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
No comments:
Post a Comment