The Rockwell XFV-12 was a prototype supersonic United States Navy fighter which was built in 1977. The XFV-12 design attempted to combine the Mach 2 speed and AIM-7 Sparrow armament of the McDonnell Douglas F-4 Phantom II in a VTOL (vertical takeoff and landing) fighter for the small Sea Control Ship which was under study at the time. On paper, it looked superior to the subsonic Hawker Siddeley Harrier attack fighter. Ground testing of the XFV-12A began in July 1977, and the aircraft was officially rolled out at the Rockwell International facility in Columbus, Ohio on 26 August. Due to increasing costs, construction of the second prototype was abandoned.
Tethered hover tests were conducted in 1978. Over the course of six months, it was determined that the XFV-12A design suffered from major deficiencies with regard to vertical flight, especially a lack of sufficient vertical thrust.
General characteristics
Crew: 1
Length: 43 ft 11 in (13.39 m)
Wingspan: 28 ft 6.25 in (8.6932 m)
Height: 10 ft 4 in (3.15 m)
Wing area: 293 sq ft (27.2 m2)
Empty weight: 13,800 lb (6,260 kg)
Gross weight: 19,500 lb (8,845 kg)
Max takeoff weight: 24,250 lb (11,000 kg)
Fuel capacity: 2,763 L (730 US gal; 608 imp gal) in two fuselage bladder tanks and two integral wing tanks
Powerplant: 1 × Pratt & Whitney F401-PW-400 afterburning turbofan engine, 30,000 lbf (130 kN) with afterburner
Performance
Maximum speed: Mach 2.2-2.4
Thrust/weight: 1.5 (conventional)
Armament
Guns: 1 20 mm M61 Vulcan cannon, 639 rounds
Missiles: 2 AIM-7 Sparrow (carried under fuselage) and 2 AIM-9L Sidewinder AAMs or 4 AIM-7s















