## Calculate inner surface Naca airfoil

## Calculate inner surface Naca airfoil

(OP)

Hello everyone, I know the equations from which I can calculate a Naca airfoil, if I have a thick, How is the inner surface?

I´m sorry for my english level.

I´m sorry for my english level.

## RE: Calculate inner surface Naca airfoil

## RE: Calculate inner surface Naca airfoil

Sorry for my English.

## RE: Calculate inner surface Naca airfoil

## RE: Calculate inner surface Naca airfoil

## RE: Calculate inner surface Naca airfoil

## RE: Calculate inner surface Naca airfoil

## RE: Calculate inner surface Naca airfoil

i would have all the lower surface points and copy them some +ve amount, and then all the upper surface points and copy them the same -ve amount, and then "fuss" the nose area; the inner point at the nose is the offset distance aft of the outer profile.

## RE: Calculate inner surface Naca airfoil

One method that will give you a close approximation is to take your data points for the air foil curve, then insert a circle at each point, the radius of which is your desired offset.

Then draw a spline curve tangent to each circle.

You may have to do some adjusting at the trailing edge and leading edge especially if the leading edge is defined by a radius. If that is the case draw a smaller one off set by your thickness.

B.E.

The good engineer does not need to memorize every formula; he just needs to know where he can find them when he needs them. Old professor

## RE: Calculate inner surface Naca airfoil

-Kirby

Kirby Wilkerson

Remember, first define the problem, then solve it.