Another method for determining the loaded weight and CG is the use of graphs provided by the manufacturers.
To simplify calculations, 100, 1,000, or 10,000 may sometimes divide the moment. The following is an example of the graph method.
Given:
Front Seat Occupants . . . . . . . . . . . . . . . . . . 340 lb
Rear Seat Occupants . . . . . . . . . . . . . . . . . . 300 lb
Fuel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40 gal
Baggage Area 1 . . . . . . . . . . . . . . . . . . . . . . . 20 lb
The same steps should be followed as in the computational method except the graphs provided will calculate the moments and allow the pilot to determine if the airplane is loaded within limits. To determine the moment using the loading graph, find the weight and draw a line straight across until it intercepts the item for which the moment is to be calculated. Then draws a line straight down to determine the moment. (The red line on the loading graph represents the moment for the pilot and front passenger. All other moments were determined in the same way.) Once this has been done for each item, total the weight and moments and draw a line for both weight and moment on the center-of-gravity envelope graph. If the lines intersect within the envelope, the airplane is loaded within limits. In this sample-loading problem, the airplane is loaded within limits.
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