Mitsubishi Ha 43 Model 11 (Ha 211 Ru), Radial 18 Engine

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)

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.