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  #1  
Old 12-21-2021, 03:07 AM
Scotty G's Avatar
Scotty G Scotty G is offline
 
Join Date: Aug 2020
Location: PHX
Posts: 155
Default How to Balance Ailerons

Hi gang,

My ailerons have a significant amount of paint on them after a recent paint job. I’ve looked in the drawings and build instructions I have (pilot, not the/a builder) and can’t find a procedure for balancing the ailerons. Can anyone point me in the right direction?

Thanks in advance.
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  #2  
Old 12-21-2021, 07:42 AM
FinnFlyer FinnFlyer is offline
 
Join Date: Aug 2018
Location: Bell, FL
Posts: 647
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Quote:
Originally Posted by Scotty G View Post
Hi gang,

My ailerons have a significant amount of paint on them after a recent paint job. I’ve looked in the drawings and build instructions I have (pilot, not the/a builder) and can’t find a procedure for balancing the ailerons. Can anyone point me in the right direction?

Thanks in advance.
Never heard of balancing ailerons.
One possibility is to place weights positioned on top of the 3/4" steel pipe until your find out how much is needed. Then measure out that weight in small lead pellets and epoxy resin, mix and pour into the steel pipe (aileron removed and standing on edge with the other end of the pipe plugged).
Or melt the lead in a can with propane torch and pour.

Finn
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  #3  
Old 12-21-2021, 07:47 AM
BH1166 BH1166 is offline
 
Join Date: Nov 2017
Location: Eatonton Georgia
Posts: 694
Default Manual trim kit

You dont say which rv model you have. This or electronic trim is the solution. Seach vans web store maual aileron trim, -vs- trying to balance.

https://store.vansaircraft.com/rv-7-...t-ail-t79.html
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  #4  
Old 12-21-2021, 08:07 AM
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Carl Froehlich Carl Froehlich is offline
 
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Location: Dogwood Airpark (VA42)
Posts: 3,597
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Recommend you do not do anything other than the per-plans counter weight pipe.

Balance is about flutter, not about static gravity balance. Adding more weight could push you the wrong direction.

Carl
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  #5  
Old 12-21-2021, 08:25 AM
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bjdecker bjdecker is offline
 
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Location: Georgetown, TX
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Quote:
Originally Posted by Scotty G View Post
Hi gang,

My ailerons have a significant amount of paint on them after a recent paint job. Iíve looked in the drawings and build instructions I have (pilot, not the/a builder) and canít find a procedure for balancing the ailerons. Can anyone point me in the right direction?

Thanks in advance.
What problem are you experiencing?
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  #6  
Old 12-21-2021, 09:01 AM
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Scotty G Scotty G is offline
 
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Quote:
Originally Posted by BH1166 View Post
You dont say which rv model you have. This or electronic trim is the solution. Seach vans web store maual aileron trim, -vs- trying to balance.

https://store.vansaircraft.com/rv-7-...t-ail-t79.html
Uh, no.

I posted in the RV-8 forum, so I have an RV-8.

The problem isnít trim; I have aileron trim and it functions fine. The change occurred when the paint job happened.

The shop put on an insane amount of material on the ailerons, and itís changed their balance. (According to forum rules, I canít name the shop publicly, but Iím happy to warn anyone away from the privately. Itís a Arizona shop, not in Eloy.)

The ailerons will Ďbounceí between left and right in light turbulence and above. I damp it out after about three oscillations - but it wasnít like that before. I have not tried it undamped by my hand.

Itís clear to me that the additional weight of the paint on the ailerons, aft of the hinge and no longer in check with the leading edge counterweight (if any), is out of whack.

So Iím looking to check what is going on and define the problem before I come up with any solutions.
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Old 12-21-2021, 09:05 AM
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bjdecker bjdecker is offline
 
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Quote:
Originally Posted by Scotty G View Post
...
So Iím looking to check what is going on and define the problem before I come up with any solutions.
Good call -- hand fly it and see what's what first. The oscillation you describe sounds more like the autopilot "hunting" (i.e. the roll gain is too high)...

B
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  #8  
Old 12-21-2021, 09:15 AM
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Scotty G Scotty G is offline
 
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Maybe I’m speaking Portuguese…

Although I do have an autopilot, I didn’t mention it yet because I don’t use it very much, and it may mask the problem.

The problem happens while hand flying in turbulence.

By saying I have not tried it “undamped by me,” I mean I have not had it occur without my hand on the stick.

I’d say there is a small range in the flush/wings level area that is a little dead zone. You get the ailerons moving in turbulence, and the ailerons break out “uncommanded” a little bit and cause a left-right-left wobble that I can damp out. But it’s like there is a force driving the ailerons out of flush, it excites a little, I damp it out, and I go on.

I have no way of measuring what the stick force is to damp and correct, but it’s super light and easy to do. Probably around a pound of force or less. Which tells me, if my ailerons are unbalanced, it’s not by much.

It’s almost like neutral static stability in the first breakout instant, then I can easily damp it. Kinda like power steering that’s way too sensitive.

It wasn’t this way before, and I believe it’s because there is more weight from paint on the ailerons aft of the hinge, and this now equals or outweighs any counterweight that may or may not be in the leading edge.

Hopefully that is more clear.
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Last edited by Scotty G : 12-21-2021 at 09:18 AM.
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  #9  
Old 12-21-2021, 09:17 AM
PilotjohnS PilotjohnS is offline
 
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Location: Southwest
Posts: 2,174
Default Just me

If it was me, i would disconnect each aileron pushrod and see if it flops trailing edge down. If so i would use a scale and push up on the aileron and see how much force it takes to push it up.
If the trailing edge flops up, i would not worry too much.
Either way i would call Vans once you know how much it is ďheavyĒ
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  #10  
Old 12-21-2021, 09:30 AM
danny danny is offline
 
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Location: puyallup, wa
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Doesn't sound like you've called Van's about this. Might be worth a try.
danny
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