B1M file photo [13879]


ManufacturerMitsubishi Heavy Industries
Primary RoleTorpedo Bomber


ww2dbaseThe B1M biplane torpedo bombers were employed by the Japanese Navy as the Navy Type 13 Carrier-borne Attack Aircraft. Within Mitsubishi, the various variants of the B1M design were also known as 2MT1 (B1M1), 2MT2 (B1M1), 2MT3 (B1M1), 3MT1 (B1M2), and 3MT2 (B1M3). British aircraft engineer Herbert Smith played a key role in the design's development. They first took flight in 1923 and entered service in 1924. In 1929, a number of surplus B1M aircraft, modified with enclosed cabins, were sold into the civilian market with new designation T-1.2. 32 B1M torpedo bombers participated in the First Battle of Shanghai in 1932 as members of the air groups aboard carrier Kaga and Hosho. A small number of them were also used by the Japanese Army under the designation Army Type 87 Light Bomber. A total of 443 B1M aircraft were built by Mitsubishi and the Hiro Naval Arsenal in Kure, Japan.

ww2dbaseSource: Wikipedia

Last Major Revision: Jan 2012


MachineryOne Napier Lion 12-cyl broad arrow engine rated at 500hp
Armament2x7.7mm forward machine guns, 2x7.7mm rear flexible machine guns, 1x18in torpedo or 2x250kg bombs
Span14.77 m
Length9.77 m
Height3.50 m
Wing Area59.00 m²
Weight, Empty1,442 kg
Weight, Maximum2,697 kg
Speed, Maximum210 km/h
Service Ceiling4,500 m


B1M torpedo bomber at rest, circa 1920sCarrier Kaga during training off Japan, 1930; note B1M Type 13 aircraft on upper deck and A1N Type 3 aircraft on lower deckKaga underway during air operations training, Japan, 1930; note B1M Type 13 and A1N Type 3 aircraft on flight deckCarrier Akagi off Osaka, Japan with B1M and B2M aircraft on board, 15 Oct 1934
See all 5 photographs of B1M Torpedo Bomber

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B1M Torpedo Bomber Photo Gallery
B1M torpedo bomber at rest, circa 1920s
See all 5 photographs of B1M Torpedo Bomber

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