Abstract
Development of an airworthiness design standard for light autogyros is underway in an attempt to improve a poor safety record. Mathematical modeling is playing a vital role in the understanding the flight mechanics of these rotorcraft. Unlike helicopters, autogyros have not received the attention of the technical community until recently, and, as a consequence, there is little theoretical analysis or experimental flight testing that makes use of contemporary methods. As a result, validity of mathematical modeling has relied on analysis of flight-test data from experiments conducted with two different aircraft. Parameter estimation by the use of a simple frequency-domain, equation-error approach has proved to yield consistent and robust results from each aircraft, highlighting the same mismatches between theory and experiment in both cases
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