Shaft anode

[weaver_fish]

Had a look under the boat with a mask and wetsuit yesterday and there is a loose disc of zinc flopping around on the shaft. Obviously it needs replacing. However, as it is a folkboat there is not much shaft visible between the stern and the prop. Is there a special kind of anode that is thinner? HAd a look on the web and could only find ones that are too big for the gap.

 

[MoodySabre]

What you need is a collar anode like this:

http://www.zincsmart.com/list11.htm

 

[eyehavit]

Why not investigate anode to fit shaft aft of propeller?

 

[captncruise]

My prp is in an aperture and don't have a lot of space so I have cut down an anode on the band saw. Unfortunately they do get loose as they wear.
I also have an anode on the fibre glass hul which has a heavy copper wire which is twisted loosely around the shaft inside boat.
Bewtween them they protect my valuable prop

 

[eyehavit]

If the shaft is electrically contacted to an anode mounted on the hull and remains permanently underwater my understanding is your propeller is protected.