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Old 03-24-2007 | 05:14 PM
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iron eagel
 
Joined: Jul 2004
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From: Middleboro, MA
Default RE: CG check.
ORIGINAL: Lomcevak Duck

Hey guys, help me out here just a second.

I'm building a tailess plane powered by a .15 and I need your help verifying the balance point.

36" span
8" @root
5" @tip
2" sweep @tip

I'm thinking I should balance it at about 20% MAC

using http://www.palosrc.com/instructors/cg.htm
I get the result of:

MAC: 6.62" @ 8.31" from root
Balance point @root chord: 2.25"

When I plot out the CG location it doesn't look right.
I would appreciate if someone better versed in the science of aerodynamics could double check my work please.
With flying wing (tailess) designs you will find that 20% may be to far aft. One plane I built of the flying wing type actualy needed to be around 12% of mac to be able to glide without trying to pitch up when you cut power (pusher).
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