Yokosuka B4Y

The Yokosuka B4Y / Navy Type 96 Carrier Attack Bomber, carrier torpedo bomber was used by the Imperial Japanese Navy Air Service from 1936 to 1943.

The B4Y replaced the Mitsubishi B2M2 and was the last biplane bomber used operationally by the Imperial Japanese Navy.

Variants

First Prototype 

559 kW (750 hp) Hiro Type 91 520 hp water-cooled W-12 driving a two-bladed propeller.

Second and Third Prototypes 

477 kW (640 hp) Nakajima Kotobuki 3 nine-cylinder air-cooled radial driving a two-bladed propeller.

Fourth and Fifth Prototype and Production Aircraft 

636 kW (853 hp) Nakajima Hikari 2 nine-cylinder air-cooled radial driving a two-bladed propeller.

Specifications

Crew

Length

10.15 m (33 ft 4 in)

Wingspan

15 m (49 ft 3 in)

Height

4.36 m (14 ft 4 in)

Wing area

50 m2 (540 sq ft)

Empty weight

2,000 kg (4,409 lb)

Gross weight

3,600 kg (7,937 lb)

Powerplant

1 × Nakajima Hikari 2 9-cylinder air-cooled radial piston engine, 630 kW (840 hp) for take-off

522 kW (700 hp) at 1,200 m (3,937 ft)

Propellers

2-bladed fixed-pitch propeller

Performance

Maximum speed

278 km/h (173 mph, 150 kn)

Range

1,573 km (977 mi, 849 nmi)

Service ceiling

6,000 m (20,000 ft)

Time to altitude

3,000 m (9,843 ft)

Wing loading

72 kg/m2 (15 lb/sq ft)

Power/mass

0.1749 kW/kg (0.1064 hp/lb)

Armament

Guns

1× flexibly mounted, rearward-firing 7.7 mm (0.303 in) Type 92 machine gun

Bombs

1× 800 kg (1,764 lb) torpedo, or 500 kg (1,102 lb) of bombs.

 

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