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Range is the total distance traveled by an aircraft on a tank of fuel.
Endurance is the total time in air for a tank of fuel.
For cruising level flight these are cruise range (X) and cruise endurance (E) . An important parameter is the specific fuel consumption (c). Range and Endurance calculation follow similar steps and hence are discussed together. The final form off the relational are called as the Brequet Formulas
Range Calculations
For Range:
1. Higher (CL/CD)higher range
2. Lower c higher range
3. More fuel consumed more range
4. Maximum range at maximum aerodynamic efficiency.
This is true for general aviation aircraft.
For level flight maximum aerodynamic efficiency occurs
at minimum drag speed.
For Endurance:
Higher (CL^3/2/CD) longer Endurance
2. More S longer Endurance
3. Lower altitude longer endurance
4. Lower c longer endurance
5. Max Endurance for maximum (CL^3/2/CD) .
Flight at minimum power yields a maximum of the above ratio
6. More fuel consumed leads to larger endurance
To compute Cruise Range - use (CL/CD) at cruise in the formula
Endurance Calculations:
To compute Cruise Endurance use (CL^3/2/CD) at cruise in the formula
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