Anodes/Zinc placement and connections

[Edelem]

What should be connected to the sacrificial anodes on a fiberglass monohull? How many are necessary? Im not talking about prop and shaft zincs.

[coopec43]

Originally Posted by Edelem

What should be connected to the sacrificial anodes on a fiberglass monohull? How many are necessary? Im not talking about prop and shaft zincs.

I've yet to research the problem so I can't really help. I've decided to switch to Trudesign (non metallic) through hull fittings so that will take care of one problem.

When I do get around to installing them I'll probably be guided by video clips like this.(I haven't viewed tjis video clip so apologies if it is a dud!)

https://www.youtube.com/watch?v=WO5MPuJxCjw

[GILow]

Originally Posted by Edelem

What should be connected to the sacrificial anodes on a fiberglass monohull? How many are necessary? Im not talking about prop and shaft zincs.

Thats a hard question to answer without knowing a little more about the boat.

But typically you would also want to protect the rudder assembly.

Some boats wire in their skin fittings, though I haven't seen that set-up for a long time.

I have seen engines protected by hull anodes too.

[tkeithlu]

They are bonded into the system, and placed near exposed metal. The number is indeed difficult to predict; ultimately you want -1.0 or so volts between a reference electrode and the bonding. Here's a reference electrode:

https://www.boatzincs.com/corrosion-...electrode.html

As long as I maintain that -1.0V on my steel hull, NOTHING below the waterline corrodes.

[goboatingnow]

Originally Posted by Edelem

What should be connected to the sacrificial anodes on a fiberglass monohull? How many are necessary? Im not talking about prop and shaft zincs.

Nothing, such anodes are directly mounted on the metal they protect. There’s is no point simply attaching one to a grp hull.

[fstbttms]

Originally Posted by Edelem

What should be connected to the sacrificial anodes on a fiberglass monohull?

What is it that you are intending to protect?

[boatpoker]

Originally Posted by Edelem

What should be connected to the sacrificial anodes on a fiberglass monohull? How many are necessary? Im not talking about prop and shaft zincs.

No one can anser that without knowing what boat and what engine and what drive system.