will this airfoil work?

[Teufel Hunden]

Is there any reason why this airfoilf would not work?

It is made of 2mm coroplast and the flutes are running with
the wingspan. The design was for the flutes running with
the wing chord, which makes for a nice rounded airfoil but,
the amount of coroplast I had dictated I had to do it with the
flutes running the wingspan length.

[Ollie]

The airfoil you show will fly. The sharp leading edge and abrupt angle at the top of the ailfoil will cause early flow seperation, limit maximum lift and angle of attack resulting in premature stall compared to a smoothly rounded leading edge with a smooth contour behind it.

[emoone]

Here's what the SPAD guys came up with. If you have to build a sharply angled airfoil you are better off having 2 spars. They say this improves the airflow seperation at the top of the wings.

Here's a pic!

Eddie

[Teufel Hunden]

Eddie, thanks for the info.
I'll have to try that next time, but for now the single spar will
have to work.

[competitior]

Teufel;
Remember, about 80% of the lift is produced on the bottom of the wing. Leading edge shape matters a lot and round is usually better that sharp. In some extream cases with a very stable flying conditions, a sharp leading edge is used to induce turbulent airflow and delay final stall. Such wings can operate at angles of attack in the range of 16-18 degrees. When they do stall they just fall out of the air. You might want to go to the web site at

modelresearchlabs.com

and check out the H.L. Glider airfoils
Competitior