Parasitic Drag

[sligo565]

Hi Guys,

Could anyone tell me how to calculate the Drag Polar?

Is it:

1/(pi x A x e)

Where A = Aspect Ratio
e = Oswald Efficiency Factor

I have graphs of CL vs CD and i was just wondering do i use this or do i use the CDmin as an estimation?

[eflightray]

Sorry I haven't a clue, I never fly where there are parasites or polar bears :D

But I did find this with a quick search, no idea if it's what you want but it looks and uses those sort of words. ;) Me? I just chuck them in the air and hope. :D

The Dreese Airfoil Primer (http://www.dreesecode.com/primer/airfoil3.html)

Hope it's of some use.

[vintage1]

Drag Polar?

That's "Eskimo Nell" isn't it?

;)