Variable-twist rotor blade controlled by hub pitch angle and rotational speed
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United States of America Patent
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Dec 28, 2010
Grant Date -
Jan 21, 2010
app pub date -
May 31, 2007
filing date -
Jun 26, 2006
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The twist distribution of torsionally-flexible rotor blades is adjusted by exploiting centrifugal effect on inertial torquers affixed at one or more stations along the blade span. Twist is thereby made to vary passively as a function of rotor speed and hub incidence angle. With inertias of appropriate size and location, the twist variation is such that high rotor efficiency is maintained over a wide range of operating conditions. Satisfactory dynamic behavior of the blade, including cyclic-pitch response and flutter resistance, is simultaneously achieved.
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