Re: [PSUBS-MAILIST] motor pod seal

In a message dated 1/26/2009 3:14:03 P.M. Central Standard Time, Alec.Smyth@compuware.com writes:

Hi Dean,

The compressor tank is probably built for 200 psi internal, but if you're planning to pressure compensate it, then an ordinary lip seal should do. It's just the pressure differential that will act across the seal. Pressure compensated trolling motors do fine with their standard lip seals.

As far as bearings are concerned, your question is very timely for me. I'm building by assemblies, and have been collecting parts for the next one which happens to be my prop shaft, seals, tunnel, and kort nozzle. I've gone for two conical bearings mounted in opposition. That way I have a thrust bearing for forward and another for reverse. But I'm curious what others have used for this, and still have time to make changes since I haven't built it yet. I expect to start on this assembly in about a week. Any opinions?

thanks,

Alec

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From: owner-personal_submersibles@psubs.org [mailto:owner-personal_submersibles@psubs.org] On Behalf Of Recon1st@aol.com
Sent: Monday, January 26, 2009 15:57
To: Personal_Submersibles@psubs.org
Subject: [PSUBS-MAILIST] motor pod seal

I am trying to figure out what to use for a shaft seal for my main motor

I am planning on manually pressurizing a pod made from and air compressor

tank. So I guess what I am looking for is a shaft seal that will take up to 200 psi

internal pressure, this is way out of my expertise.

Any suggestions on what to look for

That and do any of you use bearings for the propeller shaft? All I seem to see

are just bushing types, I am using a 12hp dc motor and it seems to me that a

thrust bearing is in order.

Dean

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