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Re: [PSUBS-MAILIST] Posted my design too!
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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