How are you going to use the boat? If it's every now and then when it's calm wind and water you want to move it that's one set of issues. If it's I want to go cruise this thing days at a time that's another set of issues. Once you know the hull type, length and weight you can get an idea of how much power you need to move it. Even a small amount of power will push a large vessel at slow speeds but it takes a lot of power to accelerate or stop it. Wind and currents can also require a lot of power to overcome. I think that once you know how you plan to use the vessel and what the layout and size of it is the question of how to power it will be easier to answer. The other question would be what are the reasons you want to go electric. Just to give you an idea; 5 hp would push my Catalina 30 4.5 kts. in calm wind and water. Weight was about 15,000 lbs. 15- 20 knot winds on the nose would stop it dead or blow it backwards. At very low speeds the shape and type of the hull does not matter as there is so little resistance or skin drag. As speed increases the effect of resistance and skin drag increase in importance.
Thinking out where you want to go and how you want to get there is half the fun of a voyage.
Capt. Bill
From: Aaron Costic <aaron@elegantice.com>
To: electricboats@yahoogroups.com
Sent: Tue, November 2, 2010 6:21:28 PM
Subject: RE: [Electric Boats] Re: house boat + hybrid
You are right, I was thinking of an all electric drive rather than a
hybrid. With a gen set as a back up to charge the batteries. It would
probably take a pretty hefty battery bank & 2 large electric motors to
safely power the houseboat. Top speed isn't important. A range of 3-4
hours at 8-10 knots would be adequate. Do you think the technology is there
now?
Aaron Costic
Elegant Ice Creations
www.ElegantIce.com
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