Evaluation of the TRAC Variable Diameter Rotor: Preliminary Design of a Full-Scale Rotor and Parametric Mission Analysis Comparisons
UNITED TECHNOLOGIES CORP STRATFORD CT SIKORSKY AIRCRAFT DIV
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A two-phase analytical investigation was conducted to continue the development and evaluation of the variable-diameter telescoping rotor aircraft TRAC rotor system. The first phase was a preliminary design of a full-scale, flightworthy rotor system suitable for subsequent wind tunnel testing in the NASA-Ames 40-by 80-foot wind tunnel and for flight testing on an H-3 helicopter or the NASAArmy Rotor Systems Research Aircraft RSRA. The second phase of the investigation was a comparative parametric analysis to evaluate TRAC rotor compound helicopter and stowed rotor aircraft concepts relative to conventional- rotor pure and compound helicopters.