My experience with a DF140 on my bracketed 20SF is 19 pitch would be a good starting point. I have a Solas Amita 4 13.75X19P on it right now, with a light load, 6200rpm and 36kts/41mph. I also had a Powertech PTR 3 blade SS 13.5x18P, my motor was too low, but it still would turn 6300. I raised the motor and had it repitched to 19P, still turns 6300 rpm.
Strick, you have a PM.
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1973 Seacraft 20' SF "Sea Dog"
1988 Tracker/Seacraft 23' WA "Salty Dog"
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