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Old Nov 21, 2012, 04:21 PM
richie967 is offline
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Cardiff, UK
Joined Aug 2008
357 Posts
O dear!

Quote:
Originally Posted by small_rcer View Post
When a Clark-Y airfoil has the base or bottom horizontal, it has a positive angle of attack.

The reason I say this, is because the angle of attack is "usually" measured from the centre of the radius of the leading edge to the center of the trailing edge.

With a Clark-Y having the bottom as a datum, you could have several degrees of angle of attack.

A simple rule is 1/16th of an inch at 4 inches is 1 degree. So if the chord is 12 inches, 3/16ths of an inch is one degree.

What is the height of the centre of the radius of the leading edge, above a straight edge held along the underside of the wing?

See this link for a sample

http://airfoiltools.com/airfoil/deta...foil=clarky-il

Jim H
O no!

In that case I guess the wing position needs to change. Unsure as to the radius of the centre of the leading edge robably around 5mm Ish.

So does this mean I need to give the elev some down trim to compensate? Or would it be best to give ailerons some trim instead?

Cheers for the link, it helps a lot.. Even though it's not what I wanted to see!
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