The Ki-61-I-KAI-Hei was the definitive production version of the Hien with the Ha-40 version of the DB 601A.

The Ki-60 represented one of the first Japanese attempts to produce a dedicated interceptor fighter.

The Ki-60 represented one of the first Japanese attempts to produce a dedicated interceptor fighter.

Опытный Ки-45
The first prototype Ki-45

The Ki-45-KAI-Hei, the last example of which was completed in July 1945.

The Ki-45 in its original form, prior to the "Phase I Performance Improvement Programme".

The Ki-45-KAI-Hei, the last example of which was completed in July 1945.

The Ki-28 was discarded in favour of the competitive Nakajima Ki-27 which offered superior manoeuvrability.

The Ki-28 was discarded in favour of the competitive Nakajima Ki-27 which offered superior manoeuvrability.