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Japan's Imperial Navy flag

Japan's Yokosuka B4Y, Nakajima Type 96, K-96 torpedo bomber
Allied Code Name: Jean

Photos

  • Nakajima Type 96 torepedo bomber
  • Nakajima Type 96 torepedo bomber

Design

The Imperial Japanese Navy in 1934 decided to replace the poorly performing Navy Type 92 Carrier Attack Bomber, B3Y1. A 9-Shi specification was given to Mitsubishi, Nakajima, and the Dai-Ichi Kaigun Koku Gijitsusho (1st Naval Air Technical Arsenal). Sanae Kawasaki led up the design group for the Arsenal where his design tried to use existing components and engines.

Prototype

The first B4Y1 prototype had a Hiro Type 91 (600 HP) liquid cooled engine. The second and third prototypes had the Nakajima Kotobuki 3 (640 HP) radial engine. The fourth and fifth prototypes had the Nakajima Hikari 2 (840 HP) radial engine. In testing the fourth and fifth prototypes performed the best.

Production orders were placed in November 1936.

Production

  • Prototypes: 5
    • Manufacturer: Dai-Ichi Kaigun Koku Gijitsusho at Yokosuka
    • Production: 1935 - 1936
  • Yokosuka B4Y1:
    • Manufacturer:
      • Nakajima Hikoki K.K.: 37 (1937 - 1938)
      • Mitsubishi Jukogyo K.K. at Nagoya: 135 (1937 - 1938)
      • Dai-Juichi Kaigun Kokusho at Hiro: 28 (1938)

Variants

  • Yokosuka B4Y, Navy Type 96 Carrier Attack Bomber:

Usage

Units

Training

Before late 1941 the B4Ys were moved to training duties.

Specifications

  Nakajima Type 96-1, K-96
Type Torpedo bomber
Engine (Type) 1: Kotobuki
Cylinders Radial
Cooling Air
Net HP 600
Propeller blades 2
Dimensions  
Span 49' 5"
Length 38' 7"
Weight  
Loaded 7,300 lb
Performance  
Speed 168 mph
Range with torpedo 145 miles
Armament 1: MG
  B4Y1
Type Carrier Based Torpedo Bomber
Crew Pilot, Radio Operator, Navigator
Engine (Type) Nakajima Kotobuki 3
Cylinders Radial 9
Cooling Air
Net HP 840
Propeller blades 2
Dimensions  
Span 49' 2 9/16"
15 m
Length 33' 3 19/32"
10.15 m
Height 14' 3 21/32"
4.36 m
Wing area 538.194 sq ft
50 sq m
Weight  
Empty 4,409 lb
2,000 kg
Loaded 7,937 lb
3,600 kg
Performance  
Speed 173 mph
150 knots
Climb to 9,845' / 3,000 m 14 minutes
Service ceiling 19,685'
6,000 m
Range 978 statute miles
850 nautical miles
Armament  
Cockpit - Rear 1: 7.7 mm Type 92
Torpedo 1: 1,764 lb
1: 800 kg
OR  
Bombs 1,102 lb
500 kg

Sources:

  1. Aeronautics Aircraft Spotters' Handbook, Ensign L. C. Guthman, 1943
  2. Japanese Aircraft of the Pacific War, René J Francillon, 1970
20th Century American Military History Crucial Site