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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