Ed, I didn't know you frequent this joint. Then again, I haven't been here long enough to know much.

I'd agree that for the 1.20 size and under, just about any wing tip design will work fine. Heck, I remember reading in an article that some guy built a fun-fly with an airfoil shaped from his wife's stiletto. So many of the smaller models are overpowered and flying on the motor more than on the wing anyway.

I'm a little rusty since my undergrad Fluid Dynamics classes 15yrs ago, but for the bigger models (1/4 scale and up), the Reynolds number do begin to approach those of full scale aircrafts. Of course I don't mean 747s, but the RVs and Cessnas aren't all that much bigger than some of these newer 1/3 and 40% ARFs.

As I have not progressed too far beyond the basic RC flying skills stage, my main interest is to improve low speed and stall characteristics. In another words, keep the plane flying good and me out of trouble. That is why Ed's article grabbed my attention. I guess I'll just have to keep the wingtips squared off and try a few simple bolt-on tip designs to see what happens. Thanks all for the comments.