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Re: [PSUBS-MAILIST] Water nozzle propulsion



I would say just generally,  that every time you have to go from one type of power transmission to another you will have a certain amount of power loss due to the coefficient of friction for that particular device.  The most direct and efficient transmission of power would be a electric motor going directly to a prop turning in the water.  If you are going to, first a electric motor to a hydraulic pump and then second, from a hydraulic pump to a hydraulic driven water pump you will be adding many steps which will absorb energy every step of the way which will manifest it self in terms of heat to each device. 
 
Brian 
 
 
 
 
----- Original Message -----
Sent: Sunday, April 09, 2006 11:20
Subject: [PSUBS-MAILIST] Water nozzle propulsion

I am working on the design and construction of a hydraulically driven, variable speed, water nozzle thruster system at this time. So far I have been able to get together most of the necessary pieces: 24V DC motor, hydraulic gear pump and hydraulically driven water pump. I still have to acquire the necessary supply and return hoses but I am hoping to have some basic static testing done by the end of this summer. My intention is to power my submersible in a similar manner to the Cousteau subs. I do not see this as an inefficient system based on my calculations as many on this list do. I will be glad to share my findings once I have some real data in hand.

 

Regards,

 

John Gaertner

Keswick, VA

 




-----Original Message-----
From: vbra676539@aol.com
Sent: Apr 9, 2006 12:59 PM
To: personal_submersibles@psubs.org
Subject: Re: [PSUBS-MAILIST] motor thought

I agree in principal, but spent a few uncomfortable hours in pretty deep water struggling with entanglements. The Cousteau jet pump was primitive, but effective. By accepting the obvious limitations in power, they were able to work three different submersibles through many hundreds of dives without entanglement. There is something to be said about that kind of safety record, and I think it is worthy of consideration as an alternative method of propulsion for psubs. Mind you, I haven't done it, either. My K-350 is going back together this summer pretty much as designed (except for lessons learned by Dan and a few others, which I will incorporate in one way or another). However, I ain't giving up on some kind of pump for future reference.
Vance 
 
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