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Old 01-10-2008 | 02:02 PM
  #17  
Crash90
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From: Cressona, PA
Default RE: hybrid wing problem

Thanks for your input. Here is what I am considering doing.. I believe that the most important thing I can do is use my center lines and make sure that all of my ribs are parallel to the building board. Then I will glue a 1/8" balsa cap all along R2 from the spar all the way back to the Ail TE. Then usinng my 36" sanding bar, sand R2 to match the contour of the wing.

I wish I had saved the balsa sheets that I pulled the ribs out of so I could compare them to the ribs on the other wing to see exactly what the problem is. Oh well. It isn't the end of the world.

On the other running Hybrid thread I mentioned that this is my third Hybrid kit. I was asked what happened to the first two. The answer is that on both occasions, after finishing the first wing and having a chance to really eye things up, both instances the wing was messed up. To the point that I didn't feel it was worth trying to fix. I initially thought that my building skills were the problem, however I now realize that the problem seems to be somewhere in the rib structure. The only difference is that on the first 2 attempts, I didn't take the time to check rib alignment the way I did on this one. I set up R1 and R10 properly and just ASSUMED that the rest of the ribs would fall into place.

In my first wing, initially I had the problem with R2 seemingly sitting to low, however, with a little bit of re-positioning I was able to get ti right. On this wing, however, even with R2 up and flush on the bottom of the wing, it is way out of wack on the top. I don't know. This has me stumped.
What bothers me is that SR1 aileron root rib is the same size as R2 which indicates that R2 is the correct size and maybe the rest of the ribs are off.
Lets see what Mike thinks after reading these posts. Maybe he can offer a suggestion. Certainly he can give us certain points of reference on R2 and R3 that we can measure and compare to his CAD design.