Wednesday, July 15, 2009

[Electric Boats] Re: Direct drive brushless DC motors now available, (how much is enough)

 

With regard to how much power is enough, 2KW can be, in the right circumstance. I can relate this experience: My Cal 2-34, a boat that displaces 10K pounds (unladen) has a Westerbeke 25HP 4 cyl. diesel that began seriously overheating after we left San Diego for S.F. in 2001. I had to turn around about 25 NM out from Point Loma and after about 10 or 12 hours of running the overheating thing ten minutes at a time, I got tired of it and put the 3HP outboard on the dinghy and quarter-tied it to the boat. Well, the 3HP motor pushed us the next 10-11NM into Shelter Island, back to my mooring. Yeah, the wind was very light, and some of the time the tide was favorable. But the point is it only required the equivilent of about a 1.5KW electric motor to handle that job. If there had been some wind...I would have sailed in. If you have a sailboat, sail, use the best form of energy out there.
Sailonner

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