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Old Dec 19, 2012, 09:21 PM
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USA, IL, Wheaton
Joined Oct 2010
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Sources for Peanut and Bostonian Airfoils

When I'm building Peanuts or Bostonians from plans by recognized designers like Walt Mooney or Don DeLoach, I don't worry about where the airfoils come from. Lately, I've been looking at the UIUC airfoil site and realizing that the prototypes, especially the Golden Age ones, used quite different airfoils. I realize that the low speeds and small chords used for rubber powered models force differences.

Are there recognized examples for best airfoils in the 2-3 inch chord regime? Do they have any counterparts in the database?

Some examples are pictured below. Walt Mooney's Peanut of the Curtiss-Wright 15C Air Sedan has a flat bottomed 11% airfoil pictured below. The prototype used a Goettingen 593 airfoil according to data on UIUC. That's somewhat thicker, has a rounder nose and a bit of undercamber about 2/3 back. The airfoil for Bostonian Celtic by DeLoach is a bit thinner and sharper nosed. I had a template for that airfoil that I used on my latest more conventional Bostonian, and I get good climb.

Two other pictures compare the Goettingen 593 with a Goettingen 385, which is a 10% flat bottomed airfoil. I don't see full sized planes using it, but it's a lot closer match to the model airfoils, IMHO.

I guess what I'm trying to get to is a set of coordinates that I can use to plot various sized model wings. I could just use photoshop or copier scaling, but knowing the numbers just feels better.

Any other candidates for the winning airfoil?
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Last edited by DuPageJoe; Dec 20, 2012 at 05:39 PM.
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