[NSRCA-discussion] Odyssey CG

[Tom Simes]

On Tue, 1 May 2007 14:13:54 -0400
"Ken Velez" <kvelez at comcast.net> wrote:

> Anthony I think the 3 inches will not work for you that is not 30%.
> That holds true if it was a straight wing like in a trainer. In a
> taper wing you have to figure out the center of the wing compensated
> for the taper and them measure and figure out your 30%. There is a few
> different ways to do this but I think the easiest is to add the root
> length to the tip and the tip length to the root. Any way I attached
> the figure so you can see it, If you have any questions just ask. Hope
> it helps.\\

I agree with Ken, I believe the good Dr. is referring to 30% aft of the
leading edge on the Mean Aerodynamic Chord (or MAC) as opposed to 30%
aft of the LE on the root chord. Here is a good explanation of the the
method Ken was referring to:

http://www.lferc.com/Tips/mean_aerodynamic_chord.php

On a rectangular wing, the MAC and root chord are the same - which is
one reason people get complacent about just going 30% back from the LE
of the root chord.  But a tapered wing is a different animal.

Tom
 
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Tom Simes                                       simestd at netexpress.com 
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