Gerry,
Vendor alert. Welcome to the user group. The semi displacement hull is not as effecient at slow speeds as the full displacement hulls that most of us on this website talk about. There are several with good working knowledge such as the Arc. We are starting to see a growing interest in electric propulsion by the power boat market but most are unreasonable expectations. You can not push a 20000 pound sportfisher with an electric motor at 10kts but you can do some reasonable smaller runabouts and service boats at speeds in the 5 to 8kts. I am sure the other vendors that visit this site will also give you expert advice. We are all dealing with the same physics and the power to push a boat will be the same for all of the systems within a reasonable amount. System design and engineering will also play a part in the effeciency.
To give you an expectation that is reasonable, think in terms of what you know about the current propulsion system. This is including the motor, the propeller and the hull. If you have a 50hp gas/diesel motor pushing the boat today that meets your needs of displacement speed and reliability in your environment, than it is reasonable to look at electric systems from several vendors. Share the following information and I am sure several vendors will respond:
Length at Waterline
Beam
Displacement (include passenger loads)
Propeller
and finally speeds at current propeller RPM would be helpful to know.
We wish you the best with your mission and works.
Regards, Mike
Electric Yachts of Southern California
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