The Kawasaki Ki-84 Hayate was a Japanese single-seat fighter aircraft used extensively by the Imperial Japanese Army Air Force (IJAAF) during World War II. It was known for its speed and its firepower. It was powered by a radial engine and was armed with cannons and machine guns. The Hayate was one of the most capable Japanese fighters of the war, but it was introduced late in the war and its production was limited.