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Making an Eppler 423 airfoil out of fanfold

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Making an Eppler 423 airfoil out of fanfold

Old 09-29-2007, 07:44 PM
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xray328
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Default Making an Eppler 423 airfoil out of fanfold

Hey guys. I'm using the foamfly.com wing jig, but I want to use my own airfoil, an Eppler 423. Heres the picture...

http://www.ae.uiuc.edu/m-selig/ads/afplots/e423.gif

Do I just cut the airfoil flat at the "0" line, or connect the leading to the trailing edge and use that as the flat bottom of the template? This is a little different since this is a fanfold wing instead of a foam core.

The bottom of the template has to be flat to use the jig. So I can only use the top of the airfoil, and not the bottom. How can I make this work?

For those not familiar, the thin piece of 1/4" foam has to be formed over the template, and then the whole assembly baked in the oven to harden the foam.

Thanks!
Old 09-29-2007, 08:52 PM
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Tall Paul
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Default RE: Making an Eppler 423 airfoil out of fanfold

Looking at the jig on their site, I'd say make up a lower fixture that has the lower airfoil surface as the top.
The lower surface of the fanfold material rests on this.
And due to the shape of the 423, you'll probably need some ribs to have the upper fanfold material maintain the upper surface shape.

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