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Re: [PSUBS-MAILIST] OSS Pressure Hull
Warren, I'm interested in designing the basic pressure-hull, but
because I'm never built a pressure-hull before and I don't have
a copy of the PVOH AMSE standard, I don't want to design the actual
metal, I'd prefer that's done by somebody with experience.
I will:
* base the design around the human posture shown here:
http://www.psubs.org/pic/humaneng.html
* Solicit the information require to complete the design
from the the mailing list.
* design the geometery, layout and calculate the dimentions.
* try to keep it simple and realistic.
* make a guestimate of the metal thickness and ribs.
This should be enough to design all the other parts. So the
final pressure-hull metal can be calculate/designed last.
Maybe there is enough weight left at the end to design the hull
without any framing and still be possible to tow without a
monster truck.
Ian.
On Tue, 21 Jan 2003 00:26:42 +0800
"Warrend Greenway" <dub@linuxmail.org> wrote:
> Well then, best of luck Alec! The OSS will still be around when you
> are finished with your present project...And we'll be glad to have
> your input!
>
> Warren.
>
> > Yep. Its not that I didn't have a pressure hull design to begin with, its just that I treated it as very much a draft until the other stuff was a known quantity. As I completed components I would weigh them (in one case going so far as to weigh them submerged in a tub of water) and recalculate the hull. At least in my design, weight is the absolutely critical factor. I have a fudge factor of only a few hundred pounds in a boat that weighs 3,000.
> >
> > BTW I really would love to volunteer for the hull position but just don't have the time, due to the construction of my own boat. In fact, I don't even have time to keep up with all these posts, and caught Ian's just by chance.
> >
> > On the other hand when my sub is complete and proven to work, I do intend to put its design in the public domain, so it will be "open source". But its a poor candidate for THE open source design, as its of very specific applicability and probably not of interest to the general PSUBer.
> >
> > rgds,
> >
> > Alec
> >
> > -----Original Message-----
> > From: Ian Roxborough [mailto:irox@ix.netcom.com]
> > Sent: Sunday, January 19, 2003 7:04 PM
> > To: personal_submersibles@psubs.org
> > Subject: Re: [PSUBS-MAILIST] OSS Pressure Hull
> >
> >
> >
> >
> > Once you know what all the other systems are going to
> > weight and the volume they will displace, you can use
> > up the remaining weight allowance on the pressure hull.
> >
> > You would still want to know the specs, such an estimate
> > of the displacement, basic layout/dimensions, etc.. But
> > the actually metal design part, thickness of the steel,
> > spacing of the ribs, design of the ribs/frames, the
> > end cap style and the placement of the thru-hulls don't
> > have to be designed until later on.(?)
> >
> > If I remember correctly, Alex Smyth designed this submarine
> > this way.
> >
> > Ian.
> >
> >
> > On Mon, 20 Jan 2003 07:31:06 +0800
> > "Warrend Greenway" <dub@linuxmail.org> wrote:
> >
> > > Huh? Why do you suggest that?
> > >
> > > Warren.
> > >
> > > >
> > > > I'm wondering what other people think about designing
> > > > the pressure-hull after some of the other systems
> > > > have been designed, maybe even designing it last?
> > >
> > > >
> > > > Ian.
> > > >
> > > >
> > > >
> > > > On Mon, 20 Jan 2003 05:07:12 +0800
> > > > "Warrend Greenway" <dub@linuxmail.org> wrote:
> > > >
> > > > > Is anyone interested in volunteering for the pressure hull design positions?
> > > > > We need a Lead of Design, and developers. Once a pressure hull team comes together,
> > > > > you can revist the hull concept if you desire, and design the hull anyway that is
> > > > > compatible with the weight/cost/depth constraints. If any one is interested, please
> > > > > post or e-mail me. I will be posting a supplementary document that will describe
> > > > > Lead and Developer opening.
> > > > >
> > > > > Warren.
> > > > > --
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