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Efficiency is reduced because the propeller exerts less force at high density altitudes than at low density altitudes.
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Efficiency is reduced due to the increased force of the propeller in the thinner air.
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Efficiency is increased due to less friction on the propeller blades.
UAV CampusAdministrator
What effect does high density altitude, as compared to low density altitude, have on propeller efficiency and why?
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Efficiency is reduced because the propeller exerts less force at high density altitudes than at low density altitudes.
Density Altitude is the altitude corrected for non-standard pressure and non-standard temperatures. A high density altitude means your UAS will “feel” like it’s operating at a higher altitude, hence the performance will be diminished.