[PSUBS-MAILIST] awsome seal

Wed Sep 4 08:34:13 EDT 2013

Hi Alec,
Thank's for the info.
I know that the shaft needs to be plunge ground with the correct  Rockwell hardness.  I did not know the about the speed versus pressure.  I have sent them a request for the graph.  I had a hard time getting the specs from them.  I had to ask several times.
Hank

From: Alec <alecsmyth at gmail.com>
To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
Sent: Tuesday, September 3, 2013 7:36:34 PM
Subject: Re: [PSUBS-MAILIST] awsome seal

Hi Hank,

I once bought (and still have) some custom made Parker lip seals that sound very much like those, but careful with two things:

The top pressure was for low rpm, and the top rpm for low pressure. You could not run them at BOTH top speed and top pressure. The specs included a graph of speed vs. pressure and one had to stay below the line.

In addition they were very particular about the shaft finish. Too rough and it would eat the seal, too smooth and it would not lubricate it sufficiently (they were lubricated by a film of water). You could get little slip-on bands for the shaft, with just the required finish.

All I'm saying is be sure to check the detailed product literature.

Best,

Alec

On Sep 3, 2013, at 8:52 PM, hank pronk <hanker_20032000 at yahoo.ca> wrote:

I have been searching for a replacement seal for my propeller shaft in Gamma.  I found a seal for 130 dollars, it is 5/8 by 1 1/8 .  The seal is rated for 5,000 psi  and can handle 1,700 rpm .   This seal is a spring loaded lip seal for water hydraulics.  The seal has an O-ring on the outside to seal it to the housing.  How cool is that ?
>Hank 
>
>
>From: Graham Bayliss <whitestar456 at manx.net>
>To: 'greg cottrell' <jgcottrell2002 at yahoo.com>; 'Personal Submersibles General Discussion' <personal_submersibles at psubs.org> 
>Sent: Tuesday, September 3, 2013 12:46:13 PM
>Subject: Re: [PSUBS-MAILIST] vacuum packed
>
>
>
>Hi 
> 
>I am building Casper 2 and have redesigned the hatch i realise this is not original to the kiterage design but i am willing to make the change rather than be trapped inside my sub this allows someone to open from the outside. I have put pictures on the club web site if any one wants to look.
> 
>From:Personal_Submersibles [mailto:personal_submersibles-bounces at psubs.org] On Behalf Of greg cottrell
>Sent: 03 September 2013 19:06
>To: Personal Submersibles General Discussion
>Subject: Re: [PSUBS-MAILIST] vacuum packed
>
>I few years ago I was talking with George and suggested a few upgrades that I could manufacture for k-subs and offer with his approval. His response was that no changes could be offered because the original design (actually the vast design) was ABS certified and this offered some liability protection that might be void if any changes were made.
> 
>I don't know if it really mattered but that's how he felt. With that in mind, it might be possible to offer "generic" parts that could work on the k-boats without using the Kittredge name.
> 
>Greg
> 
> 
> 
>From:James Frankland <jamesf at guernseysubmarine.com>
>To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
>Sent: Tuesday, September 3, 2013 12:10 PM
>Subject: Re: [PSUBS-MAILIST] vacuum packed
> 
>Well, its just an idea\thought.  Im not sure on the legalities of it, but if there was a Kboat replacement, id be happy to make a prototype and test it.  Otherwise i will probably make a new hatch anyway over the winter, seeing as i have the dish.
>regards
>James  
>On 3 September 2013 15:36, <vbra676539 at aol.com> wrote:
>We'll need to get Jon in on this for liability considerations. That said, I think there might be a set of Perry drawings out there (although the hatches are heavier than we need) and I have an archive of the Nekton construction drawings that I'm looking for a way to preserve. If the legal end doesn't bite us, then I'm sure we can figure how to adapt proven technology to our requirements, and then provide the result with the K-plans sold on the site.
>Vance
>-----Original Message-----
>From: James Frankland <jamesf at guernseysubmarine.com>
>To: Personal Submersibles General Discussion <personal_submersibles at psubs.org>
>Sent: Tue, Sep 3, 2013 1:45 am
>Subject: Re: [PSUBS-MAILIST] vacuum packed
>Agree strongly with Vance here, the standard K hatch is rubbish.  If anyone wants to chip in any ideas for a "club design" i'm happy to make it over the winter.  I have a spare dish which was left over from the endcap hole II cut out.  Its just the right size, dished and 13mm thick.
> 
>Otherwise im probably going to make one anyway (once ive put in a new kitchen at home.. :)
>Kind Regards
>James 
> 
>>I do think it would serve us well for someone to design a K-hatch >modified with thru-hatch closure. It is truly nutty to bolt ourselves into a sub >without some way for someone on the outside to help us, should we need >it. Maybe something for the next conference?
>> 
>>>Vance
>>
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