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

Tom,

The main reason to replace the motor is that it has a lot of hours on it, It was impeccably maintained until the last owners, and then they thought 500.00 per year was a lot to pay for the entire maintenance of the boat...The Mechanics all were impressed the the motor and other systems were in such great shape even with the lack of upkeep. So as I spend countless monies to make this boat more reliable, I figure that I will install a new propulsion system, weather its electric on another ICE, I would prefer electric, but it may not be the right time due to technology. As I run the numbers I cant seem to even get the current ICE to spec out, its coming in with a 33" prop, The calculator Im using keeps telling me that its supposed to have a 21" prop... or a 350 hp motor to run the current one, can some one do the prop numbers, im 70000 lbs, 60' LwL 15' beam 160 turbo diesel, I run it between 2600 - 2800 rpm, it has a borg warner trans, and a 33" Maxiprop Full Feathering. and do 7-10 knots

Nicholas

--- On Sat, 1/15/11, Tom <boat_works@yahoo.com> wrote:

From: Tom <boat_works@yahoo.com>
Subject: [Electric Boats] Re: Repowering a 65 motor sailer
To: electricboats@yahoogroups.com
Date: Saturday, January 15, 2011, 9:29 AM

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:
>
> 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
>
> --- On Thu, 1/13/11, Tom <boat_works@...> wrote:
>
> 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
>
>
>
>
>
>
>
> Â
>
>
>
>
>
>
>
>
>
> 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?
>
>
>
> -Tom
>
>
>
> --- In electricboats@yahoogroups.com, GNHBus@ wrote:
>
> >
>
> > I was looking at Baldors yesterday, this would take @ 40-50kw , do you have
>
> > more infos on this Hans?
>
> >
>
> >
>
> > In a message dated 1/12/2011 8:35:29 P.M. Eastern Standard Time,
>
> > hanskloepfer@ writes:
>
> >
>
> >
>
> >
>
> >
>
> >
>
> > If redundancy is what you are looking for have you considered an
>
> > industrial ac motor like a Baldor. I have seen large yachts which have a large
>
> > industrial Baldor or similar motors belted to the existing prop shaft. This is
>
> > just a simple method of providing some redundency. It would perhaps require
>
> > a larger generator, but this could be used for other power hungry AC
>
> > appliances.
>
> >
>
> > Just a thought.
>
> > Hans K
>
> >
>