The Hughes H-4 Hercules was a prototype heavy transport aircraft designed and built by the Hughes Aircraft company. The aircraft made its only flight on November 2, 1947. It was primaraly built from wood because of wartime raw material restrictions on the use of aluminum. The Hercules is the largest flying boat ever built, and has the largest wingspan of any aircraft in history. It survives in good condition at the Evergreen Aviation Museum in McMinnville, Oregon, USA. [Wikipedia]
| Crew | 3 |
| Length | 218 ft 8 in |
| Wingspan | 320 ft 11 in |
| Height | 79 ft 4 in |
| Fuselage height | 30 ft |
| Loaded weight | 400,000 lb |
| Powerplant | Eight Pratt & Whitney R-4360 Wasp Major radial engines, 4,000 hp each |
| Propellers | Four-bladed Hamilton Standard, 1 per engine |
| Propeller diameter | 17 ft 2 in |
| Cruise speed | 250 mph |
| Range | 3,000 mi |
| Service ceiling | 20,900 ft |