[PSUBS-MAILIST] vacuum packed

Tue Sep 3 13:27:09 EDT 2013

Well, that's one I had to spend some thinking time on when PSUBS introduced the "convention diving prerequisite" that hatches open from either side. I eventually came to a solution that was jointly developed with Greg Cottrell. We put a bevel on the bottom outside edge of the dome, and sealed it with an O ring instead of potting it. The dome floats on a flat ring of polycarbonate lubricated with vacuum grease, and is secured only with wing nuts, so that in the event of needing to open the sub from the outside, that can be readily done without tools. It is not strictly speaking a hatch you can operate from either side, but it does accomplish the goal of emergency access. I investigated other options similar to the Deep Worker system, but could not come up with anything that would work - the difference is that the Deep Workers have a massive hatch ring, which gives you a lot more to work with in terms of locating through-hulls or other hardware.

Personally what I would explore is closing the hatch with shock cord, so that in the event of an emergency you could just lift the hatch a little and slice through the cords. But for that to work, you would really need nicely machined surfaces. Snoopy's is not re-machined after fabrication, and therefore requires the clamp pressure for the two surfaces to conform and make a proper initial seal.

Best,

Alec

From: Personal_Submersibles [mailto:personal_submersibles-bounces at psubs.org] On Behalf Of vbra676539 at aol.com
Sent: Tuesday, September 03, 2013 1:00 PM
To: personal_submersibles at psubs.org
Subject: Re: [PSUBS-MAILIST] vacuum packed

Finding a inside/outside hatch closure for Captain George's K-250 dome would be a real boon, in my view. It might not have to be quite Deepworker strong, as we aren't lifting the Ks by their hats, so to speak. But we could definitely do with something more user friendly.
Vance
-----Original Message-----
From: Alan <alanlindsayjames at yahoo.com<mailto:alanlindsayjames at yahoo.com>>
To: Personal Submersibles General Discussion <personal_submersibles at psubs.org<mailto:personal_submersibles at psubs.org>>
Sent: Tue, Sep 3, 2013 9:40 am
Subject: Re: [PSUBS-MAILIST] vacuum packed
A while back Emile offered plans for his submarine.
Perhaps there is the option of adopting them over the K boat plans?
Alan

Sent from my iPad

On 3/09/2013, at 6:10 PM, James Frankland <jamesf at guernseysubmarine.com<mailto:jamesf at guernseysubmarine.com>> wrote:
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<mailto: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 aaI have an archive of the Nekton construction drawings that I'm looking for a way to apreserve. 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<mailto:jamesf at guernseysubmarine.com>>
To: Personal Submersibles General Discussion <personal_submersibles at psubs.org<mailto: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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