The Lift-to-Drag ratio is a measure of the efficiency of an aircraft in generating lift compared to the amount of drag it produces. A higher  ratio indicates a more efficient aircraft, as it means that the aircraft is producing a greater amount of lift relative to the drag it is experiencing. This ratio is often used to assess the performance and efficiency of an aircraft. The formula for Lift-to-Drag ratio is:
Where:
- L/D is the Lift-to-Drag Ratio.
- E is the Endurance in sec.
- W0 is the Gross Weight in kg.
- W1 is the Weight without Fuel in kg.
- TSFC is the Thrust Specific Fuel Consumption in Kg/N*s.