Thanks to Joseph & John for the explanation. On Sat, Oct 24, 2009 at 11:21 AM, John Sessoms <[email protected]> wrote: > Cavitation - there's a pressure drop at the trailing edge of the blade most > noticable near the tip. > > If the air has enough moisture water vapor condenses there and is blown aft > by the forward motion of the aircraft. > > Since the blade tips are rotating, the condensation blowing aft takes on a > spiral form.
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