Maximum Endurance Speed Calculator
Calculate the speed for maximum time aloft with available fuel.
Quick Reference
| Aircraft Type | Max Endurance Speed |
|---|---|
| Propeller | 1.0 to 1.1 x Vs (L/D max) |
| Jet | 1.316 x Vs (min drag speed) |
When to Use
- Holding pattern operations
- Search and rescue loitering
- Waiting for weather improvement
- Emergency fuel conservation
- Surveillance operations
Understanding Maximum Endurance
What is Maximum Endurance Speed?
Maximum endurance speed is the airspeed at which an aircraft can remain airborne for the longest time with a given fuel load. It minimizes fuel consumption per unit time (not per distance).
Propeller vs Jet Aircraft
Propeller Aircraft: Max endurance occurs at minimum power required, which is at L/D max speed (approximately 1.0 to 1.1 times stall speed).
Jet Aircraft: Max endurance occurs at minimum fuel flow, which is at minimum drag speed. This is approximately 1.316 times stall speed (the 4th root of 3 multiplied by Vs).
Weight Effect
The endurance speed changes with weight. Lighter aircraft have lower endurance speeds. The formula is: V2 = V1 x sqrt(W2/W1)