[PSUBS-MAILIST] thoughts on adding a flange a K250 hull

Wed Jul 4 21:07:41 EDT 2018

 Ian, Your idea is brilliant!  I don't know why subs aren't built to split to start with.  When I work on Gamma with the dome and pod off it is amazing.  Mind you, climbing in and out through the hatch a  few dozen times a day keeps me pretty limber.  Hank
    On Wednesday, July 4, 2018, 6:04:00 PM MDT, irox via Personal_Submersibles <personal_submersibles at psubs.org> wrote:  

 #yiv0184680075 #yiv0184680075 -- DIV {margin:0px;}#yiv0184680075 
Hi Jon,
yeah, you are right, 3/16 isn't going to be enough, I was thinking 3/8 when I wrote the email.
I want to weld the edge/end of the cylindrical section of the ring to the the edge of hull cylinder (which is 1/4" thick).
Since the off the shelf rings won't do, I'll probably ask them to make 2 x 2 x 3/8 ring.
Cheers,  Ian.

-----Original Message-----
From: Jon Wallace via Personal_Submersibles 
Sent: Jul 4, 2018 4:05 PM
To: Personal Submersibles General Discussion 
Subject: Re: [PSUBS-MAILIST] thoughts on adding a flange a K250 hull

I'm wondering if 3/16 is thick enough for that application.  Will you be welding the ring on the inner surface of the hull or the outer surface?
Jon

      From: irox via Personal_Submersibles <personal_submersibles at psubs.org>
 To: personal_submersibles at psubs.org 
 Sent: Wednesday, July 4, 2018 3:56 PM
 Subject: [PSUBS-MAILIST] thoughts on adding a flange a K250 hull

Hi,

motivated to get a move on with my K250 resto-mod project after the adventures in Tahoe... :)

One thing I've long wanted to do was have a removable end cap on my K250.  The place
I'm planning on ordering my external T-rings has a bunch of off-the-shelf flanges (angle rings)
which could work.

http://anglerings.com/Store/CategoryID/4/Level/1/List/1

For example, a 2 x 2 x 3/16, Leg-Out orientation with 16 holes in 304SS is around $150,
so for $300 I could add a removable end cap.  This would length the hull ~4 inches, the added
weight would be reasonable close to the added displacement.

304 vs 316L.  I would love to do it in 316L, but since it's only going in the water when it's
being used, I don't think it's big factor.

External vs internal bolts.  I like going with the external bolts because this will make it easier
to remove.  As in I won't need to crawl around the back removing 16 nuts and bolts.

This is all to make the sub easier to work on, I'm not a small person.  Once I get this K250
into an operational state, I've got lots of projects I'd like to do with it, such as adding
INS, sonar, manipulator, etc. etc..  Possibly going the route Alec did and make it a two person.
Being able to easily remove the rear end cap will make it more likely that the other projects
will happen.

I'd appreciate any input on this.

Thanks!
  Ian.

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