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s_thatcher(at)bellsouth.n
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 Posted: Mon Dec 24, 2007 4:21 am Post subject: Wing or Flap or Aileron Flutter (Scott Thatcher) |
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I want to thank those who have contributed both their thoughts and knowledge
regarding this problem. The suggestions regarding recovery from Paul
Mulwitz, Tony Graziano and Bob Archibald were excellent.
Although I have not heard from the person who experienced the flutter or
large amplitude vibrations here in Lantana last week, I do have some
thoughts regarding this problem.
It appears there may be many factors involved when this problem hits. Here
are a few items to keep in mind if you want to avoid this potential problem.
1. Always stay within the aircraft's specified CG envelope.
2. Always do a thorough pre-flight to discover any loose or wobbly control
surfaces. This can sometimes induce flutter in the control surfaces and
sometimes cause a harmonic vibrational instability to the wing or loss of
the control surface itself.
3. Visually inspect the wing surface and note any indications of "smoking
rivets." .This is a condition involving loose rivets that vibrate in
position leaving a black ring around them or a small trail of residue in
their wake. The main reason for concern here is that the torsional strength
of the structure may be compromised should enough of these rivets start to
fail. And if torsional strength is lost, a flutter of the wing is a good
possibility during some conditions. Flutter would be exhibited through
severe up and down motions of the trailing edge of the wing in which normal
damping of the wing structure would be absent.
4. If you are startled out of your mind when a severe oscillation of the
wing occurs (either from flutter or some form of harminic vibration in which
the tip of the wing starts to gain and lose amplitude), do not make rapid
changes in control surfaces. The explanation by Bob Archibald is an
excellent exmple of what procedures may be done to stop the flutter, both in
slowing down and speeding up
5. Don't assume that because people say this is a non-issue and that the
wing of the 601 is very stiff that, under the right conditions, you wouldn't
also have your family reading about "pilot error" in the newspaper.
If others have some input, please let us know. In the meantime, I'm going
flying as soon as possible in my newly registered 601XL, N601EL.
Scott Thatcher, Palm Beach Gardens, FL
601XL with Corvair, Still 99% complete but Registered as E-LSA
N601EL
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purplemoon99(at)bellsouth
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| Posted: Mon Dec 24, 2007 10:33 am Post subject: Wing or Flap or Aileron Flutter (Scott Thatcher) |
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Scott,when you get flying you are invited to fly to Ft. Pierce to the EAA.
908 breakfast the third sat.of each mo . Break fast is on me for any 601
or 701 and there passanger. Joe N101HD 601XL/RAM
---
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ashontz
Joined: 27 Dec 2006
Posts: 723
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| Posted: Thu Jan 03, 2008 4:16 am Post subject: Re: Wing or Flap or Aileron Flutter (Scott Thatcher) |
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Here's an interesting idea, how about mounting a laser light inside the wing that shoots from the wing root near the front on the wing down to the front outboard tip of the wing through the lightening holes to a 45 degree mirror (turning the laser light 90 degrees) which then points to some sort of sensor at the back of the outboard tip of the wing. I'm sure someone here is smart enough to figure out how to do this and knows what I'm getting at enough to make some sense out of the data in flight.
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