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Gross weight calculation
From statical data, the ratio of useful load to gross weight is 0,4 for just about all aircraft. Some ultralight aircraft has ratio of 0,5, are an exception to this rule. Useful load is summary the people weight and fuel weight.
For example, if weight of four people is 4 x 170 lbs = 680 lbs, fuel weight 50 gal x 6 lbs/gal = 300 lbs, summary is 980 lbs, gross weight 980/0,4 = 2450 lbs.
The empty weight is simply the gross weight less the useful load.

