In March 1960 the Curtiss-Wright Corporation developed the X-100, a prototype for a new, vertical takeoff transport aircraft. The X-100 had a single turboshaft engine, which propelled two tilting-propellers, while at the tail swivelling nozzles used the engine's exhaust gases to give additional control for hovering or slow flight. Although sometimes classified as a tiltrotor aircraft, the design differed from the Bell VTOL XV tiltrotor designs. The X-19 utilized specially designed radial lift propellers, rather than helicopter-like rotors, for vertical takeoff and augmenting the lift provided by the wing structures
The first flight of the X-19 took place in November 1963 (other sources give 26 June 1964). It was intended that the X-19 would be developed into a VTOL transport aircraft. However the first X-19 was destroyed in a crash on 25 August 1965, with no loss of life, and the program was subsequently cancelled; the second prototype was never completed. The second X-19 prototype is currently being stored in the restoration facilities at the National Museum of the United States Air Force in Dayton, Ohio.
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The MB-339 was developed during the 1970s in response to an Italian Air Force requirement that sought a replacement for the service's existing fleet of Aermacchi MB-326s.
An Aermacchi MB-339 jet had just taken off in formation to head to Vercelli, where it should have perform an aerial exhibition.
Learn all about the Aermacchi MB-339 with Curator of Aviation Eric Boehm.