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Performance of the Rotor Systems Research Aircraft Calibrated Rotor‐Load‐Measurement System

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The compound Rotor Systems Research Aircraft (RSRA) is designed to make high‐accuracy, simultaneous measurements of all rotor forces and moments in flight. Physical calibration of the rotor force‐ and moment‐measurement system when installed in the aircraft is required to account for known errors and to ensure that measurement‐system accuracy is traceable to the National Bureau of Standards. The first static calibration and associated analysis have been completed with good results. Hysteresis was a potential cause of static calibration errors, but was found to be negligible in flight. compared to full‐scale loads, and analytical methods have been devised to eliminate hysteresis effects on calibration data. Flight tests confirmed that the calibrated rotor‐load‐measurement system performs as expected in fight and that it can dependably make direct measurements of fuselage vertical drag in hover.

Document Type: Research Article


Affiliations: NASA Ames Research Center, Moffett Field, California

Publication date: 1984-07-01

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  • The Journal of the American Helicopter Society is the world's only scientific journal dedicated to vertical flight technology. It is a peer-reviewed technical journal published quarterly by AHS International and presents innovative papers covering the state-of-the-art in all disciplines of rotorcraft design, research and development. (Please note that AHS members receive significant discounts on articles and subscriptions.)

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