Designed by Lee Bowman, the 1929 Dawn Aircraft Motors Inc Duplex was a five-cylinder, air-cooled radial, copy of the French Gobron-Brille with two pistons in each cylinder head.
Designed by Lee Bowman, the 1929 Dawn Aircraft Motors Inc Duplex was a five-cylinder, air-cooled radial, copy of the French Gobron-Brille with two pistons in each cylinder head.