Spearfishing from a Thundercat / Zapcat

Ron, I am surprised that more folk dont use thundercats they do seem like a good exciting option.
Re the plastic boats, there are considerable differences between alloy & plastic, the general feel of plastic is warm & forgiving but, mainly it is the sound!
Plastic boats are very quite in the water & generally give a softer ride.
However Rota moulded boats are heavy compared to other materials although you must bear in mind that you do in fact get two boats as they are always double skinned.
Thudercats are plentiful around this end of the world but most are X race boats with tiered engines. There is one for sale just down the road from me, no engine, for £500

I think it depends on the hull shape, the NZ built Mac (or is it Ensign now) have pretty flat bottoms in their smaller boats but generally speaking - yes they would need more power because ally boats are lighter.
I have a 15' polyboat but it has a V hull & only manages 25knots with a 50hp however you dont get beaten up in the same way you would in a flat bottom fast ally boat.
A lot to be said in favour of inflatable cats.....