cep, i think you have brought up a very good point as far as most boats lacking speedometers. if would suggest following someone that has a speedometer and seeing what your tach reads (150 ft away of course). another thing we used to do for skiing was to put a mark on the throttle control itself that indicates approxiamate speed.as for your question, we had a 21ft sweetwater pontoon with a 90 horse yamaha. it would hit 30 on a good day.
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