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This Japanese engine incorporated fuel injection, fan cooling, and turbo-supercharging. Mitsubishi began development in 1941, and 16 engines were known to have been built during World War II. The engine powered several prototype aircraft including the: Mitsubishi Ki-83 Army Experimental Long-range Fighter; Tachikawa Ki-70 Army Experimental Command Reconnaissance Plane(Allied Code Name Clara); Tachikawa Ki-74 Army Experimental Long Range Bomber(Allied Code Name Patsy); Mitsubishi A7M3-J Navy Experimental 17-Shi Ko (A) Type Carrier Fighter Reppu (Allied Code Name Sam). None became operational, and the engines, which were not fully developed, proved unreliable during flight tests.

The Tachikawa Ki-70 was intended as a reconnaissance aircraft, but its performance fell below that of advanced versions of its predecessor, being overweight and the Ha-211 engine being unreliable. The Tachikawa Ki-74 was to be capable of bombing the United States mainland. However, the unreliable Ha-211 engines suffered from development problems, and the war ended before replacement engines could be tested.

 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, 18 cylinders, 2 rows, radial, air-cooled, turbosupercharged Power rating: 1,641 kW (2,200 hp) at 2,900 rpm Displacement: 41.7 L (2,546 cu in.) Bore and Stroke: 140 mm (5.5 in.) x 150 mm (5.9 in.) Weight: 980 kg (2,161 lb) Dimensions 3-D: 200.7 × 128.9cm, 444.5kg (6 ft. 7 in. × 4 ft. 2 3/4 in., 980lb.)
 Materials Non-Magnetic Metal (Possibly Aluminum)
Ferrous Alloy
Paint
Unidentified Coating
Plastic
Paper
Tape
Copper Wire
 Inventory Number A19670082000 Credit Line Transferred from the U.S. Army Air Forces Data Source National Air and Space Museum Restrictions & Rights Usage conditions apply
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