Specifications (XF-12)General characteristics

Length: 93 ft 9 in (RC-2 version 98 ft 9 in) (28.56 m)
Wingspan: 129 ft 2 in (RC-2 version 129 ft 2 in) (39.37 m)
Height: 28 ft 1 in (RC-2 version 29 ft 11 in) (8.55 m)
Wing area: 1,640 ft² (RC-2 version 1,640 ft²) (152.36 m²)
Empty weight: 65,000 lb (RC-2 version 67,000 lb) (29,483 kg)
Loaded weight: 101,400 lb (RC-2 version 114,200 lb) (45,994 kg)
Max takeoff weight: 101,400 lb (RC-2 version 114,200 lb) (45,994 kg)
Powerplant: 4 × Pratt & Whitney R-4360-31 Radial engine, 3,250 hp (2,423 kW each) each
Performance

Maximum speed: 470+ mph (RC-2 version 450 mph) (756 km/h)
Range: 4,500 miles (RC-2 version 4,100 miles) (7,242 km)
Service ceiling: 45,000 ft (RC-2 version 40,000 ft) (13,716 m)
Rate of climb: 5,000+ ft/min (RC-2 version 5,000+ ft/min) (1,524 m/min)
Wing loading: 61.83lb/ft² (301.9 kg/m²)
Power/mass: hp/lb (kW/kg)