Re: [PSUBS-MAILIST] NACA 65-020 High Aspect Ratio Fin Development

[Jon Wallace <jonw@psubs.org>]

Got it.  Thanks for that.  I wasn't considering angle of attack, which 
with a flat surface could certainly bump up the drag.


Sean T. Stevenson wrote:
> At any angle of attack other than zero, a flat surface may have flow 
> separation on the low pressure side, shedding vortices and inducing 
> drag.  This is what is known as "stall angle".  The foil shape 
> maintains laminar flow over the foil at the greatest possible range of 
> angles of attack, preventing flow separation until the angle of attack 
> is much greater than could be accomplished with a flat control 
> surface, and also minimizing drag in the process.




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