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Center of Gravity Calculation (C.G.)

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hgmckay

Joined: 23 May 2006
Posts: 397

Posted: Thu Dec 07, 2006 5:28 pm Post subject: Center of Gravity Calculation (C.G.)

Gentlemen:  

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Have any of you actually calculated the c.g. of your airplane using the formulas given in the Fantasy Air Flight and Operating Manual (pages 15 and 16)?  The terms La, Lt, XSAT, bSAT, bMAC are totally foreign to me. I believe the term SAT is for Mean Aerodynamic Chord (MAC), but I’m not sure. I do see the term MAC, but is is expressed as bMAC, and I don’t know what this is. Page 16 and the various formulas and the table with * is completely confusing to me. Has anyone actually used these formulas?  

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I know how to locate the weight and balance and C.G. of an airplane using the FAA Weight and Balance Handbook, but page 16 of the Fantasy Air Allegro 2000 F&O Manual is a mystery to me! Can anyone shed any light on page 16?  

<![if !supportEmptyParas]> <![endif]>  

Hugh McKay  

Allegro2000  

912UL  

N661WW  

        [quote][b]

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Aero Siam

Joined: 30 Jan 2006
Posts: 16
Location: Thailand

Posted: Wed Sep 05, 2007 7:10 pm Post subject: Re: Center of Gravity Calculation (C.G.)

Hugh



Thom Riddle has an Excel sheet for calculating the CG on the Allegro. You can download it from my site. This only applies to his aircraft but gives a good approximation for any Allegro UL. 

http://www.aero-siam.com/page12.html

Thom is very helpful as you can see from his frequent posts and I am sure he can answer questions you have.

On my Allegro 912S, the CG is near the forward limit. This increases the stall speed slightly but makes the plane's handling safer than a rear CG.

Regards



Paul

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