Anodes for my 21 Classic

[harry ames]

The bullet zinc anode for my 1997 21 classic is really ugly. I'll be 90% on fresh water and want to go to aluminum. I can't find a match for my ugly zinc bullet anode that goes over the prop retainer nut. I do have space ahead of the support strut however for a two piece clamp type shaft anode.

Should I continue the battle to find a new aluminum or zinc bullet to replace what was probably factory and placed at the stern end of the prop, or would the collar type ahead of the strut be okay?

 

[SGIDAVE]

The bullet zinc anode for my 1997 21 classic is really ugly. I'll be 90% on fresh water and want to go to aluminum. I can't find a match for my ugly zinc bullet anode that goes over the prop retainer nut. I do have space ahead of the support strut however for a two piece clamp type shaft anode.

Should I continue the battle to find a new aluminum or zinc bullet to replace what was probably factory and placed at the stern end of the prop, or would the collar type ahead of the strut be okay?

Hello Harry,

My 21EC has a 1" diameter propeller shaft which uses size "C" prop nut anode. I buy from Boatzincs.com. Here is their listing of replacement Aluminum propeller nut anodes. This is JUST the anode; they sell the complete kit with new nut, anode and cotter pin too if you need that.

Whether you use the nut or shaft anode doesn't' matter as long as you realize that either require good metal-to-metal contact in order to function properly. That is, if the anode begins to 'dissolve' along the INSIDE where it contacts the nut or shaft, then its function will be reduced. In fact, if it gets loose, it may not be working AT ALL. So, you may need to look/inspect the anodes occasionally to make sure they can still make electrical contact with the boat's metal.

/dave

 

[harry ames]

This anode I have is definitely in the "sponge" category. Thanks for the info. I'll probably replace it with another bullet if there is one in aluminum which I understand is the right anode material for my fresh water purposes.

 

[sheral]

Hi Harry.

You should give this previous thread a read to ensure you have the right type of anode(s).
viewtopic.php?f=5&t=7482

 

[harry ames]

Thanks all for the info. My boating hours average only about 100 per year and 95% are on fresh water. Our longest in-water stays are 7 to 10 days with a month or more between trips. So, lots of trailer time in dry climates. So in general, anodes aren't a big issue for my boating style. But, I do want to keep the boat salt water and longer trip ready as those are on my bucket list. So I do want adequate anodes.

 

[harry ames]

I should say, my ENGINE RUNNING hours are about 100 per year.