This US seven cylinder radial was first run in 1934, and remained in production for 40 years.

It offered between 200 and 350 hp in its various versions, with a typical weight of 465 lbs.

It proved to be a rugged and reliable engine for trainers and light transports. It was best known locally for powering the ”Ansons” and Cessna “Cranes” of the British Commonwealth Air Training Plan.