A lot of discussion is going on here...

In reading Seligs book on basic airfoil design, I got the impression that the 8xxx series was designed specifically for powered planes (which has that big fan in the front) while the 7xxx series was designed for silent flight.

If I recall correctly, the 8036/8037 combination is used in at least two (and probably more) of the Top Flite Gold Edition kits. The 8036 transitions to an 8036 at the tips to ease up on tip stall, if I remember correctly.

I want to kitbash the 4*40 as an experiment (it seems like all my planes are experiments in one way or another - whether I want them to be or not). If the wing works as well as I hope that it does, then I want to use that 8036 airfoil in a stand-off scale plane that I want to build.

For the record, I will be sheeting the LE right up to the high (and low) points on the foil, then go with capstrips for the rest of the way.

Dickeybird, I never thought of using D-Tube. Thanks for bringing that to my attention. I "used" to know what D-tube construction was when I followed R/C several years ago but haven't seen a recent example of it. I'm wondering what kinds of improvements have been made since then.

Can you suggest a web site that might show me some recent D-tube designs? I might like to try them out... The D-Tube stuff that I used to see was for CL, and that was only a vague memory.

I was concerned that C-tube of construction might be a little flimsy for R/C, but you say that you're using it with good results. Could you point me to an example of it? I'd appreciate it.

Does anyone else have any points for discussion about the 8036/8037?