On 29 nov 2016, at 18:05, mike@electricyachtssocal.com [electricboats] <electricboats@yahoogroups.com> wrote:
The boat was designed to perform with a 75 to 115hp outboard and has a deep V hull. This is what my 48v computer model shows with a motor system up to 5kW (a 24v system would perform with the same wattage:
Kts Amps Watts 1.6 5 240 3.2 10 480 4.1 20 960
5.1 40 1920 5.9 60 2880 6.4 80 3840 6.9 100 4800 Hull speed 5.19
Seems like a quality motor above 2kW would serve you well with your stated 5 to 7 kph with some reserve power. Not sure what you mean by efficiency as the rated power of the motor should perform as advertised.
This is very helpful, thank you. And it makes me think that my little project is practicable. By efficiency I meant the ratio between the propulsive power applied to the boat and the electric power that goes into the motor, so mainly propeller efficiency. From your data this appears to be somewhat higher than I expected. The numbers for 1.6 Kts seem a bit out of line with the rest: I would expect the power to be much less than half the power for 3.2 Kts.
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Hans Rijnbout
Utrecht, Netherlands
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Posted by: Hans Rijnbout <jrijnb@xs4all.nl>
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