John,
Good info. However, Neil want's to be able to run at 8.5kts with the same motor, batteries and prop as well as long distance. Like you, I can give advice on how to achieve either one of those goals, but not both with the same system.
Fair winds,
Eric
Marina del Rey, CA
--- In electricboats@yahoogroups.com, John Paramore <watertoyz@...> wrote:
>
> I think you might want something like the Utility Marathon boats from
> the early '90s. Rules limited competitors to 125 pounds of lead/acid
> batteries...2 batteries aboard, one ashore for pit-stop change-outs.
> The initial marathon ran 12 hours with the winner turning about 72
> miles. The next was reduced to 6 hours, but competitors turned up the
> amperage wick to run the same distance.
>
> The most successful boats were long slick hulls running 1 hp Bosch
> premanent-magnet motors and big slow turning props. The Cloud/Mischke
> winner ran a U-jointed shaft to make clearance for a 14 inch peddle-
> boat propeller...think airplane prop...that turned at about 300 to
> 500 rpm. The NOPEC runner-up initially ran a huge marine three-blade
> wheel, maybe 10 inch diameter with lots of pitch, and used chain-
> drive gear reduction. Later they switched to a custom made tractor
> outboard with a three-blade aero-prop. I'll send some pictures off-list
>
> John
>
> On May 19, 2011, at 7:35 AM, F Neil Simms wrote:
>
> >
> > .... What I'm looking for is a motor configuration that will drive a
> > light, long boat (24' x 2' at WL, under 500lbs all up) at high
> > efficiency (90%+ for the motor), with prop speeds in the 300-700
> > rpm range. I would like this boat to be capable of both high speed
> > (relatively, say 8 to 10 mph) at around 1 to 1.5 kilowatts, and
> > long distance cruising at very low power levels - 50 to 100 watts....
> > Any suggestions?
> >
> > Neil S.
> >
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