Composition of atmosphere
78 percent nitrogen, 21 percent oxygen, 1 percent other gases
Arm
Horizontal distance in inches from the reference datum to the CG of an item
Basic empty weight
The standard empty weight plus the weight of optional and special equipment that has been installed - includes full engine oil and hydraulic levels and unusable fuel
Center of gravity
The point at which an aircraft would balance if it were possible to suspend it at that point
Moment
The product of the weight of an item multiplied by its arm. A force trying to rotate something around its point
Standard empty weight
Basic empty weight minus optional equipment
Station
A location in the aircraft that is identified by a number designating its distance from the datum
Useful load
The weight of the pilot, copilot, passengers, baggage, usable fuel. and drainable oil. basic empty weight subtract from maximum gross weight.
how much does one gallon of avgas weigh?
6 lbs
how much does one gallon of jet A weigh?
6.8 lbs
how much does 1 gallon of oil weigh?
7.5 lbs
how much does 1 gallon of water weigh?
8.35 lbs
Where does the CG move as fuel is burned?
Forward
