[NSRCA-discussion] CG

[Rcmaster199 at aol.com]

Ron, I would like to see your rendition, if you can share it, or tell me 
where I can find it, if in the public domain. It will be interesting to compare. 

Thanks
Matt



In a message dated 5/29/2006 8:03:41 PM Eastern Standard Time, 
vanputte at cox.net writes:
In my calculations I do include the area occupied by the fuselage.  I assume 
the calculation by Nat does as well, but I don't speak for him.


Ron Van Putte

-----Original Message-----
From: nsrca-discussion-bounces at lists.nsrca.org 
[mailto:nsrca-discussion-bounces at lists.nsrca.org]On Behalf Of Ron Van Putte
Sent: Monday, May 29, 2006 6:07 PM
To: NSRCA Mailing List
Subject: Re: [NSRCA-discussion] CG




On May 29, 2006, at 4:40 PM, Nat Penton wrote:


The following formula was presented by noted British modeller Gordon 
Whitehead in How To Make Scale Models Fly ( 1980 ??). I have been using it over 20 
years and find it dead on for pattern:
CG (from LE MAC) = MAC/6 + 0.25x As/Aw M
As - area stab Aw - area wing
M - moment arm, ac to ac
It is easy to use the graphic method to find the wing MAC. You can guess at 
the stab MAC and be close enough.
The formula works on anything from a tailess to a Quickie.


Nat - I haven't compared the formula with the one I developed more than 40 
years ago, but I think yours would be better understood if you use some 
parentheses:


CG (from LE MAC) = MAC/6 + 0.25x (As/Aw) M


Also, the wing and stab area should include the ailerons and elevators, 
respectively.




Ron Van Putte
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