The primary goal for this flight was to find the open-loop flutter speed with a secondary goal of gathering additional 23 m/s open-loop chirp data on surfaces L3/R3 and L4/R4. Following completion of the chirp excitations, a 20 second speed ramp was initiated from 23 m/s to 35 m/s while flying open-loop. The throttle command saturated flying level at 28 m/s with a noticeable wing oscillation, but the oscillation amplitude remained constant. A slight pushover maneuver was initiated to add energy and find the amplitude divergence point, which occurred at 30 m/s. The divergence occurred rapidly enough that recovery was not possible. This flutter speed matches the expected speed, validating our modeling approaches.
Skoll Flight 13.
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