A flight investigation of a lightweight teetering-rotor helicopter was conducted to explore the limitations encountered in power-off flight with the collective pitch stick held in the trim level-flight position. The results indicate that with the collective pitch stick fixed in the trim level-flight position, autorotation is possible under selected conditions with attendant gains in helicopter performance. Aircraft vibrations limited successful use of this technique to airspeeds between 25 and 80 knots.
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