T-Pain Is On A Boat: Re: [Electric Boats] Re: Repowering a 65 motor sailer

Saturday, January 15, 2011

Re: [Electric Boats] Re: Repowering a 65 motor sailer

Yes, rough seas, a very good reason for electric propulsion, that being the Thrust delivered provided by the Torque of a low rpm large wide prop, everything balanced and efficient for 68000lb displacement hull.

http://biankablog.blogspot.com/ Captain Mike has a great story, scaled down, but the issues are similar.

A 30' 26,000 lb displacement hull, an improved BMS would lower his fuel consumption even more, and perhaps a wheel change.

In a message dated 1/15/2011 4:30:03 A.M. Eastern Standard Time, boat_works@yahoo.com writes:

THanks Nicolas, I understand that you don't need to run under battery power alone, so you won't need a huge battery bank for propulsion.

You will, however, need a much larger genset. I don't see how a large diesel genset powering an electric motor will help you meet your design goals of minimizing spares, serviceabilty in remote areas, efficiency (refer to Nigel Calder's articles on hybrids in Professional Boatbuilder) and reliability. I do admit that removing and replacing the current 160HP ICE with another model engine will be a big project.

Don't get me wrong, I love electric boats. I run one, and wouldn't ever change it to ICE, but some applications make more sense than others.

I'd be happy to be proven wrong, and look forward to following this discussion.

-Tom

--- In electricboats@yahoogroups.com, Nicholas Oberzire <ibles_world@...> wrote:
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> Tom the Gen Set would be running when the motors are running, but its only 12.5kw so pulling 60k out for a motor wouldnt be long before I had batterys would be defeated, the motors need to be run hours on end and not just to back it up on a dock, it is a sail boat, but when the seas are rough I be motoring more than a bank of batteries can hold
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> --- On Thu, 1/13/11, Tom <boat_works@...> wrote:
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> From: Tom <boat_works@...>
> Subject: [Electric Boats] Re: Repowering a 65 motor sailer
> To: electricboats@yahoogroups.com
> Date: Thursday, January 13, 2011, 5:03 PM
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> I may have missed it somewhere in this thread, but I don't recall: Is the boat intended to be run under battery power alone (no genset running), and for how long?
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> -Tom
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> --- In electricboats@yahoogroups.com, GNHBus@ wrote:
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> > I was looking at Baldors yesterday, this would take @ 40-50kw , do you have
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> > more infos on this Hans?
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> > In a message dated 1/12/2011 8:35:29 P.M. Eastern Standard Time,
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> > hanskloepfer@ writes:
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> > If redundancy is what you are looking for have you considered an
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> > industrial ac motor like a Baldor. I have seen large yachts which have a large
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> > industrial Baldor or similar motors belted to the existing prop shaft. This is
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> > just a simple method of providing some redundency. It would perhaps require
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> > a larger generator, but this could be used for other power hungry AC
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> > Just a thought.
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> > Hans K
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