A new high-horsepower narrow profile engine was required for the Kawasaki Ki-64 experimental fighter.
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When the AE1P design was accepted, Aichi's version became the Atsuta 32 and Kawasaki's version became the Ha-40, which was to be used in IJAAS's Kawasaki Ki-61 Hien (Allied reporting name "Tony") fighter.
On 27 September 1943, the base and settlement were attacked by 21 Japanese Kawasaki Ki-48 bombers, based at Kupang, Timor, with a fighter escort.
Armament consisted of two 7.7 mm (.303 in) Type 89 machine guns, synchronized to fire through the propeller.
Takeo Doi the future chief designer for Kawasaki, worked as Vogt's assistant on the project; Vogt later went on to become chief designer for Blohm & Voss.