The power/speed curve shows empirical sea trial data plus tank test. Originally we had 75HP Steyr diesels with 7kW motor/generators driving props thru ZF Saildrives.
I replaced that system with a pair of 10kW PMAC 48v motors with 3:1 reduction and straight shafts.
convert current HP motor to kW and you may get some info from these curves. The red line is from sea trials when brand new. The Ossa curve is at design weight and matches tank test closely.
Sunshine is a 12m cat weighing a bit more than 20,000#.
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