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Old May 20, 2001, 02:39 PM
small electrics r BIG FUN
Iowa
Joined Aug 2000
4,299 Posts
Does the specified C G change with heavier motor/batteries ?

Let's say a plane comes with the C G specified for a certain location, say, 2 inches from leading edge of the wing.

If I install a heavier motor and esc, I don't balance in a different spot, do I ? Don't we move the flight pack or something else to maintain balance in the factory location ?

Thanks

Al
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Old May 20, 2001, 03:59 PM
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Doc Watson's Avatar
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Joined Mar 2000
1,197 Posts
Al P,

Balance the plane in the same place. A heavier model will just have a faster minimum speed (and higher structural stresses).

Doc
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Old May 22, 2001, 10:06 AM
Balsa Flies Better!
Stamford, CT
Joined Oct 2000
6,704 Posts
Depends on the design and the amount of extra weight. For a standard clark y type airfoil and a flat plate stab + 20 % in weight or so, you're probably OK. For an undercambered wing with a lifting stab- move the c.g. forward as weight increases. It's often not a bad idea to sneak the c.g. forward a bit for first flights-and set a little extra up in the trims. Nose heavy airplanes get retrimmed, tail heavy airplanes get rekitted.

Sam Brauer
Norwalk, CT
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Old May 22, 2001, 03:26 PM
small electrics r BIG FUN
Iowa
Joined Aug 2000
4,299 Posts
Thanks for the replies.. I moved my flight pack forward 1/4 inch and it flies great now.

Thanks

Al
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Old May 22, 2001, 04:25 PM
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United States, CA, Bear Valley Springs
Joined Feb 2000
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The CG is an inherant part of the design that does not change. The balance however will change.

mw
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