2 nine-cylinder radial engine driving a two-bladed propeller
Armament 1 flexible 7.7mm Type 92 machine gun in rear of cockpit
External stores
1 1760-lb (800 kg) torpedo or 1 1100 lb (500 kg) bomb
Range 970 miles
1560 km
Fuel 183 gallons
693 liters
Production A total of 205 aircraft by 1938, mostly at Mitsubishi - Nagoya.

"Jean" was a Japanese biplane torpedo bomber in the same class as the British Swordfish. Designed by Kawasaki Sanae to meet a 1934 requirement, it used the efficient wings of the E7K1 "Alf" and the prototype first flew ino late 1935. Production began in November 1936 and the aircraft remained part of the air groups of Japanese carriers until 1940, seeing service over China.

The U.S. Navy expected that the Japanese would be flying this sort of obsolete aircraft off of their carriers when war broke out, but  "Jean" had already been relegated to training units, and was probably never encountered by the Western Allies in combat.


References

Francillon (1979)



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