 Constructed mainly of wood, it was a high-wing cantilever monoplane with a two-step hull and single fin and rudder.The prototype, which was an amphibian with a retractable wheeled undercarriage which swung forward into streamlined casings in the leading edges of the wings, was powered by two Wright SGR-1820-F Cyclone nine-cylinder air-cooled radial engines mounted above the wing, each driving a tractor propeller.It was followed by 11 production aircraft, which were all pure flying boats.