CONTINENTAL W670-6N ENGINE
7-cylinder, 4-stroke radial Continental engines was defined as R-670 in military use, and renamed as W670 in civilian use. It was produced by Continental Motors Company before and during World War II. It is known to be used in the Boeing Stearman PT-17, the primary training aircraft operated by the American army and navy. The engine has 220 horsepower and weighs 479 lbs (218 kg).