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"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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