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1. 08:09 AM - Re: Re: Lightning Elevator flutter (N1BZRich@aol.com)
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Subject: | Re: Lightning Elevator flutter |
Selwyn
Good luck on that upcoming first flight. Hopefully you will send us
all an announcement and some photos for the newsletter.
As to your question about rod end free play, I am not aware of the
allowable free play limit for any "go" or "no go" decision on using them out
of the box. I suspect that the problem was just a batch that all had the
upped limit, what ever that is. The aileron control design has three rod
ends in close proximity at the aileron bell crank and aileron control horn.
In the case that I was talking about, with three that close together, it
allowed the trailing edge of the aileron to be moved almost a half inch up and
down when the stick was held in the center position. This movement was
more than I had seen on other Lightnings or Esqual. Being this loose
allowed the ailerons to "buzz" up and down in some flight situations. Initially
we solved the "buzzing" by reflexing each aileron up slightly which put an
air load on them and prevented the "buzz", but the real fix was replacing
the rod ends with new ones. I suspect that the aileron "buzzing" in flight
caused the rod ends to loosen up even more than they initially had been.
Hope this helps.
Blue Skies,
Buz
In a message dated 8/13/2010 7:47:35 A.M. Eastern Daylight Time,
selwyn@ellisworks.com.au writes:
--> Lightning-List message posted by: "selwyn" <selwyn@ellisworks.com.au>
Hi Smokey,
Interested to hear your experiences, I hope to be flying in about a week
so I have all this to look forward to.
What type of gap elevator gap seal did you have on, just tape along the
hinge line? And, does anyone care to speculate on why gap seals would
promote flutter (or whatever it was that was going on)?
Buzz, in relation to your comment about some rod end fittings developing
free play, as I'm sure others have noticed, some of them come out of the
packet with free play built in. Is there any good data on the allowable free
play in the control circuits, especially the ailerons?
smokeysmail(at)bigpond.co wrote:
> All is in good condition and I think it is the gap seal on the elevator,
will know soon. When I experienced the flutter like symptoms it was not
possible to hold the elevator from moving up and down, it ceased as soon as I
slowed a few knots and It only lasted a couple of seconds as I was
increasing speed slowly at the time.
> Cheers Smokey
>
--------
Cheers, Selwyn
Kit 66
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_http://forums.matronics.com/viewtopic.php?p=308634#308634_
(http://forums.matronics.com/viewtopic.php?p=308634#308634)
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