Re: indoor airfoils

From: Erik Bock <joorgawt_at_yahoo.com>
Date: Sat, 12 Apr 2014 13:54:37 -0600

Chord percentage to arc

Height= (Camber/100) * chord
Radius = 0.5 * ((chord^2)/(4*height) + height)

---
On Apr 12, 2014, at 7:48 AM, <slowfly100_at_yahoo.com.au> wrote:
> Hi all,
> 
> I am trying to understand what is meant by 4% arc as related to plans for wings?
> 
> Are the typical airfoils just a segment of a circular arc? If that is the case, how do you determine
> 
> the diameter of the circle, if the spec is 3% 4% or 5% for example? 
> 
> Also is it normal for the ribs to be constant depth along their length? Or does the circular arc just refer to an
> 
> imaginary camber line, and the thickness of the rib varies at different stations?
> 
> 
> 
> thank you for any assistance.
> 
> regards
> 
> Tim
> 
> ps I did read the file on indoor airfoils in the files section, but couldn't really understand it.
> 
> 
> 
> 
> 
> 

Received on Sat Apr 12 2014 - 12:54:44 CEST