Why use multi-bladed props?

Описание к видео Why use multi-bladed props?

What effects to blade size and blade-count have on the efficiency and performance of a propeller. In this video I also look at the trend to use three or four-bladed props on mini quadcopters (racing drones).

The video on ducts and prop efficiency referred to can be seen here:    • How ducting a propeller increases eff...  

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