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11-08-2005 | 09:51 AM

#22

Dragondawn

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From: Hill Top, UNITED KINGDOM

RE: Need airfoil advice

Quote:

ORIGINAL: BMatthews

Close N1 but it's not thicker. Profili shows them both at 16% but the 8037 has 2.7% camber vs the 8036's 1.85%. But the effect is still what you want... a delayed stall at the tip. A form of aerodynamic washout.

Hi guys,
I too am looking for suitable airfoils for a scratch-design and I see the Selig sections mentioned often. But I have a question about the amount of washout used.... so with a root chord of 15" (& an S8036 'foil) and a 7" tip chord (& an S8037 'foil) - this seems very similar to N1EDMs

- does anyone have any idea how much washout I should add?

(Design is based on a lates '30s racer, 71" span and hopefully around 12lb, but I'm not interested in the speed, just a stable, predictable flyer).

Any help &/or advice would be much appreciated!

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