Recent studies have been conducted by Rockwell International and Grumman Aerospace Corps. under contract to NASA Ames Research Center to modify a Grumman Gulfstream II aircraft to a lift-fan transport research aircraft.This paper describes the proposed vehicle and the propulsion/control system to be used for the vertical and transition modes of flight.Criteria for system performance and results of testing on the Ames 6 degrees-of-freedom simulator are described.Advances in lift-fan propulsion technology over the past 10 years are summarized, and typical operational lift-fan vehicles are illustrated.
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