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  #21  
Old 12-21-2020, 09:07 PM
BoydBirchler BoydBirchler is offline
 
Join Date: Jul 2020
Location: Indianapolis
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A common way to adjust a heavy wing is to lower that aileron by ovaling the aileron hinges attach holes to lower the ailerons vertical position. If that had been done and the hinge bolts loosened up, letting the aileron slide up, you would see that wing become heavy again.

Last edited by BoydBirchler : 12-21-2020 at 09:24 PM.
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  #22  
Old 12-22-2020, 04:40 AM
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plehrke plehrke is offline
 
Join Date: Sep 2006
Location: Defiance, MO
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Quote:
Originally Posted by BoydBirchler View Post
A common way to adjust a heavy wing is to lower that aileron by ovaling the aileron hinges attach holes to lower the ailerons vertical position. If that had been done and the hinge bolts loosened up, letting the aileron slide up, you would see that wing become heavy again.
Really? I do not think that would be considered an acceptable fix. Kind of scary to me.
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Last edited by plehrke : 12-22-2020 at 04:44 AM.
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  #23  
Old 12-22-2020, 08:26 AM
BruceBohannon BruceBohannon is offline
 
Join Date: Jan 2017
Location: Angleton, Texas
Posts: 1
Default Welding rod

Check (or remember) to see if there was a piece of welding rod taped to the bottom TE of the left aileron. If there was one, and itís now missing, that would cause a right roll change. If not, thatís an easy way to adjust roll trim
BB
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  #24  
Old 12-22-2020, 09:10 AM
John-G John-G is offline
 
Join Date: Jan 2012
Location: Northeast Ohio
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BamBam-

One possible area that has not been mentioned yet is the cantilevered wing skin aft of the rear spar. Use a straight edge starting at a wing rib and make sure the skin aft of each wing's rear spar is on the same plane as the wing skin forward of the rear spar ... tweak as necessary and slowly make your way across the wing. Below is a link to a photo showing the aft area a little too high on my bird ... looking closely at the photo, you can see a small gap under the straight edge.
https://3.bp.blogspot.com/-YDIzWxpT_...0/DSC02429.JPG

My bird had a slightly heavy left wing after construction was completed ... and, in my case, there were areas aft of the rear spar that were not on the same plane as the wing skin forward of the rear spar ... some places were a little high and others a little low on each wing. I used a small block of wood and tweaked every few inches to get that area as straight as possible.

That fixed the heavy wing .... until I got the bird painted. Apparently just the pressure from sanding the skin was enough to bring back the heavy wing (but not as bad) so I needed to tweak the area aft of the rear spar once again to obtain hands off level flight.

I'm guessing it is possible just a little too much pressure during washing or waxing could have moved the wing skin just enough to be noticeable. This may not be your issue ... but easy enough to verify.

Happy flying,
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Last edited by John-G : 12-22-2020 at 09:14 AM.
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  #25  
Old 12-23-2020, 04:05 AM
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Dennis_I Dennis_I is offline
 
Join Date: Dec 2005
Location: Sweden, 67" North
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Quote:
Originally Posted by BoydBirchler View Post
A common way to adjust a heavy wing is to lower that aileron by ovaling the aileron hinges attach holes to lower the ailerons vertical position. If that had been done and the hinge bolts loosened up, letting the aileron slide up, you would see that wing become heavy again.
Making oval holes on flight controlls or any other thing on an aircraft is not acceptable
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  #26  
Old 12-23-2020, 08:27 AM
lr172 lr172 is offline
 
Join Date: Oct 2013
Location: Schaumburg, IL
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Quote:
Originally Posted by Dennis_I View Post
Making oval holes on flight controlls or any other thing on an aircraft is not acceptable
And how is your alternator held in place?
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  #27  
Old 12-23-2020, 09:13 AM
Freemasm Freemasm is online now
 
Join Date: Nov 2017
Location: Orlando
Posts: 275
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The engine was certified like that and an alt bracket isnít primary structure. A lose belt and a flight surface that could move in a slot/change aero/induce flutter are very different. Iím positive you already knew that and were making a point about ďabsoluteĒ type statements.
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  #28  
Old 12-23-2020, 09:32 AM
Desert Rat Desert Rat is offline
 
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Location: 50-50 Wichita KS & Scottsdale AZ
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I've seen the slotted aileron hinge process discussed on here quite a few times as a method of correcting an aileron that's mis-located vertically.

The caveat is that it's a flight test item for a short period of time, and once you understand what the correct position should be, the follow up is to order new undrilled hinges from Vans and locate proper holes in the proper position.

100% agree that it would be a horrible practice to leave them slotted over the long haul, but you could certainly see a scenario where it might have happened, and in this case be worth investigating, especially if the OP didn't build his airplane
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  #29  
Old 12-23-2020, 11:05 AM
BamBam-4 BamBam-4 is offline
 
Join Date: Sep 2018
Location: Fl
Posts: 9
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Last night we checked the incidence of the wing at the root and out towards the tip of the wing. Right wing had 8.8 degrees at tip, 8.7 on the root. Left wing had 8.7 at the tip and 8.6 at the root. At most, .2 degree split across both wings. I flew to breakfast this morning and noticed that if I bumped my flaps down about 3/4 ď or so the air raft quickly came back straight and level with no pressure. Why would that be?

Thanks for all of your replies everyone!
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