Important to have a lightweight propeller to protect the gearbox of a Rotax engine

Comparison of gearboxes, one with a heavy propeller, the other with a light propeller. VIDEO :

E-Props are the world’s lightest propellers.
To understand why these propellers are ultra-light, and why the lightness of this equipment is essential:
=> See explanations here : E-PROPS: ULTRA-LIGHT PROPELLERS