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Mitsubishi was the first and largest series producer of Japanese engines during World War II, with a 1937 Pratt & Whitney arrangement possibly contributing to this success. The Kasei (Mars) was the largest of the manufacturer’s original 14-cylinder radials, and was widely used in various models. It was geared, supercharged, and had optional water methanol injection. Between 1941 and 1945, 9,323 engines of all models of the Kasei 20 series were manufactured.

This Model 21 powered the Mitsubishi G4M twin engine attack bomber (Allied Code Name Betty) built in larger numbers than any other Japanese bomber; it was used from the beginning of the war and also transported the Japanese surrender delegation. A total of 2,446 G4M and the similar G6M1 aircraft were built.

 Display Status

This object is not on display at the National Air and Space Museum. It is either on loan or in storage.
Object Details
Date Circa World War II Country of Origin Japan Type PROPULSION-Reciprocating & Rotary Manufacturer Mitsubishi Jukogyo K. K.
 Physical Description Type: Reciprocating, 14 cylinders, 2 rows, radial, geared, supercharged, optional water methanol injection, air cooled Power rating: 1,361 kW (1,825 hp) at 2,600 rpm Displacement: 42.1 L (2,570 cu in.) Bore and Stroke: 150 mm (5.91 in.) x 170 mm (6.69 in.) Weight: 750 kg (1,654 lb) Dimensions Other: 175.3 × 134cm (69 × 52 3/4 in.)
Storage: 213.4 × 153 × 154.9cm (84 × 60 1/4 × 61 in.)
3-D (Weight on stand): 1009.7kg (2226lb.)
Length 175.3 cm (69 in.), Diameter 134 cm (52.75 in.)
 Materials Non-magnetic metal
Magnesium
Aluminum
Steel
Stainless Steel
Leather
Plastic
Adhesive
Rubber
Synthetic Fabric
Paper
 Inventory Number A19670116000 Credit Line Transferred from Wright-Patterson AFB, Ohio Data Source National Air and Space Museum Restrictions & Rights Usage conditions apply
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