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[Fwd: Re: Building concrete subs]

Here's some more comments from the boatbuilding newsgroup.

-- 
Martin Sanderse
---------------
http://www.interlog.com/~sanderse/

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I'm guessing if a non-ferrous reinforcement of some kind were used, for all
practical purposes there wouldn't _be_ a magnetic signature.
On Fri, 15 Jan 1999 15:01:42 GMT Dan Bollinger of Wabash Men's Council
wrote this re Re: Building concrete subs:
>More importantly, concrete subs would be more difficult to sense
>magnetically.   And they would have less of a magnetic signature.  A steel
>sub can be identified as a specific boat by its signature, that's one
>reason they are demagnetized occasionally.
Scott A. Miller
samiller@bix.com samiller@cyberenet.net
card carrying member of the Java Conspiracy
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OK but concrete does not become "stronger under pressure".

Tom MacNaughton
Naval Architect
http://www.macnaughtongroup.com

Potbelly50 wrote in message
<19990115084146.23588.00005108@ngol01.aol.com>...
>
>I thought the ng might find this interesting:
>
>
>Concrete submarine
>
>
>
>Russian submarine designers are building military submarines out of
concrete.
>They say the new designs will save money and solve several problems with
>conventional steel-hulled subs.
>
>Because concrete becomes stronger under high pressure, such submarines
(C-subs)
>could settle down to the bottom in very deep water and wait for enemy ships
to
>pass overhead. Concrete would not show up on sonar displays (it looks just
like
>sand or rocks), so the passing ships would not see the sub lurking below.
>
>US and British military experts are concerned that poor countries may build
>C-subs and use them to blockade shipping routes or threaten military
vessels.
>
>An article about C-subs, with great cutaway views:
>http://popularmechanics.com/popmech/sci/9812STMIP.html
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He might be refering to the fact that concrete is strong in the
compression mode.  It's not good at all under tension unless
pre-stressed.
Jim

macnaughton.com wrote:
> 
> OK but concrete does not become "stronger under pressure".
> 
> Tom MacNaughton
> Naval Architect
> http://www.macnaughtongroup.com
> 
> Potbelly50 wrote in message
> <19990115084146.23588.00005108@ngol01.aol.com>...
> >
> >I thought the ng might find this interesting:
> >
> >
> >Concrete submarine
> >
> >
> >
> >Russian submarine designers are building military submarines out of
> concrete.
> >They say the new designs will save money and solve several problems with
> >conventional steel-hulled subs.
> >
> >Because concrete becomes stronger under high pressure, such submarines
> (C-subs)
> >could settle down to the bottom in very deep water and wait for enemy ships
> to
> >pass overhead. Concrete would not show up on sonar displays (it looks just
> like
> >sand or rocks), so the passing ships would not see the sub lurking below.
> >
> >US and British military experts are concerned that poor countries may build
> >C-subs and use them to blockade shipping routes or threaten military
> vessels.
> >
> >An article about C-subs, with great cutaway views:
> >http://popularmechanics.com/popmech/sci/9812STMIP.html
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Potbelly50 wrote:
> 
> I thought the ng might find this interesting:
> 
> Concrete submarine
> 
> Russian submarine designers are building military submarines out of concrete.
> They say the new designs will save money and solve several problems with
> conventional steel-hulled subs.
> 
> Because concrete becomes stronger under high pressure, such submarines (C-subs)
> could settle down to the bottom in very deep water and wait for enemy ships to
> pass overhead. Concrete would not show up on sonar displays (it looks just like
> sand or rocks), so the passing ships would not see the sub lurking below.
> 
> US and British military experts are concerned that poor countries may build
> C-subs and use them to blockade shipping routes or threaten military vessels.

OK, but just how brittle is it? One close hit with a depth-charge and
'crack' maybe?
 
> An article about C-subs, with great cutaway views:
> http://popularmechanics.com/popmech/sci/9812STMIP.html

-- 
Paul Hovnanian (here)    mailto:hovnania@bcstec.ca.boeing.com
               (there)   mailto:Paul@Hovnanian.com
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