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For the 5.7 300 hp Merc WOT should be at 4800-5000 rpm. We are WOT at 4600. I am talking to Power Tech about a new prop. I will post results in a couple of weeks.Just had my boat out tonight with my GPS on.
My prop is a Quicksilver Thunderbolt 5004 R15.5 x 17P.
At full throttle and prop trimmed up nicely my tach shows about 4400-4500 and a top speed of 38.6mph (GPS reading).
Does this sound about right to anyone, especially the prop pitch and diameter?