S/MTD Thrust Vectoring/Reversing Flight Test Results

This paper briefly describes the initial flight test results from the NF-15B Short Takeoff and Landing/Maneuver Technology Demonstrator (S/MTD) Program. Program objectives and an aircraft description are followed by test results from pitch thrust vectoring, reversing in ground effect, and inflight reversing.

Even though full up hardware has been in flight test only since February 1990, many of the overall program goals have been achieved. Thrust vectoring and reversing using a two dimensional (2D) convergent-divergent exhaust nozzle have been shown to be both possible and practical. An integrated flight and propulsion control system can be used to enhance performance and simplify pilot workload during vectoring and reversing operations.

Future tests of the S/MTD will further quantify performance, assess military utility, and investigate infrared signature changes due to the 2D nozzle in both vectoring and reversing.