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Re: [PSUBS-MAILIST] My PSUB Explorer



Sorry for the very late response.

The set up you are describing is commonly called "Kort Nozzles". They are used 
on tugs and various ships. They are effective mostly within a certain speed 
range: I believe 6-8 knots for ships. They increase the efficiency of the 
prop, reducing fuel consumption I believe. They aren't effective at high 
speeds, or very low speeds. The cross sectional shape of the shroud is that 
of an aerofoil.

JP


On Tuesday 24 September 2002 12:21 pm, Coalbunny wrote:
> I only know it by that.  It is/was an experimental drive for a submarine
> intended for speed, I believe.  Take a submarine and put torpedo tubes
> running horizontal along the bottom.  Except they aren't torp's, they go
> to the prop, which is inside the tubes.  Wider at the front and narrower
> at the back, I believe.  Anyhow, it uses the same principle used by my
> industry- mining.  Look for information on suction dredging.  Jeene
> Engineering makes those kinds of dredges.  You have a little bit of high
> pressure water coming in at an angle, and it creates a suction brining
> in a lot more water through the bigger tube.  I'll have to sketch out
> the thing I saw and get it scanned.  Was many years back.  Don't even
> remember who I saw had it or where.  But that was the name, I believe.
> Reportedly could increase speed with no noticeable increase in power
> consumption.
> Carl
>
> Michael B Holt wrote:
> > On Mon, 23 Sep 2002 21:56:43 -0600 Coalbunny <coalbunny@vcn.com> writes:
> > >Why bother with props?  What's wrong with using "cavitated water
> > >jets"?
> >
> > Or, along the same line (sort of), why not try shrouding the props with
> > thin plexiglass?
> >
> > What's a cavitated water jet?   Do I know it by another name?
> >
> > Mike H.
> >
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