Chapter 10
Use of Computer for Weight and Balance Computations
The CG is shifted forward 1.36 inches.
Determining Weight Shifted to Cause Specified ΔCG
How much weight must be shifted from the aft baggage compartment at station 246 to the forward compartment at station 118 to move the CG forward 2 inches? The total weight of the airplane is 4,709 pounds.
- Determine the number of inches the baggage is shifted: (246)(–)(118)(=) 128
- Use this formula:
Weight shifted = (Total weight × ΔCG) / Distance weight is shifted
(2)(×)(4709)(÷)(128)(=) 73.6
Moving 73.6 pounds of baggage from the aft compartment to forward compartment shifts the CG forward 2 inches.
Determining Distance Weight Is Shifted to Move CG a Specific Distance
How many inches aft does a 56 pound battery need to be moved to shift the CG aft by 1.5 inches? The total weight of the airplane is 4,026 pounds.
Use this formula:
Distance weight is shifted = (Total weight × ΔCG) / Weight shifted
(1.5)(×)(4026)(÷)(56)(=) 107.8
Moving the battery aft by 107.8 inches shifts the CG aft 1.5 inches.
Determining Total Weight of an Aircraft With a Specified ΔCG When Cargo Is Moved
What is the total weight of an airplane if moving 500 pounds of cargo 96 inches forward shifts the CG 2.0 inches?
Use this formula:
Total weight = (Weight shifted × Distance weight is shifted) / ΔCG
(500)(×)(96)(÷)(2)(=) 24,000
Moving 500 pounds of cargo 96 inches forward causes a 2.0-inch shift in CG of a 24,000-pound airplane.