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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. However, it proved unable to produce enough thrust for vertical flight, even with an installed engine delivering more thrust than its empty weight, and the project was abandoned. ==Design and development== thumb In 1972, the Navy issued a request for proposals for a next generation supersonic V/STOL fighter/attack aircraft. The XFV-12A, despite its concept being considered risky compared to that of the Harrier, was selected for development.〔(【引用サイトリンク】title=GlobalSecurity.org )〕 To reduce costs, the nose from a Douglas A-4 Skyhawk and intakes from the F-4 were used.〔 Engine rig testing began in 1974.〔 Free-flight model tests conducted at the NASA Langley full-scale wind tunnel showed the projected thrust augmentation levels were highly optimistic, and that the aircraft would most likely be incapable of vertical flight on the thrust available.〔 However, the model's configuration did prove suited for conventional flight.〔 The XFV-12 used a thrust augmented wing concept〔(【引用サイトリンク】title=Historic Aircraft by Airborne Unlimited )〕 in which exhaust would be directed through spaces in a wing opened up like venetian blinds to increase available lift, somewhat like Lockheed's unsuccessful XV-4 Hummingbird. Such arrangement restricted weapons carriage to under the narrow fuselage and two conformal missile mounts. Its canards were extremely large, with almost 50% of the area of the wings, making it effectively a tandem wing. The 30,000 lbf (130 kN)-class afterburning turbofan engine had enough thrust to lift the weight of the 20,000 lb (9,072 kg) aircraft. It was modified to further increase thrust for vertical lift. The rear engine exhaust was closed and the gases redirected through ducts to ejector nozzles in the wings and canards for vertical lift. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Rockwell XFV-12」の詳細全文を読む スポンサード リンク
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