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Old 12-16-2008, 08:38 AM
  #6  
100LL
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Joined APC: Jan 2007
Posts: 216
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Originally Posted by Cubdriver View Post
There is, these W & B formulas found in aviation textbooks. They can also be derived easily using basic calculus, which is a good way to prove to yourself they work. (Note: to get these to line up correctly I had to insert periods as spacers.)

a)

weight to be added or removed = ...... change in CG
old total weight .................... distance from weight to new CG

b)

weight to be shifted =...... change in CG
old total weight ............. distance weight is shifted

Ex. CG needs to move 1 inch aft to be within limit. Say it's 45 inches from the baggage compartment to the new/desired CG location, and say the airplane weighs 5,000 lbs. Using formula (a)

x ... = ... 1
5000 ... 45

Solve for x: 111 lbs. needs to be added to the baggage compartment.

Use formula (b) when you would rather shift some weight than add or remove it.

Hope this helps.
Yes it does help, thanks, exactly what I was looking for.
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