As a result of the propeller exerting less force at high density altitudes than at low density altitudes, efficiency is decreased.
The amount of air being driven through the propeller's revolving blades determines how much thrust is produced. Propeller efficiency declines with decreasing air density.
Since an altitude with a high density has an adverse effect on an aircraft's performance. It lessens lift, degrades propeller performance, and consequently decreases thrust. The power output of the engine can also be reduced by high density altitude.
What is propeller efficiency?
The ratio of engine horsepower needed to turn the propellers compared to engine horsepower needed to generate thrust or brake power is called propeller efficiency. Frictional losses typically account for 20% of the brake horsepower, leaving 80% of the brake horsepower for thrust.
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