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Re: [PSUBS-MAILIST] Hello Everyone



The scrubber can be tested in somthing as simple as a plastic bag of suiteble size...

Regards

Peter
----- Original Message ----- From: "Bryce Yarbrough" <byarbrough@mac.com>
To: <personal_submersibles@psubs.org>
Sent: Thursday, October 04, 2007 7:50 PM
Subject: Re: [PSUBS-MAILIST] Hello Everyone


Hmm.. what a predicament.. Well if I had a sub, I would volunteer for sure. Any other way to test it besides in a sub? perhaps a sealed room or chamber that can simulate the small confined space of a sub?

Bryce

On Oct 4, 2007, at 8:40 AM, Ray Keefer wrote:

Hi Bryce,

At the convention Jonathan announced the details of a
scrubber project that PSUBS LLC is sponsoring. We need
a willing voluteer and an instrumented hull to test
the current design. Esentially the design just hooks a
fan onto an existing off the shelf CO2 absorber
cartridge.

To date no volenteers, hence no progress, no finail
design to share with the community.

Regards,
Ray


--- Bryce Yarbrough <byarbrough@mac.com> wrote:

I did check the archives as much as I could for CO2
Scrubbers, And I
did not find a definitive design or system listed
anywhere. Perhaps
it came up in September, for which the archives are
not up yet. Who
knows. :-)


Bryce

On Oct 4, 2007, at 12:09 AM, Sean T. Stevenson
wrote:

Bryce, welcome to the list.  You obviously have a
lot of
questions.  Many of
these can probably be answered with some further
research.  Aside from
scouring the internet for answers, a few good
places to start would
be:

Rules for Building and Classing underwater
vehicles, systems and
hyperbaric
facilities, ABS

Safety standard for pressure vessels for human
occupancy, ASME

Concepts in submarine design, Burcher and Rydill

Manned submersibles, Frank Busby

and of course, everything on the PSUBS website.

To address a couple of your specific questions off
the top of my
head - active
sonar is an indispensable tool for underwater
navigation, and there
are many
units available for a wide variety of
applications.  Radar is only
really
practical on a large sub with significant height
of antenna - where
this
makes sense, you can simply pressure compensate
it.  As for through
hull
linkages, you can achieve linear motion, but it is
usually better
to stick to
well constrained rotary motion and convert that as
necessary
outside the
hull.  Depth determination by sonar, typically
referred to as an
altimeter,
is not robust.  Depth determination is usually
performed with a
pressure
transducer.  While there are few if any rules that
pertain
specifically to
recreational submersibles, they are watercraft and
as such are
subject to the
International Regulations for the Prevention of
Collisions at Sea.
The FBI
is aware of PSubs.  Your responsibility as a
designer is merely to
be as
prudent as possible - while you may not certify
your sub to ABS or
equivalent
standards (an arduous and expensive process), it
couldn't hurt to
design to
those specs wherever possible.  The safer we are,
the better chance
we have
at staying deregulated.  Radio does not propagate
well through
water, except
at extremely low frequencies.  GPS will not work
when submerged.
Underwater
navigation is achieved in most PSubs simply by a
combination of
sonar and
dead reckoning.  In more advanced systems, an
inertial measurement
unit can
provide position estimated based on accerations
integrated over
time - such
position estimates are subject to integration
error (inversely
proportional
to the cost of the IMU), and must be corrected
occasionally.  There
are many
different CO2 scrubbing systems - check the list
archives.

Good luck!

-Sean


On October 3, 2007 20:34:42 Bryce Yarbrough wrote:
Hi Everyone!

My name is Bryce, Jon thought it would be a good
idea for me to
introduce myself to all 500 and something of you.
I am 19 and based
in Los Angeles, and am in the design phase of my
submarine. (Jon also
thought it would be a good idea to make sure I
can at least post to
the mailing list because for some reason, my
email system is
different then everyone else's on here and he
wants to see if it
works or not. So hopefully it goes through).
Other then that, here is
the first post I planned on putting up to the
mailing list several
days ago, but because I just have to be
different, I got rejected
several times because of my email layout, so here
goes...


Hello Everyone!

I am knew to this mailing list and site, but not
that new to the
world of submarines and robotics. I have been
actively involved in
robotics throughout high school and have been
working with them for
over 6 years now. I also built a small R/C
Submarine, and have
decided that a goal of mine is to build a
submarine. With the help of
my high school (we are doing it through the
robotics club as a
project, great way to get materials, electronics,
and money donated
to the submarine) we are going to build a sub. We
are looking at
about 30 Feet long with a 5 or 6 foot beam. I
have run into several
questions, that even despite my research, I
cannot answer at this
time, so I am turning to you guys :-). (btw I am
19, just to let you
know). My questions are (at the moment that I can
think of):

-How do you seal up a hole in the pressure hull
that contains any
such motors to control the dive planes or
rudders, if the linkages
move forwards and backwards through the hole,
instead of just turning
(any other ideas on the subject would be great)

-We have decided that we want to use a Life
Support System involving
scrubbing the CO2 out of the air, and releasing
O2 into the air when
needed.
-- Anyone figured out a great system to do this
with yet?
--Anyone have sensors and such equipment yet?

-To recharge the ballast tanks, we want to use an
onboard electric
air compressor (I just don't like the thought of
fuel onboard the
ship), anyone have any suggestions on which ones
to use, things to
look out for?

-Navigation/Electronic Equipment:
-- Sonar:
---Any systems that anyone USES for their subs,
how well they work,
etc?
---Hydrophones yet?
--- Active Sonar Systems?
--Radar:
---Does anyone use radar for when they are on
the surface?

=== message truncated ===




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