RE: [PSUBS-MAILIST] Tanks

Joe,

Why not just use steel for your frames? I know it would add a little more weight up higher on your sub where you don't want it, but should be to bad. Also I know steel frames would add some more overall weight to the sub to get the same strength as the aluminum frames that you would have to take out of the drop weights to even every thing up from an aluminum arrangement. But some of the advantages are; no need for nylon sleeves, cheaper, and easy to weld onto main pressure hull, and they add allot of strength to the pressure hull.

Regards,

Brent Hartwig

From: "Joseph Perkel" <joeperkel@hotmail.com>
Reply-To: personal_submersibles@psubs.org
To: personal_submersibles@psubs.org
Subject: RE: [PSUBS-MAILIST] Tanks
Date: Tue, 24 Jul 2007 12:06:15 +0000

James,

I have several choices, composite over marine grad AL frames, or sheet metal over frames. Each with it's advantages and disadvantages. At this point in the model, you see structures designed for either of the above. The scantlings of these structures, are not yet determined but, will be appropriate to an 12k lb vessel.

You will note, that the end cones are "developable surfaces", (curved in one direction), as opposed to multidirectional in the earliest model of NR-2, lower down on the page. This is to allow choice of either materials.

Composite over frames.

Advantage, Corrosion control

Disadvantage, Labor intensive, density variations, dissimilar metal contact (AL frames / Steel, requires nylon sleeves)

Sheet metal over frames

Advantage, (Easy piecy Japanesey!), constant density.

Disadvantage, Corrosion control

When I have finished all of the conceptual design work, then the detail design work will begin. For accurate weight and balance calculations and, to take full advantage of the available software, I will use what I am likely to end up with, composite over AL frames. Build em and forget em!

These are modular in design and will come off easily for maintenance of the pressure hull proper and systems.

Joe

From:  "Lil Brother LLC" <lil_brother_llc@bellsouth.net>
Reply-To:  personal_submersibles@psubs.org
To:  <personal_submersibles@psubs.org>
Subject:  [PSUBS-MAILIST] Tanks
Date:  Mon, 23 Jul 2007 18:39:45 -0500
>Joe,
>
>Can I ask......what are your "soft tanks" constructed of?
>
>James Long
>Owner/Designer
>Lil Brother LLC (Instrument Division)
>
>
>
>
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