Memoirs of An Aeronautical Engineer Flight Testing At Ames Research Center 19
Memoirs of An Aeronautical Engineer Flight Testing At Ames Research Center 19
Seth B Anderson
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In addition, enlarging the area of the horizontal tail would extend the usable airspeed range. Still to be resolved was an aeroelastic low-frequency rotor/pylon oscillation similar to a propeller whirl flutter mode in cruise flight. After an extensive analysis program aided by computer studies, the aircraft entered the 40- by 80-foot tunnel (in May 1 966) for the fourth and last time. At maximum tunnel speed and at the last data point planned, a wing-tip-fatigue failure resulted in both rotors ...being torn off, thus ending the XV-3's test career. A Lift Fan System Another example of a V/STOL aircraft which received special development attention at Ames was the XV-5 fan-in-wing _P_ concept (fig. 87). In 1 958 the General Electric Company introduced the idea of tip-driven lift fans for VTOL operation. The U. S. Army awarded a contract in 1961 toG. E. And the Ryan Company to build two demon- strator aircraft using the lift-fan concept. The Ryan XV-5, which first flew in July 1964, was a two-place, 0.
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