 Hornet flat four air-cooled engine, but trials during the summer of 1930 suggested a different powerplant.As a result, the second Redwing flew with an 80 hp (60 kW) Armstrong Siddeley Genet IIA five cylinder radial, becoming known as the Redwing II.The next eight aircraft were also built as Redwing IIs, but the last two produced began as Redwing IIIs.