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Re: [PSUBS-MAILIST] OSS Endcaps (Pressure hull)
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