Abstract
Wind-tunnel evaluations of two pneumatic thrust-deflecting powered-lift systems have been conducted to develop the capabilities of interchangeab le thrust recovery and reversal as well as longitudinal pitch trim. A circulation control wing/vectored thrust configuration employed underwing Pegasus-type nozzles to redirect the horizontal thrust component as needed for STOL operation and to provide nose-up pitching moment for trim. Although they provided a vertical thrust component to lift, the vectoring nozzles were relatively ineffective in augmenting aerodynamic lift. A circulation control wing/over the wing blowing configuration pneumatically deflected engine thrust for additional high lift beyond that provided by CCW alone. It also allowed pneumatic conversion of the resultant force along the flight path from thrust recovery to thrust reversal as required for takeoff or approach. Both configurations thus offer possible solutions to STOL operational problems, one by pneumatic/mechanical means and the other primarily pneumatically.
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