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Re: [PSUBS-MAILIST] NR-2 Thruster Arrangement
Joe,
I like your plans they seem to be very complete so far.
The thruster is a good point to make a decision about the system that will
be used. If you are thinking about using a premade thruster (Minn-Kota,
etc.), the options are fewer.
It can be pretty expensive to test all the options. If you are considering
building your own thrusters I would suggest trying a brushless motor. They
save power while producing more hp. The sub controls (electronics) will be
more expensive, but your power budget will go farther.
If you want to explore brushless motors, just search for "3 phase brushless
dc motor".
The only other question I can come up with, what is the typical hp rating
for the Minn-Kotas being used?
James Long
Owner/Designer
Lil Brother LLC (Instrument Division)
----- Original Message -----
From: "Joseph Perkel" <joeperkel@hotmail.com>
To: <personal_submersibles@psubs.org>
Sent: Thursday, July 26, 2007 4:04 PM
Subject: Re: [PSUBS-MAILIST] NR-2 Thruster Arrangement
".........I would like to see your thruster design (actual motor pod), if
that would be
possible.........."
James,
I don't know yet, this is the "detail" stuff. What I am doing is
determining the concept and, then what it takes to do it.
You already have what I will start with, the K boat plans. Beyond that, I
will likely dissect a trolling motor, a well pump, and mine the ROV
groups,.... all for ideas. This along with various courses and texts. What
you see in the model is basic shapes, a cylinder, kort nozzle and, a prop
based on the size of the large Minn-Kotas.
Joe
>From: "Lil Brother LLC" <lil_brother_llc@bellsouth.net>
>Reply-To: personal_submersibles@psubs.org
>To: <personal_submersibles@psubs.org>
>Subject: Re: [PSUBS-MAILIST] NR-2 Thruster Arrangement
>Date: Thu, 26 Jul 2007 15:03:03 -0500
>
>Joe,
>
>The rigging can be done with different thrusters, but I'm not sure what
>situations may arise. I think it would be safe to assume (that word again)
>that the thrusters (once balanced) should work correctly in most
>situations.
>The controls (if done right) should be very intuitive after an hour of
>operating.
>
>This is all based on theory in my case. The balancing of the thrusters
>could
>reduce some of their functionality. For example.....in a vertical descent,
>the two forward "x" thrusters would have to be turned down, for the one
>rear
>vertical thruster to keep up. It may turn out to be the opposite is true,
>I'm not sure at this point. This could all be done with a microcontroller
>setup, and would be independent from pilot thought.
>
>The problem....the vertical descent would be slower. You see the evolution
>happening here.
>
>I would like to see your thruster design(actual motor pod), if that would
>be
>possible.
>
>James Long
>Owner/Designer
>Lil Brother LLC (Instrument Division)
>----- Original Message -----
>From: "Joseph Perkel" <joeperkel@hotmail.com>
>To: <personal_submersibles@psubs.org>
>Sent: Thursday, July 26, 2007 2:10 PM
>Subject: RE: [PSUBS-MAILIST] NR-2 Thruster Arrangement
>
>
>Brent,
>
>I am assuming, (yet to confirm), that rigging the controls will be easier
>and more intuitive with both fore and aft in the X. Joystick left, or
>joystick right, all four are powered but in different directions.
>Directional control one hand....rate (current flow) the other. Joystick
>back
>all four thrust downward for rise, joystick forward all thrust upward for
>descent.
>
>Also, for surface maneuvering, I'll get some twisting moment out of the aft
>mains in opposition. Might as well maximize this force around the vertical
>axis with a lateral as far forward as possible. I added one here..
>http://www.frappr.com/?a=viewphoto&id=269116&pid=7143130&myphotos=1
>
>Lucky for me, I'll be building all these thrusters and testing them in the
>pool long before, the sub itself!
>
>Incidentally, the only "glue" time I get on the computer, is late at night
>to do CAD work at the expense of my sleep. The rest of the time is hit -n-
>run and, drive by emails!
>
>Thanks for helping me "think" this through, I call it "walking design",
>it's
>what occupies my mind when walking around....... Drives my wife insane!
>
>Joe
>
>
>
> >From: "Brent Hartwig" <brenthartwig@hotmail.com>
> >Reply-To: personal_submersibles@psubs.org
> >To: personal_submersibles@psubs.org
> >Subject: [PSUBS-MAILIST] NR-2 Thruster Arrangement
> >Date: Thu, 26 Jul 2007 10:59:27 -0700
> >
> >
> >Good Morning Joe
> >
> >
> >I caught you glued to the computer again, didn't I? ; )'
> >
> >In regards to the NR-2 thruster arrangement, I was thinking about your
>aft
> >X thrusters and thought it might perhaps be a better and cheaper
> >arrangement for the aft thrusters to just be the basic one vertical and
>one
> >horizontal. This way you'll have the use of the horizontal thruster for
> >surface ops, without adding one in addition to the X thrusters in the
>rear
> >of your sub, like your thinking of doing in the bow. If I understand
> >correctly, the X thruster arrangement is primarily to limit the debris
>and
> >mud that would be stirred up even more by a vertical thrust causing you
> >trouble in visibility in you view ports. So since you don't have any
>stern
> >view ports that I'm aware of I thought the X thruster arrangement might
>not
> >be the best option for the stern of NR-2.
> >
> >Regards,
> >
> >Brent Hartwig
> >
> >
> >"Those are my principles. If you don't like them I have others. "
> >
> > -- Groucho Marx
> >
> >
> >
> >
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CAN-SPAM Act of 2003. Your email address appears in our database
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