Bell X-22.
The Bell X-22, is an American V/STOL Xplane, with four tilting ducted fans. Take-off was to selectively occur, either with the propellers tilted vertically upwards, or on a short runway with the nacelles tilted forward, at approximately 45°. Additionally, the X-22 was to provide more insight into the tactical application, of vertical take-off troop transporters such as, the preceding Hiller X-18 and the X-22's successor, the Bell XV-15. Another program requirement, was a true airspeed in level flight of at least 525 km/h (326 mph; 283 knots). In 1962, the United States Navy announced their request for, two prototype aircraft with V/STOL capability, powered by four ducted fan nacelles. Bell Helicopters already had extensive experience with VTOL aircraft, and was able to utilize an already developed test mock-up. In 1964, the prototype, internally referred to by Bell as Model D2127, was ordered by the Navy and received the X-22 designation. It was unveiled at an event in Niagara Falls in May 1965. Three-bladed propellers were mounted on four wings, and synchronized through a wave-interconnection system, were connected to four gas turbines which, in turn, were mounted in pairs on the rear wings. The maiden......
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