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Troubling story and some questions
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December 31st 07, 04:23 PM posted to rec.aviation.soaring
ZL
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Posts: 51
Troubling story and some questions
wrote:
On Dec 31, 8:26 am, wrote:
On Dec 31, 6:10 am, "Byron Covey" wrote:
"Chris Rollings" wrote in message
...
Flutter speed (the normal cause of the break-up you
are concerned about) varies with altitude but not so
much as does the IAS.
Are you certain? Isn't aero flutter a function of true airspeed?
My understanding has always been that the reason Vne drops with
altitude is that flutter is a TAS phenomenon.
9B
True sort of. I think what Chris is referring to is that it
apparently is not a simple direct relationship. Hard core wave pilots
and some aerodynamic experts can tell you why. It's a fairly esoteric
area. Each machine has different flutter characteristics, loading
varies... It really gets weird above 40k but even at 18k you can have
a bad day pushing the limits.
Matt Michael
You might try googling Aeroelasticity. Several 800+ page academic text
books come up, each with extensive discussion of flutter. Not a simple
topic.
-Dave Leonard
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