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SS 201, you're way low on the slip factor at 10%. You are correct that all boats have different slip factors. Rule of thumb on correctly setup lake boats is 10% for hydro's and 15% for flats. I confirmed this with my flat at Bakersfield with an actual timeslip. I spun 6,600 rpm w/ 25% gear and a 15 pitch prop. The timeslip was 100.50 mph.
An older style heavy flatbottom may even have closer to 18-20% slip.
Jocko
 
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