Re: How Low Can We Go? (hp)
It sounds like you are going to be unhappy with any engine unless it's not in the water when you aren't using it. Removing and reinstalling it is going to be a pain regardless of weight. I would see what I could do to keep it tilted far enough to be out of the water.
I wouldn't go with less hp than the Tohatsu. It weighs less, but in your situation I would want at least 6-8 hp.
Alternatively, you could investigate a yuloh. If It's good enough for the Pardeys and a gazillion Chinese ----
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40' Norman Cross trimaran