Mitsubishi B1M

The Mitsubishi B1M was a Japanese torpedo bomber of the 1920s, also known as the Navy Type 13 Carrier-Borne Attack Aircraft.

It was designed and built by Mitsubishi and used in combat against China.

The aircraft was used by the air services of the Imperial Japanese Navy and Imperial Japanese Army.

Variants

Navy long formal designations

Navy Type 13-1 Carrier Attack Aircraft

B1M1

Navy Type 13-2 Carrier Attack Aircraft

B1M2

Navy Type 13-3 Carrier Attack Aircraft

B1M3

Navy short designations

B1M1

Initial two seat production version powered by 450 hp (340 kW) Napier Lion engine. . 197 built by Mitsubishi.

B1M2

Three-seat production torpedo bomber, based on 2MT5, powered by Mitsubishi Hi V-12 engine. 115 built by Mitsubishi.

B1M3

Improved B1M2 with revised propeller and reduction gear.

128 built by Mitsubishi and Hiro Naval Arsenal.

Company designations

2MT1

Navy Type 13-1 Carrier Attack Aircraft / B1M1

2MT2

Navy Type 13-1 Carrier Attack Aircraft / B1M1

2MT3

Navy Type 13-1 Carrier Attack Aircraft / B1M1

2MT4

Experimental reconnaissance seaplane version.

One built.

2MT5

Prototype of the B1M2 / Navy Type 13-2 Carrier Attack Aircraft, two-seat torpedo bomber powered by 450 hp (340 kW) Mitsubishi Hi V-12 engine

(licensed built Hispano-Suiza Lb).

One built.

3MT1

Navy Type 13-2 Carrier Attack Aircraft / B1M2

3MT2

Navy Type 13-3 Carrier Attack Aircraft / B1M3

Army designations

Mitsubishi Army Type 87 Light Bomber

Mitsubishi B1Ms used by the IJAAS .

Specifications

Crew

2

Length

9.77 m (32 ft 1 in)

Wingspan

14.77 m (48 ft 5 in)

Height

3.5 m (11 ft 6 in)

Wing area

59 m2 (640 sq ft)

Empty weight

1,442 kg (3,179 lb)

Max take-off weight

2,697 kg (5,946 lb)

Powerplant

1 × Napier Lion W-12 water-cooled piston engine, 370 kW (500 hp)

Propellers

2-bladed fixed-pitch propeller

Performance

Maximum speed

210 km/h (130 mph, 110 kn)

Endurance

2.6 hours

Service ceiling

4,500 m (14,800 ft)

Wing loading

45.7 kg/m2 (9.4 lb/sq ft)

Power/mass

0.14 kW/kg (0.085 hp/lb)

Armament

Guns

2 × fixed, forward-firing 7.7 mm machine guns

&

2 × pivoted 7.7 mm machine guns in rear cockpit

Bombs

1 × 18-inch torpedo or 2 × 240 kg (529 lb) bombs.

 

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