He's referring to a motor similar to the Mars PMAC sold by Golden Motors
--- In electricboats@yahoogroups.com, "Myles Twete" <matwete@...> wrote:
>
> Curious: What is this "Golden" motor you refer to?
>
>
>
> From: electricboats@yahoogroups.com [mailto:electricboats@yahoogroups.com]
> On Behalf Of Colin
> Sent: Monday, October 11, 2010 9:19 PM
> To: electricboats@yahoogroups.com
> Subject: [Electric Boats] Re: Some photos uploaded
>
>
>
>
>
> I've got a PMDC 5KW Golden motor that I intend to match via a spider, to a
> Hurth ZF boat gearbox too. It also has the enefit of a forward or reverse
> gear if one becomes noisy or clutch slipping (manually change gearbox but
> use motor forward/reverse function.
>
> Unlike you, I don't have a bell housing, so it will be a bit more work to
> combine the motor to the gearbox and two shaft drives. I'll be very
> interested in how you find your system.
>
> I've used liquid teflon (Nulon) in gearboxes before but that's without
> clutches. So I'll stick to normal fluid.
>
> Like you I think the slight losses will be made up for by designed thrust
> bearings and easier remounting to shaft.
>
> All the best and keep us informed - interesting project
>
> --- In electricboats@yahoogroups.com
> <mailto:electricboats%40yahoogroups.com> , "goldsmithfoil" <suntreader@>
> wrote:
> >
> > I just uploaded a couple of pictures of my MARS PMAC motor mated up to a
> Kanzaki transmission from the Yanmar 2QM removed from the boat. I cleaned up
> the transmission, painted it and used an aluminum plate to mount the motor
> to the bell housing in such a way that a spider coupler on the transmission
> input mates to the motor drive shaft.
> >
> > I have a Kelly controller and controls on order. I'm planning on
> installing it in a case mounted on top of the back of the gear box, so the
> whole drive is in one more or less self contained unit.
> >
> > My thinking in using the gearbox is it will be a very robust and reliable
> reduction gear and installation should be the same as any engine. I replaced
> the engine beds with similar but much shorter ones in the boat.
> >
> > I do have a question about efficiency. There is some effort in turning the
> transmission. I've been inside this type of gear box and its pretty much
> just two shafts with gears, nothing to it. The efficiency of mechanical
> gearboxes should be very high, in the 90% and up range, comparable to belt
> reduction, but the initial effort in turning the output shaft makes me
> wonder. Is it just that once the gears get running they are very efficient?
> Is there a fly wheel effect going on?
> >
> > I'll update with pictures of the controller installed and installation in
> the boat when the time comes.
> >
> > David
> >
>
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