Don't worry much about underpower. Light on the stern is usually better. I ran a 20 seafari(same hull as yours) for years with a old merc 150, often vastly overloaded with divers, 9-10 tanks, multiple iceboxes full of ice/fish etc. It had more power than I needed and no problems at all in maintaining a good cruising speed (25 knots or so). It would hit 40 light. Far more important is a combination of engine, prop, and hull that is able to stay on plane down below 15 knots.12 or 13 can be heaven when it gets nasty.
Last edited by cdavisdb; 01-09-2013 at 10:42 AM.
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