Erik,
I noticed a fairing or duct aft of the cockpit. Is this designed to
smooth out laminar flow and reduce vortices? Have you done
any calculations to this effect? Or "will" there be a rear thruster ?
BTW, I don't know if that url helped or not, but I noticed [ in my
browser ]
the illustrations were poor. There is a pdf file for this, too. The
figures
are much clearer, but in BW.
PDF] ME 415 Group #5 Design of an Autonomous Underwater Vehicle Advisor
...
http://golem.math.stevens-tech.edu/auv/ME/DesignReport/meDesignReport.pdf
Did any of the computation formulas help?
--Steve
On Sun, 7 Mar 2004 01:51:56 EST DJACKSON99@aol.com writes:
EM
What is the displacement? So the tubes on the side are the batteries
and soft
ballast, right? Where is the weight? Also in the side tubes? If
the weight
is not in the keel, I'd think it might list too easy to when your
existing the
hatch in the top, envy if your not Santa :) Calculate your center
of
gravity for when your sitting on the hatch and make sure you not
going to tip over,
flood and sink. Have you considered a bottom hatch and a wet entry?
Do I count 4 thrusters? If the tail does not turn then do any of
the
thrusters? Or are you planing on steering only buy thruster speed
and direction? I
guess that can be done, but the control circuit will complex.
No doubt it will be a lot cheaper to build than a 1 ATM, but
certainly no
less fun. What materials are you thinking of using in addition to
the acrylic?
Puerto Rico sounds like a great place to be building a sub. Are the
walls
close to shore?
With greetings from Oklahoma
Doug J
In a message dated 3/3/2004 2:48:51 PM Central Standard Time,
emuller@naic.edu writes:
Thanks Doug for your comments, I can address a few of them right
away:
I was actually planning to have separated ballast, i.e. a fore and
aft
separation in the middle of the big ballast tanks.
The tanks on either side will be linked, so that rolling is not
generated by an offset boyant force, although pitch trim can be
fine-tuned depending on depleation of air tanks etc. Of course, I
might
end up adding forward planes anyhow.
Getting in and out will be through a hatch in the top (not for
santas).
There is enough ballast to give a freeboard of around 30-40 cm when
loaded up (I estimate). I envisage that the frame extending out that
back can also be used to attach boyant modules to fine tune ballast.
The V tail is simply a cop-out to try to get some stability mostly
against roll, since the projected resistive area against pitch and
yaw
is minimised for a 45 degree angle in the V and is maximised against
roll. Since that part of the machine will be (probably) in more
turbulent flow a small x-section is preferable. Furthermore, It will
be
entirely passive. Steering (yaw and pitch) is achieved by motors
only. I
wanted to get away from dive planes because I live in puerto rico...
there are big walls that I want to be near and be agile at low
speeds.
Since I am not using many heavy materials, that require much
machining,
I hope that it will be cheaper than the typical 1 atm sub. I think I
am
at more liberty to get things wrong and make a second attempt later
on.
I expect that it will be quite iterative.
Thanks again for your comments! Please let me know if I am proposing
anything which cause your eyebrows to jump in
confusion/hysteria/contempt/disbelief!
EM.
DJACKSON99@aol.com wrote:
Greetings EM
Slick looking design. Not the metal can I'm building :) You
might
consider reducing the displacement of the cabin in order to
decrease
the amount of ballast required when you convert to dry? Maybe you
can
use 2 canopies, one for hydrodynamics and the second for the air
seal. Since you're going to operate shallow you may want to
consider
that light entering the top of the canopy will reduce downward
visibility due to reflection. You'll need a forward ballast
compartment too, or you'll have to add dive planes and be more
like
the Bionic Dolphin (www.bionicdolphin.com
<http://www.bionicdolphin.com>) And you need some way of getting
in
and out without sinking once you strap on the ballast needed to be
dry, because your canopy opening will likely be below the water
line.
Maybe inflatable pontoons or a small top hatch? The v-tail is
cool
and low drag but they require a mixer that will complicate the
build some.
Thanks for showing your design. I look forward to seeing more.
Doug Jackson
www.jackson.parcabul.com/sub <http://www.jackson.parcabul.com/sub>
In a message dated 3/3/2004 8:10:40 AM Central Standard Time,
emuller@naic.edu writes:
Hello folks,
Due to pressure from un-named folks here (i.e. gauge
pressure),
and the
upcoming threat of competition by scubatron (i.e. absolute
pressure), I
have also posted some images of design plans for an ambient,
dry
machine
on moki.
I suspect I will take the construction in a two-step process,
firstly by
building a wet torpedo-like thing and checking how it all
works,
construction methods etc. Then I will cover it over and blow
all the
water out to turn it into a dry machine.
Comments please??
EM.
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