Enstrom 280C/Weight and Balance

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SECTION 5. WEIGHT AND BALANCE

1 WEIGHT AND CG LIMITS

The weight and CG limits for this aircraft are:

Max Gross Weight: 2600 lb
Max Forward CG: 103 inches
Max Aft CG: 116 inches

2 EMPTY WEIGHT AND CG

The empty weight and CG of this aircraft are:

Empty Weight: 1570 lbs
Empty Aircraft CG: 111.6 in
Empty Moment: 175212 lb-in

3 CG ARM DATA

The following arm data can be used to calculate moment at each of these stations.

Pilot 79.6 in (2.04m)
Fuel 124.4 in (3.19m)
Baggage 163.8 in (4.2m)

4 WEIGHT AND CG CALCULATION

Total weight is calculated by adding total weight of empty aircraft, fuel, passengers and baggage. Fuel weight can be calculated assuming 6 pounds per gallon of fuel. The CG is obtained by dividing total moment by total weight. Moment at each station is obtained by multiplying the arm of that station by the weight at that station. Total moment is obtained by adding moment for each station and the moment for the empty aircraft.

As an example, consider a 180 lb pilot, a 160 lb passenger and 25 gallons of fuel. Weight of the fuel will be 25*6=150 lb.


Item Weight Arm Moment
Aircraft 1824 111.6 203,558.4
Pilot 180 79.6 14,328
Co-Pilot 160 79.6 12,736
Fuel 150 124.4 18,660
Total 2170 x 249,282

The final CG is calculated by dividing the total moment 249,282 by the total weight 2170 yielding 114.8 inches. Cross checking the total weight and CG with the weight/CG limits indicates the aircraft is within limits. The "CG" is also calculated and displayed on the main menu for convenience.