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Re: [PSUBS-MAILIST] Pressure simulation
Carsten,
Did you made those simulations yourself? If yes, what program do you use?
Thanks!
Pierre Poulin
>From: MerlinSub@t-online.de (Carsten Standfuss)
>Reply-To: personal_submersibles@psubs.org
>To: personal_submersibles@psubs.org
>Subject: Re: [PSUBS-MAILIST] OSS Endcaps (Pressure hull)
>Date: Sat, 15 Feb 2003 13:51:02 +0100
>
>Hi Phil,
>
>I put two FE pictures to
>
>http://www.prismnet.com/~moki/subfiles
>
>showning a "Klöpperenboden" under outside pressure.
>This kind of Tank-endcap is the standard in europe
>- but is clear not real elliptical.
>
>For this kind of Endcap the formulation
>"need to be thicker than the cylinderical hull between them"
>is right. Should have about 10-15 % more tickness than the
>cylinder.
>
>Much better solution is that - turn the endcaps 180°..
>like )=(
>
>Tadploe has the hardtank is the center of both
>endcaps as pillar pipe - a very nice solution.
>
>best regards, Carsten
>
>Phil Nuytten schrieb:
> >
> > Re: Elliptical hull shape:
> > Alec - the other elliptical hulled sub you were trying to think
>of
> > is probably the 'Markasub' - actually, there have been a handful of
>hulls
> > in this form, over the past few decades. It is not a particularly
>efficient
> > shape re: weight/depth etc. The ellipse is not too terrible, but the
> > cylindrical transition is a killer. Ellipses (ellipsii ?) are not
>designed
> > to be butt-welded. An ellipse without the cylindrical transition ( the
>soft
> > 'corner') is a semi-sphere. They become more efficient as they become
> > deeper (obviously . . . sorry to go kindergarten for those who know this
> > stuff) in curvature for a given diameter. Full efficiency is reached
>when
> > the depth of curvature is half the diameter - a hemisphere - and
>receedes
> > again as you pass this number - half an egg.
> > I noted in a previous post that some-one said something to the
> > effect that the 'end-caps' need to be thicker than the cylinderical hull
> > between them. If the 'end-caps' are hemis, the exact opposite is true -
>and
> > if they are ellipsii ( I kinda like that word!) they are still likely to
>be
> > thinner than the tubular hull for a given depth.
> > My point?? Hmmmm . . .perhaps I don't have one.
> > Phil Nuytten
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