--- In electricboats@
>
> At 09:36 AM 14/11/09, you wrote:
> >Hi all.
> >Have you found a supplyer of a suitable gear?. Most motors are running too
> >fast to use the existing propeller.
> >
> >Victor
>
> G'day Victor, All
>
> The Australian Maritime College project vessel "Greenliner" that I've been
> involved in uses a toothed belt to speed reduce by 2.5:1.
>
> 4kW out of the motor at 4500RPM (max) so about 1800RPM into the water jet.
> Belt is about 1-1/2" wide and has not given them any problems (but being a
> project vessel it hasn't had that much run-time either).
>
> The choice of belt & pulleys was made so that they can change ratio -
> before they did the efficiency experiments they didn't know what would
> provide the best efficiency - the first year they ran 1:1 and just tried
> three different jet impellers until they got the best of those three, the
> second year the student looked at efficiency and ended up with the 2.5:1
> ratio and an impeller that would normally be used in a 60hp application.
> (The water jet is in part sponsored by the jet manufacturer, as an
> investigation into non-traditional/
>
> The local bearing supply outlet had no problems getting the belts and pulleys.
>
> Hope this helps
>
> Regards
>
> [Technik] James
>
Hi James.
I believe that belt and pulleys would work fine, but I would have to make a lot of bits and pieces, and still buy a lot of items.
I have a sailboat, so a water jet will not work well.
Victor
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