centrufigul jet dirve

[skyrunner06]

hey everyone im pretty new here but i have been involved in boating all my life
i receantly had an idea for a new jet drive system involving a centrifigul pump instead of an impeller for those of you who have never heard of one its like a water wheel that spins around like an impeller on its side. they use them at silver mines becuse they can get the water pressure to like 25000 psi and i was thinking that it may be feasable to make one small enough to fit in a jet ski and still have the same or better preformance? any thought on this one

[redtech]

theres a lot of options out there. the pump in your ski is a centrifigul pump it just uses a differant style of impeller. you ski is most likely a mixed flow pump were as the pump your talking about is a radial flow pump most likely in stages
the more stages the more pressure but the horsepower needed
the big question would be can this be made small enough and still develope pressure to get the speed you're looking for.
simply pressure is made by the shape of the impeller housing a lone
good luck don't give up yet you my have something

[stonebreaker]

Already been done.

[redtech]

stonebreaker as it has already killed the cat just would like to know who and what was the resolutes

[stonebreaker]

Centrifugal technology is old hat - they've been using them in boats at least since the 50's, and most outboard jet units are centrifugals or mixed flow units.

Here's a pic of an outboard unit I found by googling "outboard jet" image:




And this site gives a pretty good history of Hamilton water jets: http://www.hamjet.co.nz/index.cfm/Th...t_history.html

[skyrunner06]

cool thanks everyone

[RMSOSF]

there are a lot of options as said before, but efficiency is the key. The inline jetpump style gives the best performance with the least amout of HP. The more the water has to travel through a pump, the less efficient it is.