Vance, Wouldn't the most elegant solution be to leave the cylindrical hull intact, but put your speed controllers on the outside? That way the heavy gauge cables don't need penetrators, and all you bring into the hull are the skinny control cables. I'm assuming the motivator here is to minimize penetrators? cheers, Alec _____ From: owner-personal_submersibles@psubs.org on behalf of Dan H. Sent: Mon 4/10/2006 8:42 AM To: personal_submersibles@psubs.org Subject: Re: [PSUBS-MAILIST] structural question Vance, I'm not the guy to do the calculations but I'd bet you would need to reinforce the slot your taking out of the hull tube similar to the way you have to reinforce around a viewport. The forces in the hull tube would be trying to close your slot and would have to be carried across the opening with something substantial. More then just the ribs in that area. Also, with the batteries in a box like that you would loose the protection in case of a battery explosion. The way it is now, the pod end cap will blow off but you won't flood or get hit. But, Maybe battery explosions aren't such a big problem as I was led to believe. Dan H, ----- Original Message ----- From: vbra676539@aol.com <mailto:vbra676539@aol.com> To: personal_submersibles@psubs.org <mailto:personal_submersibles@psubs.org> Sent: Sunday, April 09, 2006 1:22 PM Subject: [PSUBS-MAILIST] structural question I'm planning on another K-sub, but thinking about a box keel like the Nektons and Delta had, rather than pods. Has anyone got an idea about how to figure structure on something like that? The Nekton's box was 9/16" wall, flat side and bottom, and reinforced with flat plates running athwartships on 18" centers (more or less). The hulls were the same thickness and the same material (A516 Grade 70). I'm wondering if there would be any penalty to building a 1/2" thick box with 1/4" dividers matched to the ring stiffeners in the hull (ie., 12" centers). The box would be a foot square in cross section, and if all seems well, would be welded through a slot in the hull and covered inside with a reinforced aluminum deck plate gasketed and vented for charging. If the pressure hull is six feet long in the cylinder, that would give me room for a grunch of 85 amp deep cycle batteries (more than called for) and still not kill my payload. Anyone not familiar with K-subs might think all this sounds pretty heavy. Have a look at the lead load in Dan's boat, if you think we don't have it to spare. Vance The contents of this e-mail are intended for the named addressee only. It contains information that may be confidential. Unless you are the named addressee or an authorized designee, you may not copy or use it, or disclose it to anyone else. If you received it in error please notify us immediately and then destroy it.
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