The Rolls-Royce Buzzard (also referred to as the H engine) was a British piston aero engine of 36.7 litres (2,240 cubic inch) capacity that produced about 800 horsepower (600 kW). Designed and built by Rolls-Royce Limited it featured 12 cylinders in a 'V' configuration of 6 inch bore and 6.6 inch stroke. It was manufactured in the late 1920s, but only 100 were sold.