In Japan, most airplanes were powered by air-cooled radial engines such like 14-cylinder Mitsubishi Zuisei (11,903 units, e.g. Kawasaki Ki-45), Mitsubishi Kinsei (12,228 units, e.g. Aichi D3A), Mitsubishi Kasei (16,486 units, e.g. Kawanishi H8K), Nakajima Sakae (30,233 units, e.g. Mitsubishi A6M) and 18-cylinder Nakajima Homare (9,089 units, e.g. Nakajima Ki-84). Kawasaki Ki-61 and Yokosuka D4Y were rare example of Japanese liquid-cooled inline engine aircraft at that time but later, they also redesigned to fit radial engines as Kawasaki Ki-100 and Yokosuka D4Y3.