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Re: [PSUBS-MAILIST] My PSUB Explorer
- To: personal_submersibles@psubs.org
- Subject: Re: [PSUBS-MAILIST] My PSUB Explorer
- From: JP <jeffpost@rawbw.com>
- Date: Mon, 7 Oct 2002 19:18:01 -0700
- In-Reply-To: <3D90BB3D.FBE7B585@vcn.com>
- References: <4371B9E007C62D40A46FA016C2043E5720A725@cp_mail.cp.com> <20020924.104817.11350.0.tlohm@juno.com> <3D90BB3D.FBE7B585@vcn.com>
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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