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Flutter of flaperons

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Jim Shumaker

Joined: 09 Jan 2006
Posts: 106

Posted: Fri Jun 20, 2008 7:47 pm Post subject: Flutter of flaperons

Chris

  

 If the Ribs move when you wiggle them they are probably broken.  55 is slow for flutter to show up.  If you have the counter weights this is the first we have heard of flutter with proper counterweights.  How fast was the flutter?

  

 Jim Shumaker

  

 



 

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Jim Shumaker

wingsdown(at)verizon.net
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Posted: Sat Jun 21, 2008 3:50 pm Post subject: Flutter of flaperons

What  ever you do fix what you think may be causing the flutter before you fly again.  You may already know, but flutter is such weak word  something that can be  fatal. What starts out as , well something you can hardly feel can develop in  seconds to a major structural failure. I would say if I were to go up after  having experienced flutter and did not know for sure I had isolated and fixed  the cause I would wear a parachute. I am serious. 

  

 Rick  

 [quote]   

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chris(at)southernskies.ne
Guest

Posted: Sun Jun 22, 2008 7:56 am Post subject: Flutter of flaperons

Rick- yes I am aware of this and have grounded the plane for now. I did look the plane over again with another A&P and am waiting for a very experienced Kitfox/Avid owner to come and take a look.



We did find the nylon plates that provide a bearing surface going through the turtledeck busted and I made up some better, wider Delrin bushings that have a nice fit.



I also found some areas on the flaperons where the foam is not tight and will fix that.



Also, I'll replace all the hanger/flaperon spar bushings- they do have a little play-are those standard size bushings?. Could use some advice on how to get them out. Drill the rivets out and pull the tube/spar out? Will the foam cause a problem?



After removing the linkage I found that the flaperons do not balance on the hinge. They flop down one direction- is this o.k. or do I need to balance them so they stay in any position?



Thanks for all the help and advice!



Chris Bowles

KF 3 Rotax 582





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Mnflyer

Joined: 15 May 2006
Posts: 78

Posted: Sun Jun 22, 2008 8:29 am Post subject: Re: Flutter of flaperons

Hi Chris check the entire aileron linkage system any looseness or sloppiness, will need to be removed, its most likely to be in the control linkage some where.

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GB
MNFlyer
Flying a HKS Kitfox III

wingsdown(at)verizon.net
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Posted: Sun Jun 22, 2008 8:38 am Post subject: Flutter of flaperons

It is my understanding that the flaperons should be neutral balance. If

you don't already have balancers on the flap might consider the. Once on

you can add and remove lead to get a neutral balance. I would check with

the Beans for sure. 



Rick



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Lynn Matteson

Joined: 10 Jan 2006
Posts: 2778
Location: Grass Lake, Michigan

Posted: Sun Jun 22, 2008 9:50 am Post subject: Flutter of flaperons

I don't think you answered someone's question about balance  

weights....do you even HAVE balance weights on the flaperons?



Lynn Matteson

Kitfox IV Speedster

Jabiru 2200

Status: flying w/530 hrs





On Jun 22, 2008, at 11:52 AM, Southern Skies wrote:

 	  Quote: 	
		   After removing the linkage I found that the flaperons do not  

 balance on the hinge. They flop down one direction- is this o.k. or  

 do I need to balance them so they stay in any position?



 Thanks for all the help and advice!



 Chris Bowles

 KF 3 Rotax 582

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Lynn
Kitfox IV-Jabiru 2200
N369LM

chris(at)southernskies.ne
Guest

Posted: Mon Jun 23, 2008 3:39 am Post subject: Flutter of flaperons

Yes I had provided that info earlier- the counterbalance weights are installed and they are tight.



To make the flaperons balance on the hinge I would have to add weight to the trailing edge.

They fall towards the leading edge when linkage is removed.



Perhpas the foam has deteriorated?



Chris Bowles

KF3 Rotax 582



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