Re: [PSUBS-MAILIST] OSS multi-ring-size hull

[Ian Roxborough <irox@ix.netcom.com>]

Warren, putting a solid deck in you sub doesn't change
the displacement at all.  If you where planning to flood
part of your large pressure-hull that would allow you
to reduce the dry weight, but why bother building such
a large hull just to flood half of it...

Ian.

On Fri, 17 Jan 2003 01:06:11 +0800
"Warrend Greenway" <dub@linuxmail.org> wrote:

> Uhhh. That would be too heavy, obviously. Are your calculations
> assuming that the 2 meter section would be hollow? I mean, I was
> assuming that the 2 meter section had a solid deck in it, thereby
> reducing displacement.  Also, I did take my own advise and try the
> mock-up idea. 2 meters would be nice, but that sections of the hull
> would be just fine at more like 1.25 meters long by 1.8 meters, with
> a corresponding drop in the size of the smaller section. If this 
> displacement problem were resolved, which I believe it can be, do you
> see any other problems with the general layout? Like I said, a deck
> would be used inside to reduce volume, since it is really the width 
> that is nice, the height can be reduced by .5 meters to reduce volume
> and provide ballast.
> 
> Warren.
> 
> > Warrend Greenway schrieb:
> > > 
> > > I would like input on the hull concept I have drawn up. The link is:
> > > 
> > > www.restorides.com/~dub/
> > > 
> > > This is bouncing off the modular idea. The bow is a minimal length endcap
> > > in this concept. The main hull with hatch is 1.5 long by 2 meters in diameter.
> > 
> > Just 4,83 ts (10662 pd) (salt water)
> > 
> > > The smaller section of hull is 2.5 meters long by 1 meter in diameter. 
> > 
> > Easy additional 2,01 ts (4437 pd) (sw)
> > 
> > maybe some more 1,5 ts (3311 pd) for the rest.
> > 
> > so just a 8,34 ts boat with a maybe (?) 1 ts trailer.. all together =
> > 20618 pd. 
> > 
> > 8,34 its the weight of about 5 Kittredge size subs. 
> > 
> > regards Carsten
> > 
> > > The
> > > entire tail section would be a bolt on modular unit. Ballast tanks, battery pods,
> > > HPA tanks, etc. would be arranged against the hull at the thin section to "flesh"
> > > out the entire hull to approx same diameter. A fiberglass fairing would then cover
> > > the aft section. Does this help?
> > > 
> > > We need to get a pretty firm grasp of our basic pressure hull, including weight
> > > and dimensions before we can finalize the preliminary design. The refined hull
> > > design would then be undertaken in parallel with the other major units. Note:
> > > I did not add flange seams, I am assuming that they are inside. I talked to a
> > > highly respected mechanical engineer at work and he had some compelling flange
> > > ideas that necessitated the flange being internal.
> > > 
> > > Warren.
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