Realy not that bad of an Idea for a sail boat if you put the cooling circuit in the keel and not in the hull. a lead keel with a some sort of compatable metal
cooling grid cast into it would be a good thing. No drag like a conventional keel cooler. and would get the cooler into deeper water where its always colder.
put in a condensing circuit and you have a better refrigeration or A/C.
Maybe better to cast the keel out of steele and hang some lead on it.
s\v Soul Searcher
All boats are sinking it's just a matter of how fast.