Sorry, I just don't understand. If your cans are either compensated or liquid filled it is exactly the same as if they were operating on the surface, with just one exception; Components inside the can that have cavities themselves, such as a battery. But so long as we're talking things like copper cables, magnets, and bearings, which are incompressible, there are no forces whatsoever on them in a pressurized environment. I guess my point can be summarized like this. Pressure doesn't induce stress, only differential pressure induces stress.
thanks,
Alec
________________________________
From: owner-personal_submersibles@psubs.org on behalf of George Slaterpryce
Sent: Thu 1/4/2007 2:05 PM
To: personal_submersibles@psubs.org
Subject: Re: [PSUBS-MAILIST] Thrust from a pump?
I always assumed that oil/pressure compensating just transfered the
compression stress from the can to the components, 'swhy I've stuck
everything in preasure cans or designed, designing, built, building
magcoupled thrusters, sure you have to deal with slippage and a little bit
more expensive (a lot more if you don't either have friends with a well
stock machine shop or a machine shop yourself) but it's the best solution
for me. Might I suggest you look into stuff like this?
George H. Slaterpryce III
www.bridgessoftware.com
www.captovis.com
----- Original Message -----
From: "Smyth, Alec" <Alec.Smyth@compuware.com>
To: <personal_submersibles@psubs.org>
Sent: Thursday, January 04, 2007 1:11 PM
Subject: RE: [PSUBS-MAILIST] Thrust from a pump?
Trolling motors are built to reverse, but why would the depth be a factor?
If you are either pressure compensating or oil filled, depth has no impact.
________________________________
From: owner-personal_submersibles@psubs.org on behalf of Recon1st@aol.com
Sent: Thu 1/4/2007 12:25 PM
To: personal_submersibles@psubs.org
Subject: Re: [PSUBS-MAILIST] Thrust from a pump?
In a message dated 1/4/2007 10:52:04 AM Central Standard Time,
Alec.Smyth@compuware.com writes:
Yes, and in addition depending on the type of pump a thrust bearing
could be on the wrong end of the shaft in "reverse".
Lots of food for thought here...
Alec
Once again hadn't thought of this. Does anywone know
if larger trolling motors have the ability to reverse at say
400 ft fw.
I would guess if the motor came with the ability to reverse
it would also have to have a rear thrust bearing.
The more I design my sub the more I find out how little
I have really thought thru the basics.
Dean Ackman
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