Investigation of the Stabilator on the S-67 Aircraft
UNITED TECHNOLOGIES CORP STRATFORD CT SIKORSKY AIRCRAFT DIV
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A flight test and simulation investigation of the S-67 stabilator was conducted. The S-67 stabilator, an all-movable, in-flight-trimmable horizontal stabilizer, is coupled to the longitudinal cyclic control in forward flight and may be uncoupled to free-float in hover. The flight tests included hover, transitions, low- and high-speed flight, autorotation, and stabilator bias actuator hardovers. In the simulation study, stabilator design was varied to establish trends due to design changes. The existing stabilator design will provide the aircraft with accepatble trim and static stability for the full G. W. and C. G. envelope. In-flight trimmability provides control of fuselage attitude independent of the rotor.