The Hitachi Hatsukaze
was a series of aircraft engines built in Japan
prior to and during World War II
. They were air-cooled, four-cylinder, inverted inline engines developing around 82 kW (110 hp).
Hatsukaze engines were produced in very large numbers, since this motor was the powerplant for the licence-built Bücker Bu 131 Jungmann variants that were the standard primary trainers for the Imperial Japanese Navy and Imperial Japanese Army. The naval version of the engine was designated Ha-11, and the army version Ha-47.
The Hatsukaze was also linked to a compressor to create a primitive jet engine, the Tsu-11 intended to power Ohka flying bombs.