The Nakajima Ha1 Kotobuki was an aero-engine developed by Nakajima. It was a radial piston developed under licence from the Bristol Jupiter.

The Yokosuka B4Y was a carrier-borne torpedo bomber used by the Imperial Japanese Navy Air Service from 1936 to 1943. The B4Y replaced the Mitsubishi B2M2 and the Yokosuka B3Y, and was the last biplane bomber used operationally by the Imperial Japanese Navy. The Allied reporting name was "Jean". This aircraft was mistakenly identified by the British as the Nakajima Navy G-96.