Mitsubishi Zuisei

The Mitsubishi Zuisei, whose name means Holy Star, was a 14-cylinder, supercharged, air-cooled, two-row radial engine used in a variety of early World War II Japanese aircraft. It was one of the smallest 14-cylinder engines in the world and had the smallest diameter of any Japanese engine. While it was an experimental project Mitsubishi called it the A14, in service it was the MK2, the Army knew it as the Ha-26 and Ha-102, the Navy called it Zuisei, and its unified designation code was Ha-31. The MK2A had a 140 millimetre bore and a 130 millimetre stroke for a displacement of 28 litres and a nominal power rating of 805 kW (1,080 hp) at takeoff. Mitsubishi had a custom of naming its engines after objects in the sky, and the Zuisei began that sequence, followed by the Kinsei and the Kasei. Applications included the Mitsubishi F1M, the Kawanishi E7K, the Kawasaki Ki-45 and the Mitsubishi Ki-46.