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Re: [PSUBS-MAILIST] fish shaped submarine [Was: end caps]
Hi,
thanks for all the comments Cliff.
I've posted a more up to date version of the design
that addresses these issues (adding a VBT and RTT).
The VBT and RTT are connected by a pipe and water can
be transfered between the two via a pump.
Propulsion in this version is based on a water jet
system, with the pump in the "nose" of the fish
sucking water in the "mouth" and pushing it out of
two nosels, one on either side of the hull placed
roughly where the gills would be. This propulsion
system probably isn't as efficient as a more traditional
propellor based system, but it does have it's advantages
of not being easy to foul. I did other drawings with
propellor based propulsion and various tail configurations,
in case the water jet idea just won't work. The tail
is just for maneuvering.
Missing from the diagram is the dorsal fin, the dive
plans and vertical and lateral thrusters.
The design depth is 700 feet, but I'm currently
rethinking that part in light of what I've resently
learnt about end caps. I may just use a thicker
skinned end cap.
Thanks for all the info/feed back every body,
Ian.
On Wed, 15 May 2002 08:38:12 -0500
"Cliff Redus" <dr_redus@devtex.net> wrote:
> Ian.
>
> Nice overall lines! The drag from the free flooded hydrodynamic shell will
> be low do to the streamlined profile and low cross sectional area as seen
> from a frontal position. When you start to do your weight and buoyancy
> calculations, it looks from the drawing like your CG will be significantly
> displaced aft from the CB. One way to get around this would to use
> syntactic foam aft. It looks like the orientation of the pressure hull does
> get you significant freeboard . It will be interesting to see from your
> calcs how much freeboard you can actually achieve. From the diagram, it
> looks like your calculations will also show a big movement in the CB from
> fully blown MBT to fully flooded MBT. Thus, with the current layout, you
> would have to find some way to trim longitudinally each dive. It would be
> best if CB and CG were displaced only vertically. Also I did not see a VBT.
> How are you planning on doing fine tuning to get neutral buoyancy? What is
> the pump for,VBT? What is the design depth? It looks like you are going to
> use the aft fins for propulsion. You might want to look at the work being
> done at MIT on their robotic tuna project
> http://web.mit.edu/towtank/www/tuna/brad/tuna.html. Keep us appraised of
> your progress as you cycle through your design process on this concept.
>
> Cliff
>
>
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