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, "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@yahoogroups.com]
> On Behalf Of gstranne
> Sent: Wednesday, October 13, 2010 12:26 PM
> To: electricboats@yahoogroups.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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