Prop update

Firefly,

I don't have shorepower, but several boats directly next to ours have this.
Somehow, I don't understand the anode's functioning. Take the propshaft as an example:
The shaft is stainless steel, the prop is bronze (or whatever). I understand that there is a difference is electrical potential between the two different metals but as they are linked together what can happen?
I have always wondered why my boat does not have anodes (except for he very small one on the shaft of the bowthruster). The boat is on fresh water and nothing has happened in the past 15 years but I would like to prevent future problems. Or maybe I really have invented something...

try sticking it in the green stuff, and watch your prop fizz!!!
 
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