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The foldable propeller has less water resistance.
Some sceptics say that it only get you one knot of extra speed. Only ? That is 24 miles per day extra !!! For that reason, racing machines like Kingfisher have one.

There are several brands : above a picture of the Gori propeller.
On the right you see a Geartec propeller.

The hub of the Gori Sail-drive propeller is manufactured with a flexible bushing that absorbs shock and electrically insulates the propeller from the Sail-drive leg. The hub has the same diameter as the hub of the saildrive, so there is a very nice streamline.

The blades unfold at a very low speed (try it at a boatshow). The propulsion is very efficient, even in the return position.

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