[PSUBS-MAILIST] Removable tru hulls

Fri Jan 16 12:21:39 EST 2015

Ok. Perhaps I could weld carbon steel with a SS face just like the hatch? Maybe that is a little overboard.
Thanks
Scott Waters

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-------- Original message --------
From: Alec Smyth via Personal_Submersibles <personal_submersibles at psubs.org> 
Date:01/16/2015  11:07 AM  (GMT-06:00) 
To: Personal Submersibles General Discussion <personal_submersibles at psubs.org> 
Subject: Re: [PSUBS-MAILIST] Removable tru hulls 

Well here we get into ambiguous territory because I don't know how thick is thick enough to prevent distortion. One significant difference with a window seat is that the window seat is carbon steel rather than stainless, and I suspect SS will distort much more easily. If you can find an installation spot on the head, your design will be way more efficient in weight 
and $$$ because 1" thick material will suffice. I don't know, you might need to go to 3" or something. Or perhaps you could use 1" if you bolted it between two very solid steel discs before welding it in. Perhaps Dan L can chime in if he's reading this.

On Fri, Jan 16, 2015 at 11:52 AM, swaters at waters-ks.com via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
Good point Alec. I understand what you are saying. Pehaps I should redesign it to be thicker and be similar to a side veiwport. Thoughts?
Thanks,
Scott Waters

Sent from my U.S. Cellular® Smartphone

-------- Original message --------
From: Alec Smyth via Personal_Submersibles 
Date:01/16/2015 9:39 AM (GMT-06:00) 
To: Personal Submersibles General Discussion 
Subject: Re: [PSUBS-MAILIST] Removable tru hulls 

Just for everyone else, what we are talking about here is not a penetrator but a removable bulkhead into which you can screw penetrators. What Snoopy has on her stern endcap, which is on the project page. Scott, these should go on the head itself, but as Vance mentioned avoid the knuckle (the part where the head has maximum curvature). I wanted to add to that you should not put these in the cylindrical portion of the hull. The bulkhead seats are beefy, but even so if you weld them into the cylinder the weld tension will bend them out of plane and they will no longer offer a flat seat. Its hard to explain in an email, but the reason this happens is, when you weld them into the cylinder, the weld itself is not on a flat plane as it goes around the insert, it is curved. If you put them into the endcaps, the weld is in almost the same plane all the way around and the insert will not distort.

Locating smaller through-hulls (like one or two inch diameter) on the cylinder does not present this problem, but the big ones do.

Best,

Alec

On Fri, Jan 16, 2015 at 9:00 AM, swaters at waters-ks.com via Personal_Submersibles <personal_submersibles at psubs.org> wrote:
I am putting two removeable tru hulls in Trustworthy (same as Alec) for my manipulator arms. I want to put them close to the front veiw port of the sub. I know if I get to close to the front veiw port it hurts the structure. How close can I get to it and still not hurt the structure?
Thanks,
Scott Waters

Sent from my U.S. Cellular® Smartphone

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