Re: [PSUBS-MAILIST] endcap/bulkhead question

["Emile" <2stroke@hetnet.nl>]

Thank you for the massive response on my question. I will re-consider the
use of it. I dont like the idea of building uncertainties in the weld. I
still think it is good fot the layout, especially for the aft end. Yes; I
planned soft ballast tanks on the other side of the bulkhead. Ian, its in
the same size, weight and performance class as your oss design. As soon I
have some good layout drawings, I will post it to moki.

Groet, Emile van Essen


----- Original Message ----- 
From: "Warren Greenway" <opensourcesub@yahoo.com>
To: <personal_submersibles@psubs.org>
Sent: Wednesday, December 17, 2003 5:01 PM
Subject: Re: [PSUBS-MAILIST] endcap/bulkhead question


> That's true. And you could solve the drag problem with
> a fairing. But...Why? They work great the traditional
> way, and without any of the other drawbacks.
>
> Warren.
>
> --- Ian Roxborough <irox@ix.netcom.com> wrote:
> > On Tue, 16 Dec 2003 10:16:38 -0800
> > Ian Roxborough <irox@ix.netcom.com> wrote:
> >
> > >
> > > Any additional stress (I'm not sure if there is
> > any), could easy
> > > taken care of by a heavy frame
> > stiffener/re-enforcing ring.
> >
> > Warren you are correct here, where would be extra
> > stress at the
> > joint of the end-cap and cylinder, but nothing that
> > couldn't be
> > off set with a heavy stiffener.
> >
> > Ian.
> >
> > > As for the displacement, it reduces displacement
> > meaning that not
> > > only have you eliminated most of the risk of end
> > cap buckling, but
> > > your sub is now lighter.  And for useful space
> > inside the sub, that
> > > is going to depend on how clever you get packing
> > things in.
> > >
> > > For people wanting to read more about inverting
> > end-caps on submarines,
> > > I would recomend reading "Pressure Vessels,
> > External Pressure
> > > Technology" by Carl T.F. Ross - Chapter 7 "Novel
> > Pressure Hull Design"
> > > (page 280).
> > >
> > >   Ian.
> > >
> > >
> > > On Tue, 16 Dec 2003 09:15:36 -0800 (PST)
> > > Warren Greenway <opensourcesub@yahoo.com> wrote:
> > >
> > > > The junction between the caps and hull "tube"
> > will be
> > > > under tremendous stress. There will be shearing
> > forces
> > > > on the wleds. Also, you are creating less
> > useable
> > > > interior space for a given displacement. I think
> > those
> > > > would be some of the basic reasons. Reference
> > Concepts
> > > > of Submarine Design for more specifics.
> > > >
> > > > Warren.
> > > >
> > > > --- Emile <2stroke@hetnet.nl> wrote:
> > > > > Hello all,
> > > > >
> > > > > For my future psub I consider an inverted
> > endcap or
> > > > > bulkhead
> > > > > See the "drawing"of the pressure part.
> > > > > ______
> > > > > )_____(
> > > > >
> > > > > At this configuration the sphere shelfs only
> > have a
> > > > > tension loading what is preferrable.
> > > > > I lookt at almost every psub design on the
> > site but
> > > > > no other sub has this configuration, exept for
> > the
> > > > > Spurdog.
> > > > > Am I wrong in my toughts and are there high
> > stresses
> > > > > in the sharp transition from the sphere shelf
> > to the
> > > > > circular hull??
> > > > >
> > > > > hope someboy knows,
> > > > >
> > > > > Emile D.L. van Essen
> > > > > www.AiResearch.nl
> > > >
> > > >
> > > > __________________________________
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>
>
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