From this graph, Fujita then released the following descriptions for the F-Scale http://www.spc.noaa.gov/faq/tornado/f-scale.html. Over the years, the F-Scale has revealed the following weaknesses: 1  It is subjective based solely on the. 2  caused by a tornado.
9 Answers. The empty weight is the weight of the airplane including anything that is permanently attached to it and includes any un-drainable fluids. There is a maximum gross weight for takeoff and on larger aircraft there may be a maximum landing weight. The useful load is the difference between the maximum gross weight and the empty weight. To the empty weight, you have to add the fuel, oil, any other fluids, pilot and passengers, and baggage.
Report Abuse. It depends on the temperature of the fuel. The airline industry uses a temp of 15 C which is almost 60 degrees F, for the weight of fuel, which is loaded onto planes based only on weight, not gallons. Obviously, when fuel is colder than that, it is more dense, meaning more weight for the volume of fuel.