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No, 30hp would be fine. Just make sure your mount can withstand the torque and that you have a high thrust prop. Most outboards are set-up for high speed, not slow sailboats.
Hi Emil - I have a Pahi 42. When we bought her about 10 years ago she had one old Tohatsu 18hp 2-stroke mounted centrally. It works in calm weather! ;-p Now we have 2 lifting pods with one new and one older 9,9hp 4-strokes. MUCH more punch through the waves and turning ability (I know you said you don't need that, we do). If you can find an older yamaha 9,9 high thrust 4-stroke, go for it (IMO)! From what I understand trying to make a regular outboard into a "high thrust" version is not just about changing the prop, though that helps maybe. The gear ratio is actually very different and there is nothing you can do about that.
I'm not sure - I often motor using just one motor. Two are needed for turning in confined harbours (we have a lot of those here in the Baltic) & for motoring into strong head winds.
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