[PSUBS-MAILIST] Fw: sealing metheod

Thu Jul 28 11:13:39 EDT 2016

Thanks for the offer. I've peered through a many of them both. Big window are great, but they mean NOT a Nekton. Which is not a bad thing, either, just different. Better in my...um, view. But you'd never convince those California guys. They wanted slim and no entanglements for safe ops in lonely places. And they swore by the flat ports. Couldn't convince them otherwise, and I tried more than once. 12,000 dives later for the series left little need for further validation as far as they were concerned. Hard to argue with that kind of success, regardless of opinions to the contrary--mine included.

-----Original Message-----
From: hank pronk via Personal_Submersibles <personal_submersibles at psubs.org>
To: Personal Submersibles General Discussion <personal_submersibles at psubs.org>
Sent: Thu, Jul 28, 2016 10:23 am
Subject: Re: [PSUBS-MAILIST] Fw: sealing metheod

Vance,
Come for a ride in Gamma and sit up front looking out the dome compared to the tiny original ports, you might re-think how you would build your Nekton after that ;-)
Hank

 On Thursday, July 28, 2016 8:06 AM, via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

James,
The break in your viewpoint edge is structurally relevant, as without it you get a very fragile corner. Plus the o-ring at that location is the modern standard for low pressure seals. Your gasket on top arrangement is not actually necessary, nor is it common. At depth, the acrylic to metal interface provides the seal. And yes, that would be the first of the Nekton series on page 275. When the order for the next pair of subs came along, the designer added Alpha to the first sub's name to differentiate from the newer boats (Beta & Gamma, and eventually, Delta). ABS was disinclined to allow the turret, as it was called, and it had turned out in any case to be less operationally useful than was originally hoped as the observer's weight shifted that far forward caused trim problems. It worked fine, however. In fact, it is still working fine to this day, as the sub is kept in pristine and dive ready condition by its current owner--in its original design configuration, I might add, with minor upgrades. You don't mess with success. Were I building one today, it would have standard configuration (Perry style/your style) viewports, but I'm not sure that I would change much of anything else. They were and are truly the most successful Deep Jeep, simple, inexpensive, light weight, and pretty much bullet proof. That's a hard combination to beat.
Vance

-----Original Message-----
From: James Frankland via Personal_Submersibles <personal_submersibles at psubs.org>
To: Personal Submersibles General Discussion <personal_submersibles at psubs.org>
Sent: Thu, Jul 28, 2016 8:41 am
Subject: Re: [PSUBS-MAILIST] Fw: sealing metheod

Thinking about it, I don't think I have the cork bit actually on that port. Its the normal ports I had to put the cork bit on.  So the epdm gasket goes right across.  I have Stachiws book here at work for quick reference, so checking page 353...yes, its almost the same.  Except I put the O ring into the little gap.  The gap was unintentional and it just arrived like that when I got it from Stanleys.  But it fitted an O ring perfectly.  Oh well, it seems ok.

I just noticed, page 275, is that Gamma?  Suspect its one of the others.  And some odd looking square ports on that forward view tower, if that's what it is.

On 28 July 2016 at 12:55, hank pronk via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

James, 

Thank you for the picture and idea, I have attached a picture from page 353 of the Stachiw book that shows similar to what you are showing.  Your picture shows exactly what I had except for the o-ring and my EPDM gasket went right across without the cork riser.  Your design is much the same as design 'A"in the book.    
Hank

 On Thursday, July 28, 2016 5:49 AM, xxx xxxxx <mp13 at live.ca> wrote:

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