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Author Topic: air foil 4% en 2,5%  (Read 308 times)
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Topic starter

« on: June 19, 2019, 06:36:59 AM »

Hello i'm new in F1D world
im want to build the salt..   from THE F1D BLOG
but there is no air foil on the drawing only a number .
can please someone give me the drawing ore the way to draw this?
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« Reply #1 on: June 19, 2019, 07:34:23 AM »

I do not do F1D, but will guess that the wing airfoil is a circular arc of 4% thickness and the stab airfoil is a circular arc of 2,5% thickness.

Now maybe someone who actually knows the answer will respond.

Fred Rash
Tapio Linkosalo
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« Reply #2 on: June 19, 2019, 08:00:14 AM »

Absolutely correct. 4% airfoil is a part of circle, that for 200mm wide wing is 4% or 8mm "tall" in the center. In other words an arc that fits in a 200mm*8mm box.

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« Reply #3 on: June 19, 2019, 09:55:05 AM »

The radius of the circle is easy to calculate, given the dimensions of the "box" that Tapio describes in the post above.  If the width of the box is "c"   (chord) and the thickness is "h"       (example if c=200, then h =8 for a 4% thickness)

This little diagram shows the layout if you were to draw it out on the plan:  "R" is the radius needed to fit the parameters. 
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Re: air foil 4% en 2,5%

Make the same mistake on both sides; nobody will notice...
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