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Old 07-09-2009, 12:52 AM   #33 (permalink)
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After all this, academic material and all, I'm still not totally sure if a heli that is not traveling forward, but is instead dropping out of the sky with boom at 90 degrees, at perfectly zero pitch along the blades, generates any ongoing lift..

my guess from what has been said so far: with no motor, lift diminishes quickly to zero as rpm diminishes to zero
with motor maintaining constant RPM, lift is generated in proportion to downward velocity (which is why you don't get light on the skids at zero pitch) so some equilibrium speed is reached..

if so, one can reach the strange conclusion that a heli will fall slower powered at 2 degrees negative pitch than with stopped blades.
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