In the early 1930s Dean Hammond designed the Hammond Model Y, a low-wing monoplane twin-boom pusher monoplane.[1] Hammond cooperated with the aircraft designer Lloyd Stearman to develop the type for production.[1] They formed the Stearman-Hammond Aircraft Corporation in 1936 to build the aircraft as the Stearman-Hammond Y-1.[1] The first aircraft was powered by a 125 hp (93 kW) Menasco C-4 piston engine driving a pusher propeller.[1] The performance was not impressive so it was re-engined with a 150 hp (112 kW) Menasco C-4S and re-designated the Y-1S.[1] Although designed to be easy to fly the high price meant only 20 aircraft were produced.[1]