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340 - EASA Drone A2 License - How does ice accumulation directly affect a drone's propellers?

Question 340 - Meteorology - EASA Drone License A2

It improves the propeller's aerodynamic efficiency by smoothing scratches
It keeps the motors cool, allowing for faster flight
It has no effect unless the ice is more than 5cm thick
It alters the airfoil shape, drastically reducing lift and increasing drag, while uneven ice shedding causes severe, potentially destructive vibrations

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