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RE: [PSUBS-MAILIST] motor thought
Emile,
I don't know the efficiency of a water jet, but suspect it is somewhat lower
than a prop. And yes, it would definately depend upon nozzle velocity and
pressure. There are two ways to look at this. One is to use the pump
pressure through a simple nozzle jet similar to a twirling lawn sprinkler
(this is what cousteau's sub did). The other, imagine taking a water
turbine from a hydro-electric plant (down-scaling of course) and replacing
the stator/magnet with a propeller. You mount this contraption like a
regular minn-kota motor, but use hose or piping to duct the flow from the
pump to the turbine end of the unit. The high pressure water flow (relative
to ambient pressure) from the pump is directed to the turbine (squirrel cage
perhaps?) which drives the propeller.
Jon
-----Original Message-----
From: owner-personal_submersibles@psubs.org
[mailto:owner-personal_submersibles@psubs.org]On Behalf Of Emile D.L van
Essen
Sent: Saturday, April 08, 2006 10:21 AM
To: personal_submersibles@psubs.org
Subject: RE: [PSUBS-MAILIST] motor thought
Dan, John
A ceramic seal is good but a very little leakage can occur. In a typical
water pump, the room between motor an seal is always drained or open.
Allowable for in pods ??
What is the efficiency of a water jet? Depends on nozzle velocity? A normal
prop has a 50 to 75 % efficiency.
Emile van Essen
www.AiResearch.nl
-----Oorspronkelijk bericht-----
Van: owner-personal_submersibles@psubs.org
[mailto:owner-personal_submersibles@psubs.org] Namens Dan H.
Verzonden: zaterdag 8 april 2006 15:09
Aan: personal_submersibles@psubs.org
Onderwerp: Re: [PSUBS-MAILIST] motor thought
John,
If you using a pump to avoid a pressure compensated motor or a motor with a
heavy duty shaft seal, your heading in the wrong direction. Any water pump
you use is going to have shaft seal to keep the water in the pump housing
and out of the sub. You could just use the same type of seal on a thruster
pod to keep the water out of it. Use a carbon against ceramic spring loaded
face seal, like almost all water pumps use.
Dan H
----- Original Message -----
From: "Jon Wallace" <jonw@whoweb.com>
To: <personal_submersibles@psubs.org>
Sent: Saturday, April 08, 2006 12:35 AM
Subject: [PSUBS-MAILIST] motor thought
> psubbers,
>
> I had a thought today about motors for subs. Would it be feasible to
> create
> a motor on the theory of a reaction turbine, using ambient water
> surrounding
> the sub. My thought was this:
>
> 1) Mount a high pressure pump either inside or outside the sub.
>
> 2) The pump takes ambient water from it's environment and ducts it via
> hoses
> (or piping) to the turbine (squirrel cage, francis turbine, pelton wheel?)
>
> I suppose you could forego the turbine and just pump the water through a
> nozzle jet like Cousteau's saucer sub used. Anyway, the attraction I saw
> was no need for pressure compensation except for the pump which would be
> pretty easy to do.
>
> Any thoughts?
>
> Jon
>
>
>
>
>
>
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