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A dumb doubt on stalls



 
 
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Old June 21st 06, 01:52 PM posted to rec.aviation.piloting
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Default A dumb doubt on stalls

"Jim Macklin" wrote
[...] If the wing stalled, the center of
pressure would not be creating a moment arm to drop the
nose, the tail must loose lift (stall) to cause the stall
break which causes the recovery from the approaching stall.


The stall break occurs when the wings have already stalled, not when merely
approaching a stall. When the wings stall and then abruptly produce less
lift, the plane's flight path abruptly turns downward. The plane then
weathervanes into the relative wind, thus pitching downward.

It's true that the weathervaning itself can be explained in terms of a
reduction of (downward) lift from the elevator. However, contrary to your
explanation, the reduction of lift is not due to the tail stalling, but
rather just the opposite: the change in relative wind moves the tail's angle
of attack *away from* the (negative) critical angle (rather than toward it,
as would be necessary to stall). And also contrary to your explanation, it's
the stall (of the wings) that causes the tail to lose some lift
(because the relative wind changes), rather than vice versa.

http://www.faa.gov/library/manuals/a...83-25-1of4.pdf

You keep referencing this 111 page document, but you don't
reference where in it you found what you mention above.


I did not reference or even read the FAA Handbook when I
posted my answer. [...]
I referenced the [FAA Handbook] only to allow those who
asked the question to find a reference.


Ok, but if you'd read the book that you referenced but didn't reference,
you'd have seen that it doesn't say what you thought it said.

--Gary


 




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