Ken-Royce 5 Cylinder Radial
The Ken-Royce engines are small 5 and 7 cylinder radials of between 70 and 120 horsepower, depending on the model. Ken-Royce engines are most commonly seen on Rearwin aircraft, but Ken-Royce engines, and their predecessor line, the LeBlond engines, also powered some other light planes of the 30s. By the end of the 1930s it was obvious that the day of the small radial had passed, replaced by smaller, cheaper, less complicated horizontally opposed "flat" 4 cylinder engines.
Production of Ken-Royce engines was halted during WWII and never resumed, as the engine was not economical as compared to newer flat engines. Ken-Royce engine parts were serviced during the 1950s by Air Associates, and in the 1960s the remaining parts stock was sold to the Antique Aircraft Association in Blakesburg, Iowa. There are a few parts left in Iowa, but mostly what's left at Blakesburg are engine drawings.
Canadian Aviation Blog