|First flight||28 December 1929|
|Primary user||Imperial Japanese Navy|
|Developed from||Blackburn Ripon|
The Mitsubishi B2M was a Japanese carrier-based torpedo bomber of the 1920s and 1930s. It was built by Mitsubishi to a design by Blackburn Aircraft of Britain and was operated by the Imperial Japanese Navy.
Design and development
In 1927, the Japanese company Mitsubishi commissioned the British aircraft manufacturer Blackburn Aircraft to design an aircraft, which would be built under licence by Mitsubishi if successful, to enter a competition held by the Imperial Japanese Navy for a carrier-based reconnaissance and torpedo bomber to replace its B1M. Blackburn developed a design, the Blackburn T.7B, which was an enlarged development of their Ripon, which was under development for Britain's Fleet Air Arm. The T.7B was a three-seat biplane of steel tube construction and with high aspect ratio wings fitted with Handley Page slats, powered by a 466 kW (625 hp) Hispano-Suiza 12Lbr engine.
The design was declared the winner of the competition, with a prototype (referred to as the 3MR4) being ordered from Blackburn. This first flew on 28 December 1929 at Blackburn's factory at Brough, Yorkshire, and was shipped to Japan in February 1930.
Three development prototypes were built by Mitsubishi in Japan before the aircraft was adopted as the Navy Type 89-1 Model 1 Carrier Attack Plane or Mitsubishi B2M1.
The B2M1 entered service with the Imperial Japanese Navy in March 1932, serving aboard the carriers Akagi, Kaga and Hōshō. Modifications to improve maintainability resulted in the B2M2 or Navy Type 89-2 Carrier Attack Plane, which otherwise showed little improvement in performance over the B2M1. Production of both versions totalled 204 aircraft.
- Blackburn T.7B
- Prototype aircraft built by Blackburn Aircraft.
- Mitsubishi 3MR4
- Three Japanese-built prototypes.
- Mitsubishi B2M1
- Initial production aircraft.
- Mitsubishi B2M2
- Improved production variant with reduced wingspan and modified tail.
Data from World Encyclopedia of Military Aircraft
- Crew: 3
- Length: 10.27 m (33 ft 8 in)
- Wingspan: 15.22 m (49 ft 11 in)
- Height: 3.71 m (12 ft 2 in)
- Wing area: 55 m2 (590 sq ft) 
- Empty weight: 22,670 kg (49,979 lb) 
- Gross weight: 3,600 kg (7,937 lb)
- Powerplant: 1 × Hispano-Suiza 12Lbr V-12 water-cooled piston engine, 485 kW (650 hp)
- Maximum speed: 213 km/h (132 mph, 115 kn)
- Range: 1,779 km (1,105 mi, 961 nmi) 
- Service ceiling: 4,500 m (14,800 ft)
- Guns: 1 × forward firing 7.7 mm (.303 in) machine gun and 1 × flexible 7.7 mm (.303 in) machine gun in rear cockpit
- Bombs: 1 × 800 kg (1,764 lb) torpedo or equivalent weight of bombs
Aircraft of comparable role, configuration, and era
- Mason, Francis K (1994). The British Bomber since 1914. London: Putnam Aeronautical Books. ISBN 0-85177-861-5.
- Angelucci, Enzo (1981). World Encyclopedia of Military Aircraft. London: Jane's Publishing. ISBN 0-7106-0148-4.
- Donald, David (Editor) (1997). The Encyclopedia of World Aircraft. Aerospace Publishing. ISBN 1-85605-375-X.CS1 maint: extra text: authors list (link)
- "Håkans Aviation page – Sino-Japanese Air War 1937". Retrieved 25 June 2007.
- Mikesh, Robert C; Abe, Shorzoe (1990). Japanese Aircraft 1910-1941. London: Putnam Aeronautical Books. pp. 167–168. ISBN 0-85177-840-2.
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