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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
Mitsubishi
and used in combat against China
China
.

CONTENTS

* 1 Development * 2 Operational history

* 3 Variants

* 3.1 Imperial Japanese Navy Air Service (IJNAS) long formal designations * 3.2 Navy short designations * 3.3 Company designations * 3.4 Imperial Japanese Army Air Service
Imperial Japanese Army Air Service
(IJAAS) long formal designations * 3.5 Civilian designations

* 4 Operators * 5 Specifications (2MT2) * 6 See also * 7 References * 8 External links

DEVELOPMENT

While working with the Mitsubishi
Mitsubishi
company, the British aircraft designer Herbert Smith designed the 2MT1 two-seat biplane torpedo bomber which flew for the first time in January 1923 . It went into Japanese Navy service as the TYPE 13-1 CARRIER-BORNE ATTACK AIRCRAFT or B1M1, and was followed by the 2MT2 and 2MT3 variants (also designated B1M1). The redesigned TYPE 13-2 was designated B1M2. The final version, the TYPE 13-3 or B1M3, had the company designation 3MT2 and was a three-seater. Total production was 443. The B1M was powered by a 450 hp (340 kW) Napier Lion
Napier Lion
or Hispano-Suiza engine according to version.

OPERATIONAL HISTORY

The type entered service in 1924 and served into the 1930s, 32 flying from the aircraft carriers Kaga and Hōshō during the Shanghai Incident in 1932. An aircraft from Kaga was lost during an aerial engagement between an American air force adviser and demonstration pilot to the Chinese government, Robert Short, who also lost his life, and regarded as a hero defending the Chinese city against the Japanese aircraft.

From 1929, a number of surplus B1Ms were converted for civilian use, being fitted with an enclosed cabin for passengers or cargo.

VARIANTS

IMPERIAL JAPANESE NAVY AIR SERVICE (IJNAS) 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
Napier Lion
engine. . 197 built by Mitsubishi. B1M2 Three-seat production torpedo bomber, based on 2MT5, powered by Mitsubishi
Mitsubishi
Hi V-12 engine. 115 built by Mitsubishi. B1M3 Improved B1M2 with revised propeller and reduction gear. 128 built by Mitsubishi
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
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

IMPERIAL JAPANESE ARMY AIR SERVICE (IJAAS) LONG FORMAL DESIGNATIONS

Mitsubishi
Mitsubishi
Army Type 87 Light Bomber Mitsubishi
Mitsubishi
B1Ms used by the IJAAS .

CIVILIAN DESIGNATIONS

T-1.2 Converted Aeroplane Civil conversion of B1M. Several variations on type. Enclosed cabin for two or three passengers. Powered by original Lion or Hispano-Suiza engines or converted with licensed built Bristol Jupiter
Bristol Jupiter
radial engine . Also known as TYPE 13TH YEAR CONVERTED AEROPLANE.

OPERATORS

Japan
Japan

* Imperial Japanese Navy

SPECIFICATIONS (2MT2)

Data from The Encyclopedia of World Aircraft

GENERAL CHARACTERISTICS

* CREW: Two * LENGTH: 9.77 m (32 ft 0¾ in) * WINGSPAN : 14.77 m (48 ft 5½ in) * HEIGHT: 3.50 m (11 ft 5¾ in) * WING AREA: 59.0 m² (645 ft²) * EMPTY WEIGHT : 1,442 kg (3,179 lb) * MAX. TAKEOFF WEIGHT : 2,697 kg (5,946 lb) * POWERPLANT : 1 × Napier Lion
Napier Lion
12 cylinder broad arrow engine, 500 hp (370 kW)

PERFORMANCE

* MAXIMUM SPEED : 210 km/h (113 kn, 130 mph) * RANGE : km (nm, mi) * SERVICE CEILING : 4,500 m (14,765 ft) * WING LOADING : 45.7 kg/m² (9.22 lb/ft²)

* POWER/MASS : 0.14 kW/kg (0.084 hp/lb) * ENDURANCE: 2.6 hours

ARMAMENT

* GUNS: 2 × fixed, forward-firing 7.7 mm machine guns and 2 × pivoted 7.7 mm machine guns in rear cockpit * ORDNANCE: 1 × 18-inch torpedo or 2 × 240 kg (529 lb) bombs

SEE ALSO

Related development

* Mitsubishi
Mitsubishi
2MB * Mitsubishi
Mitsubishi
MC-1

Aircraft of comparable role, configuration and era

* Blackburn Dart
Blackburn Dart

Related lists

* List of military aircraft of Japan
Japan
* List of aircraft of the Japanese Navy

REFERENCES

* ^ A B C D Donald, David (Editor) (1997). The Encyclope