| Something like this: http://cgi.ebay.com/Baldor-60-hp-EM2547T-Motor-MOT2076-/390074607407?pt=LH_DefaultDomain_0&hash=item5ad242272f Years ago I saw a picture of a commercial boat which had a motor like this belted to the existing propshaft. I think it was just for emergency operation in case the primary engine failed or maybe to troll at low speeds with better fuel efficiency. I don't think it ran off of a battery bank. I also don't know if there was any VFD, reversing, or speed control device. These motors are often 220V and higher. Also often 3-phase AC, but I think you can find just about anything. The only boat I have seen personally with an industrial electric drive is the Hornblower Hybrid in SF Bay. I met the engineer who repowered the boat with the drive system. If I remember correctly they used a large 3-phase 480VAC motor which was normally used to operate large fans for underground mining ventilation. It ran off of large generators or for a very short time off a battery pack and an inverter VFD. Interesting, but pretty complex, cumbersome, and heavy. The company, Hornblower, built the boat to placate the city of San francisco to have a "green ferry" as a condition for being awarded the Alcatraz ferry service contract. I think it is interesting technology, but I am kind of skeptical about its green credentials. It has two vertical axis wind generators and 2 or 3kw of solar panels. Under ideal circumstances I guess about 4 to 5 horsepower green power contributing to 1000hp in diesel generators. Less than a half of a percent, but that's just a guess. That said I guess you have to start somewhere. Good luck with your plans. Cheers, Hans K. --- On Thu, 1/13/11, Tom <boat_works@yahoo.com> wrote:
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