C.G.Calc. v1.1
By Gez Watts Copyright 2001

Install:

Click on the Zip file and when the ZIP window appears select Action - Select All, then click Extract. Now select the drive where you want to install the Set Up program. Make a new folder or choose an existing folder. Click Extract. Close WinZip. Go to the folder where you installed the Set Up program and click Set Up.exe. When the program is installed you can delete the folder you unzipped to, provided you don't have any other files in there!

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Usage:

This program is designed to do the math of a Centre of Gravity calculation for an aircraft. 
I've used the formula for over twenty years on many, many models and have never had a rearward C.G. on a maiden flight. The formula is well known and has been around for a long time.
The program gives a safe C.G. 
In most cases the C.G as worked out with this formula has been used for the life of the model concerned, delta's included. 
It does require an understanding of how to determine the Average Chord of a wing or wings. An educated guess is almost always good enough, however.
As a guide, if the wing is constant chord then it's just the chord, but if the wing is tapered or swept etc then: 

add a root chord at the leading edge of the tip, then a tip chord at the trailing edge of the root and join the resulting points, then draw a line down the wing from 50% root chord to 50% tip chord, where the lines intersect will be found the average chord.
For further clarification visit the online Help at http://fennis-flyers.tripod.com/id49.htm  

You will notice if you input very small values that the span and average chord set themselves to 15" and 2". This is to avoid division by zero errors and other gremlins.

You can change any value at any time and the program will recalculate the results with the new data as soon as you click Calculate.

Distribute freely provided no charge is made and this Read Me accompanies the program. If you pass on only the executable it may not work on all systems due to the lack of dependant files which accompany the full set up program. Please only pass on the full set up program.

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AGREEMENT :

I accept no responsibility for damage, loss or anything else as a result of using this program. 
Distribute freely provided no charge is made and this Read Me accompanies the program.
You must not alter the program or program code in any way. 
You automatically accept this agreement if you use this program. GW 2001.

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I hope you find it useful.