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Vance, I was home for a short stint and excavated down to my sub to double check some measurements on the plate thru hull. The tube has a ID of about 6 inches, and a wall thickness of 1/4". The top plate is 5/16" thick and the flange is 3/8" thick and 4" long. The tube protrudes 2" above and below the main hull tube. The OD of the plate is 8 11/16". The edge of the flange and plate are 3/4" from the rear most point of the conning tower. You can see the gland dimensions in the pictures. I didn't use my digital calipers because I figured you would only want some rough measurements, and I couldn't find them to boot. I'll make up a CAD assembly model when I get a chance. Snow shoeing is a great workout. http://cid-5085d10eb6afe47c.skydrive.live.com/browse.aspx/Electrical%20Thru%20Hull%20Wiring/Large%20Plate%20Thru%20Hull%20on%20K-250%20%7C3118/Additional%20Measurements Regards, Szybowski From: brenthartwig@hotmail.com To: personal_submersibles@psubs.org Subject: RE: [PSUBS-MAILIST] Large Plate Multi Thru Hull Options Date: Fri, 30 Jan 2009 17:00:23 -0800 Vance, Having easy thru hull options is useful. I will be adding another plate thru hull assembly in front of the conning tower as well under a small standing platform. I also want that same type of platform behind the conning tower. That existing plate thru hull, looks like they just used a standard pipe flange and welded it in. My friend had SS ones like that he installs in his SS tanks I could use if I wished. I don't have all the data here with me, but if I recall correctly the tube has a ID of 6 inches, and a wall thickness of 1/4". The top plate is 5/16" thick and the flange is 3/8" thick. The OD of the plate is 8 3/4". I was planning or replacing the steel plate with a thicker 316 SS one. I've now been thinking about cutting off the flange and installing a smaller diameter plate, and attach it internally sorta like the ones on the S201, but use welded on SS tabs instead of the SS retaining ring, to make it even easier and cheaper to fab up. This configuration might be the cheapest and easiest to make and install in the tube section or the heads. Basically you just start with a cheap steel tube. I'm planning on making a CAD model shortly, so I can show you exactly what I'm thinking. Regards, Szybowski To: personal_submersibles@psubs.org Subject: Re: [PSUBS-MAILIST] Large Plate Multi Thru Hull Options Date: Fri, 30 Jan 2009 17:53:03 -0500 From: vbra676539@aol.com Brent, It looks like a pretty good way to get multiple connectors without having to chuck the sub up in a mill. How thick is that flange, and how thick the tubular penetration? Assuming they were an assembly, it seems like you might be able to install something like that without distorting the O-ring mating surface. Maybe I'd be tempted to repace the disc with a stainless piece, but hey, it's there, right? Run what you brung. Vance |