From: "Pierre Poulin" <pipo305@hotmail.com>
Reply-To: personal_submersibles@psubs.org
To: personal_submersibles@psubs.org
Subject: RE: [PSUBS-MAILIST] Stainless & O rings
Date: Tue, 06 Apr 2004 13:11:19 -0400
Hi Brain,
Was your suggestion to only use the stainless steel shaft or use both the
shaft and the seal as a thruth-hole?
Pierre
From: "Brian Cox" <ojaibees@ojai.net>
Reply-To: personal_submersibles@psubs.org
To: <Personal_Submersibles@psubs.org>
Subject: [PSUBS-MAILIST] Stainless & O rings
Date: Thu, 25 Mar 2004 12:48:44 -0800
Hi All, Found a great source of stainless steel for thru hull
fittings; stainless steel prop shafts, they can many times be found at
boat yards and are sometimes in a junk pile because they've been bent or
damaged. I've just got done cutting one up into little pieces. I also
recieved my Parker "O" ring cataloge and it is very informitive, they
say the best "o" ring material for water is ethylene propylene rubber
but the lubrication recommended is silicone oil, glycerin or ethylene
glycol since petroleum lubricants will degrade the ethylene propylene.
Parker also has a CD that is free that can help you design your "o" ring
application.
Note: Parker is the company that supplied the "o" rings for the space
suttle that blowed up. But maybe nasa didn't check the specs?
Brian
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