Armament consisted of two 7.7 mm (.303 in) Type 89 machine guns, synchronized to fire through the propeller.
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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.
A new high-horsepower narrow profile engine was required for the Kawasaki Ki-64 experimental fighter.
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.