Originally Posted by beamishken
The weight is a pretty good indicator aluminium is about half the weight of zinc
I think personally I'd go with zinc on an aluminium boat but I'm no expert so maybe worth the op doing some homework to be sure which is best
Good point about the weight thanks, but they weigh practically nothing and I don't have fine scales.
OP said aluminium deck not aluminium hull, I guess we are mainly concerned about the engine.
I once questioned how aluminium anodes could work in an engine that's basically well.. aluminium, but I guess not all alloys are the same and these are designed to be sacrificial.
Pictured: Non-working zinc engine anode after just 218 hours, trailered boat, flushed regularly after use I was told (reliable source).