I have a pair of 10kW 48v Motenergy PMAC motors from Thunderstruck on my 12m cat Sunshine. Since this was a repower I had good trials data from 3 sources: 1) tank test. 2) first trials with 25kW motors. 3) final trials with diesels & 7kW motors.
looking carefully at all the data up to max speeds resulting from 10kW/motor - prop sizes and prop rpm - I was able to make my choices for reduction (3:1) & prop size (18”x14” 3-blade).
during sea trials we were able to max out rpms at 2,400 (motor RPM) AND amps at 200. Speed was 6.3 knots. I feel our max cruise is 6 knots - we seldom go faster than 4 knots.
the reason the tank test and original trials had better performance is they were both done with “as designed” displacement. the final boat was quite a bit over weight - thus the less efficient performance. If I were to build another, I’d make sure we hit our target weight - that would result in a 7 knot cruise speed with the same pair of 10kW motors.
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