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Equation driven curve: sketching a NACA airfoil

Question asked by J. R. on Nov 30, 2019
Latest reply on Dec 1, 2019 by Rob Edwards

I am new to equation driven curves, and I can't figure this one out. I need to sketch a NACA 0009 airfoil with 500mm (actually this number will change, and needs to be parametric) chord length. The equation for this airfoil, quoted here, is:

 

 

Since my profile is 0009, this is what I write into the Solidworks Equation Driven Curve Yx field:
5 * 0.09 * (0.2969 * x^(1/2) - 0.1260 * x - 0.3516 * x^2 + 0.2843 * x^3 - 0.1015 * x^4)

And if I set my X1 to 0 and X2 to 1, the profile is drawn correctly. However, the chord length is wrong (is 1mm, should be 500mm). If I enter 500 into the X2 field, the curve even fails to generate, because X must be between 0 and 1 for this equation.

My question is, how do I scale this profile so I can have the 500mm chord length? How do I modify the formula so it's drawn correctly in Solidworks?

 

EDIT: I'm attaching the file with the sketch... It is tiny, you gotta zoom in at the origin.

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