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-   -   Wing panels with difference deg. of incidence (https://www.rcuniverse.com/forum/scratch-building-aircraft-design-3d-cad-174/11621606-wing-panels-difference-deg-incidence.html)

karolh 09-10-2015 08:46 PM

Wing panels with difference deg. of incidence
 
Just received a second hand 65" sport model that requires some repairs, and on checking it out I found that one wing panel is at 0.0 deg. while the other one is at +1.0 deg. If I chose to leave it as is how bad an influence will this have on it flight performance.

Rodney 09-11-2015 06:45 AM

Very bad characteristics. It will want to roll and any change in airspeed will require a new trim to fly level. I'd find a way to correct it before trying to fly it.

karolh 09-11-2015 04:20 PM

Thanks Rodney.

fredsedno 09-12-2015 12:39 PM

No problem mon,

Seriously,remove the dihedral brace [if possible] and construct a new brace.
Trying to reproduce the original may not be necessary. fredsedno

Rodney 09-13-2015 06:53 AM


Originally Posted by fredsedno (Post 12098359)
No problem mon,

Seriously,remove the dihedral brace [if possible] and construct a new brace.
Trying to reproduce the original may not be necessary. fredsedno

That changes the dihedral, not the incidence. You will need to do more than change the brace.

fritzke 09-17-2015 07:36 PM

If it's a sheeted wing, cut it in half and put it back together with epoxy and glass cloth.
I did this once on an Adrian Page Gee Bee (glued the wings together at different AOA that is) and it was unflyable except by the clubs hotshot pilot. And he only flew it one and said he would not fly it a second time! Yes, with every speed change and the roll trim changes. Not good.

BMatthews 09-22-2015 07:19 AM

I'd suggest the cut as well. But with a variation. One degree isn't much of a twist. So if you cut in from the leading and trailing edges but stop at the spar. Then you can block the wing panels to achieve side to side equal angles. To join things back together use a filler "rib" of balsa or plywood which matches the kerf of the saw blade. Then cap the joint with a strip of light 1 inch wide fiberglass tape with epoxy to finish the job. That way the spar joiner holds in the dihedral but you free up the wing enough to twist the panels back into alignment.

And yes, it's worth doing. It'll alter the amount of trim needed for each airspeed as Rodney says. Been there and hated it.


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