Kellett K-2
 The Kellett K-2 was a two-seat autogiro developed in the United States in the early 1930s. Later examples were designated K-3 and K-4 when equipped with more powerful engines. In design it was similar to the Cierva and Pitcairn autogiros of the day; an airplane-like fuselage with a nose-mounted engine surmounted by a rotor mast. Also like some of Cierva's designs the K-2 featured stubby fixed wings for additional lift and as a mount for ailerons for lateral control.