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Efficiency of propeller with Wind perpendicular to rotation axis

Engineering Asked by CoffeDeveloper on May 10, 2021

What happens to air flow and propeller efficiency if it is moving with Wind perpendicular to rotation axis.

The air is blowing in a direction lying on the Planet of the tips.

One Answer

If the wind is near perpendicular to the propellers axis it will make it turn and creat lift. It is called a gyrocopter. Usually, another fan on the back provides the thrust and the big near-horizontal disk creates the lift.

But if you position a propeller in the exact perpendicular wind it loses the lift and will stall.

Unless one designs a custom profile blade specifically designed for maintaining lift under wind coming from a tangent plane. But even then building directional control, authority, efficiency is a different ballpark.

Answered by kamran on May 10, 2021

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