Re: [PSUBS-MAILIST] endcap/bulkhead question

[Warren Greenway <opensourcesub@yahoo.com>]

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 
> > > 
> > > 
> > > __________________________________
> > > Do you Yahoo!?
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