How to keep the bearings of the turbine dry

[ThomasS]

If bearings get wet, they will only survive for a few months.

Depending on how small you make the gaps, you might not need a shaft sealing ring.

Shaft sealing rings add drag, and they wear out over time, and need to be replaced.

This design has been working well for many years in Papua New Guinea,

Credit: Gerhard Schuler