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RE: [PSUBS-MAILIST] Re: "working" Disney(ish) Nautilus has a Propane Tank Hull.
http://www.psubs.org/faq.html#propanetankhull
--- Jim Pesanka <jpesanka@yahoo.com> wrote:
> Hi everyone, and thanks for your replies so far.
> Very helpful.
>
> I've just learned that the Ebay sub has a modified
> propane tank for its pressure hull. I believe there
> have been discussions about that very subject here
> before. Is anyone willing to briefly outline the
> pros and cons of using a propane tank as the basic
> pressure hull for a psub?
>
> Also, I'm interested in your discussion of oval
> shaped pressure hulls, especially since the tower on
> the Ebay sub is oval shaped, and sits on a large
> oval shaped hole in the propane tank hull. Am I
> correct in assuming that might decrease hull
> strength against presssure?
>
> And can anyone tell me what a fair price of a
> Kittredge K-250 submarine might be? I've learned
> the Ebay sub takes much of it's design from the
> K-250. The owner says similar subs sell for
> $100,000.00, and he is asking $45,000.00 for the
> Ebay sub. Does that sound about right?
>
> Thanks to everyone for the assistance. This is a
> great place to get information about psubs.
>
> Jim
>
> solomon D <solomondees@yahoo.com> wrote:
> I can see what you mean about this ebay submarine.
> It
> looks as if it was built mainly for looks with no
> real
> intentions of it diving. There seems to be no kind
> of
> internal bracing that a pressure hull should have.
> If
> you added all the additional bracing, drive
> system,controls and equipment needed to really dive
> there wouldnt be any room left for a pilot. The view
> ports seem to be an after thought just cut out and
> bolted on. Who knows how well the welds were done? I
> doubt that it is even water tight on the surface.
>
>
> --- Alec Smyth wrote:
>
> > I'm afraid I wouldn't touch it, sorry. Often
> people
> > come up with ideas
> > about subs that should look cool, like say a
> fighter
> > plane or some Star
> > Wars space craft. They then try to design
> something
> > to match the
> > particular look they have in mind. But I think
> subs
> > should be designed
> > in exactly the opposite way; the laws of physics
> and
> > the limitations of
> > materials dictate most decisions, and the
> appearance
> > (unfortunately) is
> > a bit of a by-product. This sub is an entirely
> > aesthetics-driven design.
> > Notice the endcaps made of flat plate wedges, for
> > example? Those would
> > surely concentrate stresses. I would worry that if
> > someone's primary
> > motivation is the "look" of a sub, they probably
> > have not done any
> > stress calculations, used appropriate materials,
> > done full penetration
> > welds, put just the right depth on an o-ring
> groove,
> > etc., etc. The last
> > thing you want in a submarine is to go etcetera
> > hunting.
> >
> > It looks like it's nicely made, and may even dive
> > safely to a few feet,
> > but can anyone tell how many? I would not want to
> be
> > the one to find
> > out.
> >
> > :-(
> >
> > Alec
> >
> > -----Original Message-----
> > From: owner-personal_submersibles@psubs.org
> > [mailto:owner-personal_submersibles@psubs.org] On
> > Behalf Of Jim Pesanka
> > Sent: Tuesday, June 07, 2005 5:29 AM
> > To: personal_submersibles@psubs.org
> > Subject: Re: [PSUBS-MAILIST] Re: 1 (2?) man
> > "working" Disney(ish)
> > Nautilus sub on ebay
> >
> > Thanks Ian. Very informative, and I appreciate the
> > effort you went to.
> > You've given me much to think about that I
> wouldn't
> > have realized on my
> > own.
> >
> > Would anyone else care to comment on the Ebay sub
> > please? I'd like to
> > gather as many opinions as I can. Perhaps some of
> > you with actual
> > experience? Dan, Carsten, Alec. Vance, or others?
> > And also those who
> > may have not actually built a psub yet but have
> > spent some time
> > designing them. Does the Ebay Nautilus sub look
> > like a good one to you
> > or not, and why?
> >
> > I guess what I'm asking is, "What should an
> > inexperienced prospective
> > buyer (like me) be aware of about this particular
> > type of submarine?"
> >
> > Only five days left in the auction.
> >
> > Cheers!
> >
> > Jim
> >
> > Ian Roxborough wrote:
> >
> > Welcome, Jim.
> >
> > The "K250/350 hybrid" was a submarine that was for
> > sale on ebay
> > in
> > late 2004. It was close (rather subjective) to my
> > house so I
> > took
> > a look to see if it was worth buying. It was made
> > from K250
> > plans,
> > but with lots of changes from the builder (some
> > bad), it also
> > had
> > some K350 styling such as the conning tower. The
> > picture are on
> > the moki picture exchange under "2 person k250".
> >
> > Internal framing. Most pressure vessel have ribs
> > along the
> > inside
> > (or outside) of the pressure vessel. These are
> very
> > important
> > and
> > are the only reason the sub can dive deep without
> > being crushed.
> > If you look at this picture in the K250 hybrid I
> > was talking
> > about:
> >
> >
>
http://www.prismnet.com/~moki/20041127.134008/Kx50_hybrid5.jpg
> > You seen "hoops" on the inside of the
> > pressure-vessel spaced
> > every
> > so often. If you look at the picture of of the na!
> > utilus sub:
> >
> >
>
http://www.prismnet.com/~moki/20050605.153205/f9_3.JPG
> > There are no "hooks" space every so often. There
> is
> > a band on
> > the
> > inside, maybe it's for mounting equipment, but it
> > won't provide
> > much re-enforcement of the pressure vessel (even
> if
> > there where
> > many of them). This is big reason I would not dive
> > in it. Maybe
> > it's safe to pop under the water can come back up,
> > but without
> > proper ribbing it will have a shallower colapse
> > depth. The
> > colapse depth can be calculated, but any out of
> > roundness in the
> > hull will reduce it further.
> >
> > "little bottles". I meant little bolts (sorry I
> was
> > sleepy) as
> > in nuts'n'bolts. They go all the way thru the view
> > port housing
> > from the inside to the outside. This means
> drilling
>
=== message truncated ===
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