The VAK 191B used two Rolls-Royce/MTU RB.162-81 lift engines (6,000 lb thrust each), one mounted directly behind the cockpit and one aft of the wing, plus a MTU/Rolls-Royce RB.193-12 vectored thrust turbofan engine (10,163 lb thrust) mounted between them. The RB.193 was a scaled down version of the Roll Royce Pegasus engine used on the Kestrel/Harrier. First untethered hovering flight of the German/Italian VAK 191B was conducted on 10 September 1971, with first transition achieved on 26 October 1972. The program was intended to develop a high-speed V/STOL strike aircraft; but it was canceled due to a change in NATO strategy. The US Navy subsequently funded additional V/STOL oriented flight tests.

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