Re: [PSUBS-MAILIST] OSS Pressure Hull, DoubleEndcap

[Warren Greenway <opensourcesub@yahoo.com>]

You rock. Thanks for the rendering, that is cool.
A detailed 2D drawing would be great. It is Cosmos
FEA that is really giving me the headaches. I have
to rebuild all of the hull as a series of swept 
features to run the FEA. Not a huge deal, but I have
been insanely pressed for time. I am working on it,
though. I think this hull has the potential to give
you high speed, if you want it. Hey, Pierre, you
have any luck with FEA on this?

Warren.

--- Thijs Struijs <thijs-struijs@planet.nl> wrote:
> Warren,
> 
> I wonder why you can't edit the drawing. If you need
> another one in another
> format just tell me. I have send the same drawing to
> Pierre, maybe he has
> some ideas. If you realy have to rebuild the model i
> can make a detailed 2D
> drawing witch might help you.
> 
> As for the batteries i intended to place them
> outside the pressure hull. To
> give you an idea please have a look at this:
>
http://www.prismnet.com/~moki/20030319.141632/ENDXCAPSXSUBXPERSPECTIVE.jpg.
> 
> Because the vissibility in The Netherlands is very
> poor i am not looking for
> speed. I was always attracted by subs like the
> Comex, PC, Deep Worker and
> Johnson Sea Link subs. Subs that look like crabs
> with al there technical
> details exposed . It is just a matter of taste.
> Reading al the e-mails i
> know that there are a lot of fortunate psubbers
> living near cristal clear
> water. I can imagine that they would like to
> "fly"over the submarine
> landscape at high speed. With my pressure hull it 
> must be possible to
> achieve this. Instead of the "shoulder tanks" you
> could place the main
> ballast tanks behind and in front of the pressure
> hull as is done with the
> K-subs. The rear mbt can be placed in a tail.
> Underneath the MBT the
> batteries can be placed.
> 
> Stability is something that concerns me to.
> Directional stability can be
> achieved easely be adding a small tail  like on a
> helicopter or Guppy (Busby
> page 134). The sub is relatively high so the ballast
> can be placed at a very
> low point. The problem is that the weight of an
> double end cap sub is
> reletively high. Because of the big radius of the
> end caps you need a lot of
> steel compared to the volume of the pressure hull. I
> have no doubts about
> the stability under normal conditions. What concerns
> me is what happens
> after you have dropped  your ballast. It would be
> very uncomfortable to
> survice upside down. I think that a part of the
> ballast should remain under
> the hull. This is something that has to be
> calculated in a later stage.
> 
> Both types of stability can be changed afterwards.
> The first one by adding a
> bigger tail, the second one by adding some syntactic
> foam to the top and a
> little ballast to the bottom of the sub.
> 
> Greatings,
> Thijs
> 
> ----- Original Message -----
> From: "Warren Greenway" <opensourcesub@yahoo.com>
> To: <personal_submersibles@psubs.org>
> Sent: Tuesday, March 18, 2003 3:28 AM
> Subject: [PSUBS-MAILIST] OSS Pressure Hull,
> DoubleEndcap
> 
> 
> > Thijs, I finally got your hull imported. I am
> afraid
> > that
> > I can't edit the model, just view it. I will have
> to
> > rebuild the model to run FEA on it. No biggie.
> > However,
> > I am looking at that hull, and it's really growing
> on
> > me. I have gotten a professional engineering
> opinion
> > of
> > the hull design, with our application being taken
> into
> > account; it recieved high marks. The only
> potential
> > issue
> > was stability. Any input on this? A small keel
> would
> > be
> > good, and could act as a drop weight. What about a
> > short
> > tail structure? I am also trying to work out how
> much
> > battery capacity we could store inside the hull,
> since
> > this design doesn't lend itself to external
> battery
> > pods
> > cleanly. I would like any additional ideas and/or
> > input
> > concerning the Thijs pressure hull. I'll post an
> FEA
> > report when I have finished.
> >
> > Warren.
> >
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