Thanks, MinnFlyer for your repliy, very helpful
I have another question.
Concerning Hinging. Visiting a group of silentflyers, (a sailplane club), I discovered a new way of hinging control surfaces. In power plane construction the leading edge of a control surface is rounded, then attached to the center of the wing using nylon, or CA hinges. Control surfaces on sailplanes are beveled 30 to 45 degrees and attached to the top of the wing using hinge tape (Packing Tape). It looks very clean and seals the gap between the control service and the wing. Greatly reducing control service flutter at high speeds. I'd like to use the same technology on my Cobra. But I'm concerned about fuel residue lifting the hinge tape. Any suggestions?

I make my own hinges out of worltech fabric covering. The basic idea is to take to strips about an inch to inch and a half wide and then with the glued sides out, sew them together down the middle with a small stitch setting on a sewing machine. Now you just iron on your hinge and then cover as normal. This technique will produce a strong, gapless hinge.

This is the only type of hinge I an currently using. I have never used CA hinges, and don't plan to start.

I would stick (no pun intended) to CA hinges (See link

http://www.rcuniverse.com/reviews.ph...ew&reviewid=55

And then seal the gap with a strip of covering or packing tape.