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-   -   Aileron twist correctable? (https://vansairforce.net/community/showthread.php?t=123458)

rvbuilder2002 03-07-2015 02:42 PM

Quote:

Originally Posted by Tom Martin (Post 965463)
Did you mount it on the wing and check it there?

Tom,
I'm not sure i understand the reasoning for checking for twist with it on the wing?
The only reference at the inboard end is the flap which could also be slightly twisted and not be a valid reference.
You can check the alignment of the top spar flange rivets to the top skin trailing edge but I don't think that is as reliable as a known to be flat surface (I don't personally know if a granite counter top will always be guaranteed flat)

1/8" twist is not enough to have a negative influence aerodynamically (a lot of RV's are flying with worse), so at this point you will have to decide whether you are willing to accept it or not.

Tom Martin 03-07-2015 03:24 PM

By mounting the aileron and flap together on the wing it is possible to see how things line up relative to the wing. I clamp a long straight edge to both surfaces. A long sting would also work. I suppose you could have a twist one way with a flap and the other way an aileron that could cancel out. The point is that, as you say minor differences will not affect flight, but minor differences are really obvious when you mount the wing tip on and sight from the tip inward. The "eye" will see a 1/8" difference when the wing tip, aileron and flap are lined up.
A very minor error in a table top will show up on the final rigged aircraft, that is why I like to verify the surfaces on the wing, not just on a flat table.
It is interesting that I would have had the same error on the same aileron had I not checked this on my wing first.

Arablenz 03-07-2015 05:19 PM

Aileron twist correctable
 
Hi , introducing myself for the first time as a builder of a rv14 down under in New Zealand. I have watched this forum for a sometime but now that I am building, thought it appropriate I participate. Thankyou Doug for a great forum.
HeliCooper I am just working on my ailerons at the moment and noticed my right aileron ribs that attach to the counterbalance are slightly off when lined up on a flat surface but the left seems o.k. Maybe your first assessment is correct that the counterbalance attach is throwing everything out of alignment.
I am redoing my right aileron counterbalance but luckily am not as far on as you are.
I am a first time builder and so feel your pain but I am very interested in the outcome of this thread.

HeliCooper 03-07-2015 09:12 PM

I've decided to just accept the twist at this point. My reasoning being that in order to correct it (or hope to correct it) I would have to remove the 10 rivets for the second time and remove the top skin rivets. All of that removal takes time and possibly compromises the structure. If it drives me crazy down the road I will make a new aileron from scratch.

Thanks for all the help. Bummed out the bottom rivet removal didn't help solve the problem.


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