C-54/R5D/DC-4: Essentially a slightly larger C-47 (DC-3) with four engines. See below. M. Deporres Like it's stable mate the DC-3/C-47 Skytrain, the C-54 Skymaster was derived from the prototype of a civilian airliner (the DC-4). C-54s began service with the USAAC in 1942, carrying up to 26 passengers. (Later versions carried up to 49 passengers.) The U.S. Navy also acquired the type, under the designation R5D. The C-54/R5D was one of the most commonly used transports by the U.S. armed forces in World War II. Douglas C-54 Skymaster Type: cargo and passenger transport Crew: 6 Armament: none Specifications: Length: 93' 11" (28.63 m) Height: 27' 6.25" (8.39 m) Wingspan: 117' 6" (35.81 m) Wing area: 1463 sq. ft (135.91 sq. m) Empty Weight: 38,000 lb (17,237 kg) Max Weight: 73,000 lb (33,112 kg) max at takeoff Propulsion: No. of Engines: 4 Powerplant: Pratt & Whitney R-2000-7 radial Horsepower: 1350 hp each Performance: Range: 3900 miles (6276 km) Cruise Speed: 239 mph ( 385 km/h) Max Speed: 274 mph ( 441 km/h) at 14,000 ft Ceiling: 22,000 ft (6705 m)