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A main objective of the STOL and Maneuver Technology Demonstrator, (S/MTD) Program was to evaluate the operability and performance of its unique engine/nozzle configuration which can deliver thrust in three different modes; conventional, vectored and through variable vanes which give the option of going from forward to reverse thrust. The two-dimensional nozzle and the modified engine were extensively tested during sea level and altitude testing to satisfy all flight clearance requirements. This paper concentrates on the flight test results of the various modes of vectoring and reversing ending with a compilation of the actual usage of the propulsive controls that could be used by designers of similar advanced propulsion systems.

The STOL and Maneuver Technology Demonstrator Program is designing and developing, through tests, simulations and analyses, a new aircraft and propulsion control system that not only better utilizes aerodynamic controls, but also incorporates the propulsive forces of vectoring and reversing, plus braking and steering on landing roll out. The new concepts being developed, which include an integrated flight and nozzle control with a two-dimensional nozzle, will be validated through a series of flights exploring takeoff and landing techniques along with cruise and maneuvering flight. Results of this program are being used to transition these concepts into future fighter systems.