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Re: [PSUBS-MAILIST] Nuytco sub observations



Hi, Jon:
Re: U/W comms - the 'NewtCom' system is our house brand - it's a digital system that combines some reliable, proven 3rd party boards (power amps, etc.,) with some Newtoid-developed proprietary stuff. We sell these systems to other sub-owners and builders, (many of which would be familiar to you) but for home-built subs they are quite pricey - about 15K for top and bottom units, Xducers, etc. There is provision built in, though, for some neat stuff which we plan to add into these units in the future - pinger receiver, emergency beacon, and so on. Re: Segmented heads for cylinder-subs . . . one piece hemispherical heads (typically) cannot consistently hold thickness past a 45 degree draw. We have made spherical hulls using pressed full hemis and calculated the depth rating based on the thinnest apex portion - but it means you are carrying a lot of unnecessary additional weight and, again, the thicknesses as-calculated (or "as promised") and as-delivered are often quite different. We pretty much now use 'fat squares' exclusively, to build spherical hulls - they produce very accurate sphericity dimensions.As you may have seen in the video I showed at the Maritime Museum, we press these as 'semisphere' and then use a jig to cut the to 'squares' - the 'fatness' is a function of the cutting die.
Phil
----- Original Message ----- From: "Jon Wallace" <jonw@psubs.org>
To: <personal_submersibles@psubs.org>
Sent: Saturday, October 10, 2009 10:59 PM
Subject: [PSUBS-MAILIST] Nuytco sub observations



It's funny how some things stick in your mind even though we experienced so much in Vancouver. A couple of things that I've been thinking about:

1) Did anyone else notice the clarity of the underwater communications? I'm not sure what I expected, but I found it crystal clear and think that we should really be promoting it as standard equipment on our subs.

2) I noticed that the back head on Phils newest sub ( click this link http://www.psubs.org/convention/2009/photos/jonw/800/DSCN0773.JPG ) is segmented rather than pressed from a single blank of steel. I remember Phil talking about this but don't recall the benefit of using segments. I've been looking at Prescor in Tulsa Oklahoma who heat steel blanks and then press them into the correct shape with a die. Is there any reason this is not as viable as a segmented head?

Jon




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