What is the proper airspeed to fly for endurance?

When flying for endurance, operate the helicopter at the speed using the least amount of power.Diagram showing best possible endurance for helicopter performance

To stay in the air for the longest amount of time, power use must be at its minimum in order to conserve fuel.  When looking at the horsepower required curve, the best speed for endurance is the speed that corresponds with the bottom of the curve.  This speed does not correlate with the lowest drag.  The speed for endurance will be slightly less than that needed for range.


Principles of Helicopter Flight, 2nd Edition, pg. 111

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