Thanks Myles, Jim and Dan,
The reason for avoiding brushes is to eliminated any possible sparks that might ignite combustible gases.
A cogged belt seems to be the easy way out but if I could find a compact direct drive DC motor that provides 5kW at 1500rpm I would be delighted. Any hints?
Surfing the net I found an interesting 6hp electric outboard motor from ecycle - check this one out. Ready to plug in.
http://www.ecycle.com/docs/eCycle_electric_outboard_62010.pdf
It will probably not regenerate which is a desired feature.
--- In electricboats@yahoogroups.com, "Myles Twete" <matwete@...> wrote:
>
> Then of course there are the thin multi-ribbed belts common on most modern
> cars for driving alternators, fans, compressor, etc. They are probably not
> good enough for several HP, but for 2HP or less, probably they're okay.
>
>
>
>
>
> From: electricboats@yahoogroups.com [mailto:electricboats@yahoogroups.com]
> On Behalf Of danbollinger
> Sent: Thursday, October 14, 2010 3:14 PM
> To: electricboats@yahoogroups.com
> Subject: Re: [Electric Boats] Electric drive units
>
>
>
>
>
> It is impoertant to make the distinction between vee belts and cogged belts.
> The latter are a significant improvement over other belts and even gear
> boxes, to me. Belts will work when submerged and don't need their oil
> checked or changed. Of all the cogged belts, I find Goodyear Eagle GT
> herringbone belts the best. They transmit more power, are more compact, and
> quieter than other cogged belts.
>
> --- In electricboats@yahoogroups.com
> <mailto:electricboats%40yahoogroups.com> , "luv2bsailin" <luv2bsailin@>
> wrote:
> >
> > I concur with Miles.
> > Belt drive technology has come a long way in recent decades too. For
> instance look at the main drive belt on a Harley. When I sold my last one at
> 50,000 miles the belt showed very little wear, and my current bike is on
> it's second belt at over 100K.
> > Also, having a reduction drive allows you optimise the setup for your
> particular hull/prop/battery combination.
> > Brushless motors have some advantages (generally quieter and slightly more
> efficient) but the controllers are more complicated and expensive. Whatever
> way you go, a well engineered system will go many years with almost zero
> maintenance.
> > Jim
> >
> > --- In electricboats@yahoogroups.com
> <mailto:electricboats%40yahoogroups.com> , "Myles Twete" <matwete@> wrote:
> > >
> > > Brush and belt replacement hassles are overrated: I've been running now
> with
> > > the same brushes since 2002 or so. It'll likely last another 6 or 8
> years
> > > before needing the 2nd or 3 sets I have.
> > >
> > > Re. 12v: 36-12v DC-DC converter---not expensive yet efficient---good for
> > > 300watts or so in my case.
> > >
> > >
> > >
> > >
> > >
> > > From: electricboats@yahoogroups.com
> <mailto:electricboats%40yahoogroups.com>
> [mailto:electricboats@yahoogroups.com
> <mailto:electricboats%40yahoogroups.com> ]
> > > On Behalf Of gstranne
> > > Sent: Wednesday, October 13, 2010 12:26 PM
> > > To: electricboats@yahoogroups.com
> <mailto:electricboats%40yahoogroups.com>
> > > Subject: [Electric Boats] Electric drive units
> > >
> > >
> > >
> > >
> > >
> > > Hi members,
> > > I am new to this group and intereseted in your experiences with electric
> > > drives for sail boats. There are several suppliers capable of providing
> > > complete inboard packages for up to 48VDC or even up to 72V.
> > >
> > > I have checked SolidNav, Electric Yacht, Advanced Marine, Propulsion
> Marine
> > > and ASMO.
> > >
> > > I would prefer a "maintenence free" system, i.e no brushes or belts to
> > > replace. Please correct me if I am wrong but it seems that Advanced
> Marine
> > > can offer that. Has anyone used such a system?
> > >
> > > How did you solve the need for 12VDC for the rest of the boat?
> > > Did you tap that circuitry into one of the series connected 12V drive
> > > batteries?
> > >
> > > Any comments to this would be appreciated?
> > >
> > > Gunnar
> > >
> >
>
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