Jerry, there's an all-electric ski boat prototype that has been built and can do 28 ski runs before recharging (not sure what that is in miles or hours). I don't know if you'd be able to find the technical details on it, and they probably spent many tens of thousands on this proof of concept, but it can be done. There is plenty online about the electric Nautique.
http://www.boatingmag.com/engines/alternate%20propulsion/amazing-electric-ski-boat
--- In electricboats@yahoogroups.com, "Eric" <ewdysar@...> wrote:
>
> With a loaded daisplacement of 3500lbs, you're going to be hard pressed to provide enough power to get the boat to plane. With their small engine option being 135hp, I would say that you'll need a motor close to 50hp/38kW (maybe more) to achieve reasonable performance. Even with LiFePO4 batteries, 1000lbs ($18,000) will probably only give you 60 minutes of normal operation. You won't be able to pull a skier.
>
> Using the existing outdrive may also be an issue, I've heard of previous attempts to do so, and the outdrive absorbed a significant amount of the motors's output. Your outdrive might be better, I don't know if the outdrive manufacturers or anyone else has efficiency specs for those units.
>
> Limit your self to slow speeds like your Electrocraft and the project becomes more reasonable.
>
> Eric
> 1964 Cheoy Lee Bemuda 30 ketch, 5.5kW Propulsion Marine drive, 8kWh LiFePO4 batteries.
> Marina del Rey, CA
>
> --- In electricboats@yahoogroups.com, "Larry" <lmills187@> wrote:
> >
> > I would like to convert a boat, like a Four Winns H180, to electric power. I would remove the engine and couple an electric motor to the outdrive. Has anyone attempted to convert a non displacement hull boat to electric? What size electric motor would be required to get reasonable performance? I would use LiFe04 batteries.
> > Any thoughts, other than that I am "crazy", would be appreciated.
> >
> > I currently have an ElectroCraft LS14 electric boat. Since it is a displacement type hull, it is limited to slow speeds. This conversion would be to get something that provides better performance.
> >
> > Regards,
> >
> > Larry
> >
>
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