Today's Message Index:
----------------------
1. 10:25 AM - Anti Flutter idea.... (Nick Cassara)
2. 11:54 AM - Re: Anti Flutter idea.... (jimbaker@npacc.net)
3. 12:12 PM - Re: Anti Flutter idea.... (b young)
4. 12:27 PM - Re: Anti Flutter idea.... (The Kuffels)
5. 08:53 PM - Re: Anti Flutter idea.... (Richard Pike)
Message 1
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Subject: | Anti Flutter idea.... |
Hello Kolbers,
I had a though about aileron flutter.I have these heavy counter weights that
I will be installing on the outboard ends of my ailerons soon.
Disclaimer. I am a True "amateur" so please tell me why this idea is a bad
one!
If the idea of these weight is to apply resistance to keep the aileron from
fluttering, could this function not also be accomplished by install a
fiberglass rod running along the bottom of the end wing rib, and continuing
out to the end of the aileron. The rod would flex up or done through the
movement on the aileron, but would dampen the aileron movements. Ok, what do
you think? Has this ever been tried..did the pilot live?
Thanks,
Nick Cassara
Palmer, Alaska
Fulltime Amateur!
607AK
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Subject: | Re: Anti Flutter idea.... |
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Subject: | Re: Anti Flutter idea.... |
Nick it is not a resistance,,,, it is a MASS counter balance
a rod from the rib to under the aileron, would increase the working load on
the stick, pilot, linkages,,, and make a somewhat heavy aileron near im
possible to maneuver,,, IMHO in my humble opinion.
boyd
>>>>>>>>>>>>>>>>>>>>>>>>>>>>
If the idea of these weight is to apply resistance to keep the aileron from
fluttering, could this function not also be accomplished by install a
fiberglass rod running along the bottom of the end wing rib, and continuing
out to the end of the aileron. The rod would flex up or done through the
movement on the aileron, but would dampen the aileron movements. Ok, what d
o
you think? Has this ever been tried..did the pilot live?
Thanks,
Nick Cassara
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Subject: | Re: Anti Flutter idea.... |
Nick,
<< fluttering, could this function not also be accomplished by install
a fiberglass rod running along the bottom of the end wing rib, and
continuing out to the end of the aileron. The rod would flex up or done
through the movement on the aileron, but would dampen the aileron
movements >>
I agree with Jim Baker, this is a bad idea. While I'm no expert in
aerodynamics either, I use to do flutter and spin testing so have some
experience with the issues. A simple thought experiment may help
explain why this is a bad idea.
Consider one wing as it goes through a thermal. As the wing enters the
thermal, the trailing edge of the aileron will want to go down, on
leaving the trailing edge will want to go up. With the counterweight,
inertia will resist the entering downward movement and inertia and
momentum will resist the exiting upward movement.
With the rod, on entering the rod is flexed upward, on leaving this flex
will increase the upward movement of the aileron trailing edge. Doesn't
take too much imagination to suspect things could get very bad, very
fast. This ignores the mechanical complexity of some sort of flexible
mounting to accommodate the different effective length of the rod as the
aileron moves.
We have almost 100 years of experience with mass balancing of control
surfaces to eliminate flutter. Believe it is best in this case to stick
with what is known to work.
Tom Kuffel, CFI etc.
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Subject: | Re: Anti Flutter idea.... |
Use the tried and true counterweight method. Your proposal is (quite frankly) a
good way to disassemble your Kolb in a remarkably instantaneous fashion..
--------
Richard Pike
Kolb MKIII N420P (420ldPoops)
Kingsport, TN 3TN0
My soul shall be joyful in the LORD; It shall rejoice in His salvation. Psalm 35:9
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