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ART Projects by GSA Contract SIN #

SIN 871-3 System Design, Engineering and Integration

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SIN 871-4 Test and Evaluation

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Project 3: Design and Analysis of a Compound Helicopter for High Speed Flight

Summary of Services Performed: Use ART modeling and analysis tools RCAS and FLIGHTLAB to design and simulate a compound helicopter that uses a variable speed rotor for efficient autorotative lift in high speed forward flight

ART was awarded a subcontract to support the design and analysis of a compound helicopter named Heliplane. The configuration used a rotor with tip-jets to fly as a helicopter in hover and low speed forward flight and as a fixed-wing aircraft with the rotor in auto-rotative mode in high speed (up to 400 mph). In such a configuration, the rotor would experience an advance ratio of up to 2.7. ART created two models for this configuration: one in RCAS for engineering analysis and the other in FLIGHTLAB for flight dynamic analysis. Since the trim for this compound helicopter was not unique, ART developed a new trim algorithm for the entire flight envelope. In addition, a preliminary RPM control system was designed and implemented for the high advance ratio auto-rotative condition.