The XF-11 was an all-metal monoplane with tricycle landing gear. The propellers were of the constant speed, full feathering, reversible-pitch type. An injection type carburetor, and two single stage single speed turbo-superchargers were installed on each engine.Įach engine powered a set of Hamilton-Standard eight-blade, counter-rotating, superhydromatic propellers. Seven magnetos were mounted on each engine to furnish the ignition. The cylinders were arranged in four radial rows of seven cylinders in each row. The XF-11 was powered by two Pratt & Whitney R-4360-31 radial air-cooled, 28 cylinder engines. The 67-foot-long airplane had a maximum takeoff gross weight of 58,300 pounds and a 101-foot wingspan. The relief pilot also performed the duty of photographer. The crew of two including a pilot and a relief-pilot/navigator could change places during flight. The Hughes XF-11 was a prototype for a two-seat, twin-engine reconnaissance airplane with a relatively small, pressurized, central crew compartment and twin tails on long, slender booms.
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