On Flutter,
We dumb engineers really enjoy collecting testing video.
The Comanche video and others were setups to determine failure modes.
For instance, if you forget to hook up the trim tab or you have
forgotten to check that the bushes are installed in the stab or trim
rod, or the bearing in your Comanche has failed and you didn't note it
on the trim tab preflight that it had 1/4 inch of play.
We just had a twin Cessna (conventional stabilizer and elevator) here in
Plant City that has severe cracking in its trim tab due to poor
maintenance. The owner and inspector did not notice or think it a
problem that the trim tab had play in it and upon investigation, the
bearing in the trim rod had disengaged from the socket and the trim tab
moved 1/4 inch on its own...
Any control surface can flutter so it is best to note how much play is
in the bearings, hinges, quick disconnects etc. in any aircraft that
flies above 120 KIAS.
Pay particular attention to those controls which are not balanced on a
wing, or tail (Rudders are normally not balanced if near vertical in non
aerobatic aircraft.
Regards,
Bud
----- Original Message -----
From: Alan Carter<mailto:alancarteresq@onetel.net>
To: europa-list@matronics.com<mailto:europa-list@matronics.com>
Sent: Sunday, October 21, 2012 11:35 AM
Subject: Europa-List: Re: Stabalator Flutter
<alancarteresq@onetel.net<mailto:alancarteresq@onetel.net>>
Wow Bud, that,s pretty scary stuff, have a lot of hours on Twin Coms.
glad i knew nothing about flutter then, what happened to it in the
video.
Well i got the first bit right, slow down, but have not that brutal
tail-plane you mention, only have a foam one!, and yes i do have a hang
up on tail planes maybe its because i can,t see it.
There have been some excellent ideas posted on MOD 73 . how to
elimination play and wear in the Toque tube, and this question is just
an extension of that topic, so hoping for some airman-ship replies also.
Regards
Alan
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