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If I might suggest one
more consideration... Should you lose one of your stern thrusters, and your
side thrusters are in the air when surfaced, you can only go in circles.
Submerged side thrusters are your Plan B to get home. But I don't think
those thrusters will be in the air.
Twenty inches is a LOT of
freeboard for a sub this size. To give you an idea, my K-250 only gets about
8-12 inches. But in addition consider this. The K-250 is only lifting a narrow
tower above the water until the main cylinder reaches the surface. At that
point, every inch of additional freeboard implies enormous lift. That's
why subs of the tower-on-cylinder configuration only lift the height
of their coning tower plus a few inches. If you see more than that
above water, it tends to be free-flooding space, not the pressure hull
itself. Your design on the other hand begins to lift the pressure hull almost
immediately because there isn't any tower. So I'd expect the freeboard to be
relatively small. Of course, ultimately it depends what size the MBTs are, and I
don't know.
Please don't take any of
this as criticism, because it simply depends what you want the sub to do.
Cousteau's diving saucers, for instance, had almost no freeboard and no plan B
method of getting home. But that was fine, because they weren't intended
for surface transits and were dropped right on the dive spot by
crane.
thanks,
Alec The contents of this e-mail are intended for the named addressee only. It contains information that may be confidential. Unless you are the named addressee or an authorized designee, you may not copy or use it, or disclose it to anyone else. If you received it in error please notify us immediately and then destroy it.
From: owner-personal_submersibles@psubs.org
[mailto:owner-personal_submersibles@psubs.org] On Behalf Of
ShellyDalg@aol.com
Sent: Thursday, May 01, 2008 1:17 PM To: personal_submersibles@psubs.org Subject: Re: [PSUBS-MAILIST] PSUBS in BoatU.S. Hi Alec. The "deck" on the front fairing is 20 inches below the top where
the hatch tube connects to the dome, or 3 inches higher than center. I don't
really know where the water line will be while surfaced, but it calculates to
about that point. Yes, that will put the side motors half out of water, while
the main motors with rudders will remain submerged. I had the mounts lower,
but I just didn't like the look of it. I want the dive planes and fairing crease
to all line up. I'll have to try it out and see how the position affects
performance. Most traveling will be powered by the rear
motors/rudders, while the side motors are mostly for maneuvering while
stationary. The rear motors will have three batteries each, and the
side motors will share a bank of three.
Only one side motor at a time will be running, unless I need a quick
burst of power ( all 4 motors running wide open ) or if I'm trying to spin on
the axis ( One powering forward, the other powering reverse with no power from
the rear motors.)
In the vertical position, the motors can pull the sub down ( reverse thrust
) or push the sub up ( forward thrust.)
The dive planes will work to dive the sub or raise it when some forward
speed is attained without running the side motors at all.
It'll be interesting to see just how fast this thing will go. I'm thinking
some where around 4 or 5 knots maybe.
Lots of trial and error, and some just plain guess work.
I won't really know till I try it out. Never drove a sub before !
One thing's for sure, I'm gonna find out.
Frank D. Need a new ride? Check out the largest site for U.S. used car listings at AOL Autos. |