[NSRCA-discussion] CG

[Ron Van Putte]

On May 29, 2006, at 8:03 PM, Rcmaster199 at aol.com wrote:

> 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.

Matt and anyone else interested - Assuming that the NSRCA List can  
handle it, attached is the spreadsheet for my CG calculation.


>
> 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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