VFW VAK 191B
The VFW VAK 191B was an experimental German vertical take-off and landing (VTOL) aircraft of the early 1970s.
It was developed as a replacement for the Italian Fiat G.91 with the German Air Force. Operationally, it was intended to have been armed with nuclear weapons, in the event of a major war breaking out, to survive the first wave of attacks by deploying to dispersed locations, rather than conventional airfields, and to retaliate against targets behind enemy lines.
In September 1961, a new German aircraft company, known as VFW, was formed as joint venture between Focke-Wulf and Weser Flugzeugbau, to develop its own VTOL strike aircraft.Fiat was also a participating company in VFW, however, Italy later chose to withdraw from the joint development agreement with Germany during 1967. Despite this decision, Fiat remained as a major sub-contractor for the venture, being responsible for the production of various structural elements such as wings, tailplanes and some of the fuselage.
The VAK 191B was similar to the British Harrier, but with a supersonic dash capability at medium to high altitudes. It was judged that having a single engine would create too much drag, but the two lift engines were dead weight in cruise, and the small cruise engine gave a poor thrust to weight ratio. The VAK 191B had been provided with relatively small and highly loaded wings. By contrast, the Harrier possessed a significantly higher thrust-to-weight ratio, it was effective as a dogfighter, and had larger wings.
VFW's team decided to fit the Rolls-Royce/MAN Turbo RB.193-12 engine to provide both lift and cruise, which was supplemented by a pair of Rolls-Royce vertical lift engines. This arrangement meant during vertical hover, all of the lifting thrust could either be generated by the propulsion engine, or entirely produced by the two lift engines, or a combination thereof; analysis determined that the optimum thrust-generation configuration would be a 50–50 split between both engine types.
During the late 1960s, VFW took the decision to demote the development programme and only to test-fly a limited number of prototypes, using the VAK 191B as a technology demonstrator and experimental aircraft. On 10 September 1971, the first prototype conducted the type's maiden flight. A total of 91 flights were performed ending in 1975.These aircraft have been preserved and two are now on public display in museums.
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