Re: [PSUBS-MAILIST] Nuytco sub observations

[Jon Wallace <jonw@psubs.org>]

Phil,

I was amazed at the clarity of the underwater comms and surely the units 
are worth the price, albeit a bit out of my personal range.  You and 
your staff have done a great job with those units and your products are 
absolute quality.  I'm curious what your range is with them.  Have you 
tested them to 2000 feet and is the clarity just as good at that distance?

Regarding the semispheres, my short term memory failed me again, however 
as soon as some of the responses explained about weight and consistency 
of thickness I recalled the video you showed and the explanation.  Based 
upon the calculations I've been getting out of the ABS hull-calculator 
spread sheet on the web site, it looks like for a given hull cylinder, 
elliptical tank heads are weaker than the hull.  By using a 
hemispherical head of same thickness (assuming uniformity of thickness 
between both heads) the hull is weaker than the head.  And generally, it 
looks like the hemispherical head is at least twice as strong as the 
elliptical head.  So there seems to be advantages to the hemispherical 
head except perhaps price which I'll have to find out about.

One other question for you Phil.  The Aquarius and your new sub (I might 
have missed you say it, does it have a name yet?) both use external 
ribbing.  I didn't take notice at the shop or on the dock, but do you 
have anything on the bottom to cover the ribs for avoidance of 
entanglement?  Do you think such a covering is necessary on the bottom 
of a vessel with exposed ribs?

Jon


Phil Nuytten wrote:
> 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




************************************************************************
************************************************************************
************************************************************************
The personal submersibles mailing list complies with the US Federal
CAN-SPAM Act of 2003.  Your email address appears in our database
because either you, or someone you know, requested you receive messages
from our organization.

If you want to be removed from this mailing list simply click on the
link below or send a blank email message to:
	removeme-personal_submersibles@psubs.org

Removal of your email address from this mailing list occurs by an
automated process and should be complete within five minutes of
our server receiving your request.

PSUBS.ORG
PO Box 53
Weare, NH  03281
603-529-1100
************************************************************************
************************************************************************
************************************************************************