Actually, I'm more interested at this point in doing preliminary design planning. Does it make any sense at all? My 5.7L V-8 has max torque around 300 ft lbs at around 3,000 RPM. HP peaks at around 4,000 RPM at around 215 HP. It has a 99 gal fuel tank that would provide plenty of room for a battery bank. Based on my positive experience with an EV, I think I can get by with far less torque (and horsepower, too) from an electric motor, but I lack the skills to do a simple, back of the envelope calculation of how much power and torque I'll need. It would be nice to occasionally achieve a plane for short periods of time and to have a total endurance of maybe 3 or 4 hours, most of it at hull speed. Does this make any sense at all using a typical LIFEPO4 battery pack, and motor/controller similar to those the EV enthusiasts are using? The boat is pretty big (26 foot Sea Ray Sundancer) and it may just be totally in-feasible.
--- In electricboats@yahoogroups.com, "Reid" <axius@...> wrote:
>
> Dave,
> There is a stock Mercruiser drive which mounts the gas engine midships and uses an automobile type drive shaft to the rear. This system is shown in most Mercruiser manuals. This may be easier than trying to support an electric motor off the 2 spring mounts on the transom plate, plus a support from the front motor mounts?
>
> --- In electricboats@yahoogroups.com, "oldgoat1968@" <dcsteere@> wrote:
> >
> > Brent, I'm very interested in this conversation. I, too, have a 1985 26' Sundancer with a 5.7L V-8 Mercruiser inboard-outboard. Mine is a B-2 outdrive, a conversion from the original B-1 model. I have completed an EV project on a 95 Acura Integra. I used a 3 phase AC motor (AC-50) which is conservatively rated at 59 HP and it has plenty of torque and power to push my car along quite nicely. Economy is excellent, too -- a measured 2.6 cents per mile over about a six month -period (a little over 3,000 miles). My thought is that a similar sized motor might be sufficient to drive my big boat. Not trying to win races here, but occasionally getting it up on plane would be a goal. Seems to me it would be relatively easy to configure a motor mount for a 9 inch motor and an adaptor plate/hub arrangement that would mate to the splined shaft coming out of the Mercruiser. Anybody every try such an arrangement?
> > Dave
> >
> > --- In electricboats@yahoogroups.com, "mattelderca" <mattelderca@> wrote:
> > >
> > > There are some brilliant guys in the Netherlands that frequent this group.
> > > http://www.newelectric.nl/
> > > Although not as big a project as yours, their install would scale up a bit and fit well depending on your expectations. Not sure if you could run around at planning speed for any real length of time, but low cruising speeds should prove very doable. Be sure to watch their Youtube videos, as they say a picture is worth a thousand words.
> > >
> > > http://www.youtube.com/user/NewElectricPowerboat/videos
> > >
> > >
> > >
> > > --- In electricboats@yahoogroups.com, "brent.jaybush" <brent.jaybush@> wrote:
> > > >
> > > > Has anyone attempted or been successful converting a fairly large stern drive to electric drive?
> > > >
> > > > I have a 1979 26 ft. SeaRay powered by a Mercruiser/Chevy 260 HP 350 CU V8 gas hog with a 100 gallon tank for the black gold.
> > > >
> > > > Just beginning to research the possibilities. Certainly no shortage of space for batteries.
> > > >
> > > > Edison Marine has created a large 17' runabout with enough powering for hull speed, so it seems it should be feasible, perhaps with limitations.
> > > >
> > > > I already run it around MDR at a sea snail's pace using a surplus trolling motor on the swim step, so a proper EV design should do far better, but achieving plane speed is probably out of the question.
> > > >
> > >
> >
>
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