Vought Ground Effects and Transition Tests of a Tandem Fan Medium Speed V/STOL Configuration 831547

Vought has participated with the Navy and NASA in studies of various subsonic and supersonic V/STOL aircraft. From these studies, a unique propulsion concept, the Tandem Fan, has been developed. A. 11 scale subsonic V/STOL Tandem Fan model has recently been tested in Vought's large ground effects facility (LGEFF) and Vought's 7 × 10 ft low speed wind tunnel.
The Vought large ground effects facility, provides V/STOL testing at hover in the presence of 0 to 30 knots winds in a free circulation environment. The Tandem Fan tests in this facility consisted of over 100 runs to evaluate both attitude and control effects. Individual fan thrust modulation was tested to evaluate pitch and roll control effectiveness, and exhaust nozzle perturbations were tested for yaw control.
The model was then installed in the Vought 7 × 10 ft. low speed wind tunnel to evaluate the cruise and upper transition flight regions.


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