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Old Feb 24, 2013, 03:13 PM
pmisuinas is offline
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Springfield, VA
Joined Feb 2000
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Look up the definition of center of gravity--it most definitely does move with the addition of weight. By definition the balance point is in the same plane as the CG. The trick is to get the balance point where you want the CG to be. So what is needed is a reference point (like XX mm back from leading edge) so you can get the balance point and CG there. Saying 4oz gets the correct CG works only if your model is exactly the same as the test model and you put the 4 oz in exactly the same place and the same way. Looking at how Michael did it, seems it may be possible to put weight in the cowl. Since it would be farther forward, you would not need 4 oz to get the same balance point/CG--it would be less.

But saying the CG doesn't move is just wrong. Where you want it may not move, but the actual CG is going to change every time the amount of weight in the nose or tail changes...Pete M
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