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Re: [PSUBS-MAILIST] Nuytco sub observations
Hi, Jon:
On the Newtcomms - Vance's response reminded me that some time ago he
did ask about a stripped-down, plain jane version without the power boost
amps. pinger stuff, beacons, etc. and I told him "probably around $10K" and
that's about right, I think, or maybe a few bucks more.
The power boost amps will probably answer your range question: the way we
set this up is to draw the least power for the range you're working in . .
.draws about 75 watts in the lo-power mode and the clear range is about a
half a mile - If you switch to hi-power the range goes way up and the draw
is 125 watts - but you can go up to 200w or 300w or more - the range doesn't
increase in an exact linear fashion, but it gets way,way out there! (It is,
however, a power pig at very long ranges)
The 'Curasub' has the same external 'T' stiffeners as AQ - we use a GRP
'belly-pan' and have had zero problems with the stiffeners fouling - the
skids raise the hull bottom up close to two feet - so the skids would hit
first unless it's a projecting obstruction - and that's one of the the
reasons our crew is very skittish around wreckage or that sort of stuff and
why we like our 'auto-altitude' since it will guage for the highest point -
even if it's a stick! (well, I don't know that we've actually tried it with
a stick, but it's very good) .
Phil
----- Original Message -----
From: "Jon Wallace" <jonw@psubs.org>
To: <personal_submersibles@psubs.org>
Sent: Sunday, October 11, 2009 2:28 PM
Subject: Re: [PSUBS-MAILIST] Nuytco sub observations
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
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