Propeller Corrosion

[Krusty]

Here's one for the experts to advise on, and perhaps others with experience.

A yacht I know has been left without a shaft anode for almost a year, moored in sheltered tidal waters with incoming freshwater streams which are probably slightly acidic from peat.

The shaft is exposed for only a few inches beyond the sterngland. A shaft anode in that space was removed and replaced by the present rope-cutter: by a boatyard, without offering advice as to possible consequences, would you believe?

The boat is to be moved under her own sail/power to another boatyard. What are the prospects for the propeller's survival, given minimal use during the move?

 

[catalac08]

That looks to be mostly surface de-zincification -why not chip at it and see if it does actually go through the blades anywhere.

I had a prop much worse than yours, with pieces missing all around all the blades and I used used it for a few months until I could afford a new prop.

If you are not going far and with gentle engine use I would expect you to have no problems at all with this.

 

[PCUK]

An electro-eliminator would be a good idea.

 

[Tranona]

Clean it off and "ring" it. If it sounds dull the dezincification is probably more than surface. However from your picture it only looks surface.

No need to have a shaft anode, much easier to use a hull anode bonded to the shaft either through the gearbox with a bridge across the coupling if it is the flexible type, or an electro eliminator (see MG Duff for details).

 

[Norman_E]

Get the Beneteau / Jeanneau type shaft nut and anode.