It was powered by two 450 horsepower ( 340 kW ) Pratt & Whitney R-985 Wasp Junior nine-cylinder , air-cooled , radial engines mounted on the leading edges of the wings .
It was an all-metal , high-winged monoplane powered by two 450 horsepower ( 340 kW ) Pratt & Whitney R-985 Wasp Jr. nine-cylinder , air-cooled radial engines mounted on the leading edge of high-set wings .