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RE: [PSUBS-MAILIST] Hull Shape question
I plan on many models and a full scale mockup (probably wood) before I try
to build this thing.
There would be bracing in the hull. It would match the hull oval shape and
actually be thicker along the larger diameter arc. My initial thought was
1/4" steel for the hull. The braces would be cut from 3/8" steel welded to
the hull on edge with another flat band welded inside to form a "T" brace.
When making a scale model for pressure testing, is it as simple as dividing
the thickness of all materials by the scale? (on a 1:4 scale model, 1/4"
hull plate becomes 1/16", 3/8" brace becomes 3/32", etc.) I have plenty of
deep water right off shore I can test in. Bottom hits 4000' not to far out.
This sub is being designed with a max operating depth of about 100-150'.
Most of it's cruising will be about the 30-70' range.
Chip
-----Original Message-----
From: owner-personal_submersibles@psubs.org
[mailto:owner-personal_submersibles@psubs.org]On Behalf Of Ian
Roxborough
Sent: Thursday, June 30, 2005 9:01 AM
To: personal_submersibles@psubs.org
Subject: Re: [PSUBS-MAILIST] Hull Shape question
Something that bothers me about the oval pressure hull is: that do have
four curved surfaces with the largest arc dictating the crush depth?
or do you have a very out of round cylinder?
Wouldn't extra framing/cross beams be needed to keep the two larger arc
surfaces for being pushed in?
Finite Element Analisys might help answer some of these questions.
Also, making some small pressure-vessels and lowering them to
crush depth to make sure any results from structural calculations
or FEA match (with in reason) emperical data.
I really like the idea of playing around with noval pressure hull
designs. But, the only safe way to do this is build a few (scale
models would work) and test them to destruction. This is the only
safe way to verify the theory behind the design.
Ian.
On Thu, 30 Jun 2005 08:36:41 -0700
"Chuck Will" <chuck@bestan.com> wrote:
> Try this location. Look in the my documents folder.
> http://f2.pg.briefcase.yahoo.com/bc/aptostechnology@sbcglobal.net
>
> How do you post to Moki?
>
> Chip
>
> -----Original Message-----
> From: owner-personal_submersibles@psubs.org
> [mailto:owner-personal_submersibles@psubs.org]On Behalf Of Juergen
> Guerrero Kommritz
> Sent: Wednesday, June 29, 2005 10:17 PM
> To: personal_submersibles@psubs.org
> Subject: RE: [PSUBS-MAILIST] Hull Shape question
>
>
> Hello Chuck
> The folder is empty there are no drawings, so it is
> dificult to discuss about a drawing that is not
> available.
> Best wishes
> Jürgen
>
> --- Chuck Will <chuck@bestan.com> wrote:
>
> > Adam
> >
> > I am still trying to finalize the shape of the hull.
> > I still would like to
> > go with an oval hull. The way I am looking at it is
> > to use two fixed
> > diameters to create the oval. It will not be a
> > random oval pattern. It will
> > be created from a 48" diameter tube and a 16"
> > diameter tube. The top and
> > bottom plate will be cut from a 48" diameter tube
> > cut at the point of
> > intersection with the 16" diameter side plates. It's
> > sort of hard to explain
> > so I made a drawing. I don't know how to post to
> > Moki so you can link to it
> > at http://briefcase.yahoo.com/divetruk. Look in the
> > folder called drawings.
> > The file name is "Oval Hull Construction". The first
> > page is 2D and the
> > second page has a 3D interpretation.
> >
> > Basically I am cutting two lengthwise sections of a
> > large tube and welding
> > the to two sections of a smaller diameter tube. The
> > would be extensive
> > bracing on the interior. I also wondered how I would
> > do the hull
> > calculations for strength. Would I use the larger
> > 48" diameter for all
> > calculations? Or do I need to do some math to figure
> > a average diameter? Or
> > am I still crazy to make my hull oval? It just seems
> > to fit what I want
> > better.
> >
> > Chip
> > -----Original Message-----
> > From: owner-personal_submersibles@psubs.org
> > [mailto:owner-personal_submersibles@psubs.org]On
> > Behalf Of Adam Lawrence
> > Sent: Tuesday, June 07, 2005 5:00 PM
> > To: personal_submersibles@psubs.org
> > Subject: Re: [PSUBS-MAILIST] Hull Shape question
> >
> >
> > Hi Chip,
> >
> > An oval shaped hull would be as strong as the
> > largest raduis. So if your
> > hull is 4 feet wide and 2 feet tall it would be
> > about equivalent to
> > calculating the strength of a round hull with a 7
> > foot radius. But then this
> > isn't exactly true since you can reinforce the heck
> > out of it. But to
> > maximize the weight to opperating depth ratio and
> > usable inside space, the
> > solution converges on a round hull with simple ring
> > stiffners.
> >
> > Adam
> > ----- Original Message -----
> > From: Chuck Will
> > To: personal_submersibles@psubs.org
> > Sent: Tuesday, June 07, 2005 3:48 PM
> > Subject: [PSUBS-MAILIST] Hull Shape question
> >
> >
> > Hello everyone,
> >
> > A quick question on hull shape. I understand
> > that the best shape for the
> > pressure hull will be a sphere or a round tube with
> > braces and with domed
> > end caps. How much strength is lost with an oval
> > tube? Imagine pushing down
> > on a cardboard tube a bit. Flatten it out lengthwise
> > just a little. It would
> > have bracing inside as well. Any advice on this?
> >
> > Chip
> >
>
>
>
>
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PO Box 311
Weare, NH 03281
603-529-1100
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