Re: [PSUBS-MAILIST] Great link page

Vance, what was it they'd done to those Minnkotas again? I remember they'd 
replaced the lip seals on the shaft, but was it with ceramic seals? Because if 
they go to 1,200 feet, I'm interested!
 
I'm been spending way too much time trying to source ceramic seals. There is a 
ubiquitous and cheap seal from John Crane called a Type 21, which in the MSC 
catalog is listed as "650 psi balanced / 250 psi unbalanced". Now, all my 
research so far indicates that whether a mechanical seal is balanced or not 
depends on the shape of the seal, and they offer only one shape, so I don't know 
what MSC is talking about. 
 
John Crane claims only the 250 psi figure, and their seals for 500 psi cost 
about 20 times as much.
 
 
thanks,

Alec

________________________________

From: owner-personal_submersibles@psubs.org on behalf of Joseph Perkel
Sent: Thu 3/8/2007 9:05 AM
To: personal_submersibles@psubs.org
Subject: Re: [PSUBS-MAILIST] Great link page



Vance,

The Minn Kotas are impressive!...I've seen enough now to stop worrying about 
thrusters. 

Nice photos of PC 1401. Of real interest to me are the saddle tanks (appears to 
be welded sheet metal), and the forward view port.

>From what I can see so far, for my boat, the fore and aft MBT's along with the 
fairings, can be standard mold / plug / glass construction. But the saddle tanks 
have a shape more conducive to sheet over frames.

So my question to you is, what gauge sheet do you suppose this is, and what 
should the interior surfaces be coated with? Once sealed, these would not be 
opened again.

Joe



    
________________________________

    From: vbra676539@aol.com
    Reply-To: personal_submersibles@psubs.org
    To: personal_submersibles@psubs.org
    Subject: Re: [PSUBS-MAILIST] Great link page
    Date: Wed, 07 Mar 2007 15:36:12 -0500
    
    
    Re: 1401. Do you guys remember the discussion we had about Minn-Kota 
thrusters modified to sustain up to 1200 feet without compensation? Well, there 
they are. Vance
     
     
    -----Original Message-----
    From: MerlinSub@t-online.de
    To: personal_submersibles@psubs.org
    Sent: Wed, 7 Mar 2007 3:28 PM
    Subject: [PSUBS-MAILIST] Great link page
    
    
    http://www.modell-u-boote.de/links/links_originale/links_originale.html
    
    http://www.modell-u-boote.de/originale/perry_1401/perry.html
    
    http://www.modell-u-boote.de/originale/marder/marder.html
    
    http://www.modell-u-boote.de/originale/holland/holland.html
    
    regards Carsten
    
    
    
    
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Re: [PSUBS-MAILIST] Great link page - mechanical seals
