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Dave Ullrich
OK, I'm VERY bad at advanced math. I'd like my Cat 30 to cruise around 6.5 knots under power with power leftover to pound into a headwind. The boat weighs about 11,000 pounds. It has a waterline of 25 ft. This should provide a hull speed of about 6.7 knots, so my idea is possible with enough power. So how much power would I need? Right now I have the little 11 hp Universal 5411 and a 2 blade prop and it provides a cruise speed of about 5.5-5.7 knots and a top end around 6.0-6.3 knots. But from what I've seen here, others with a LOT more power don't go any faster than I. Is something wrong with their setup, or do you just need a huge power increase to create a small increase in speed?