Re: [PSUBS-MAILIST] concrete Submersible ?

[MerlinSub@t-online.de (Carsten Standfuß)]

Hi Makro nice to here from you: 

First : go to 

http://popularmechanics.mondosearch.com/cgi-bin/MsmGo.exe?grab_id=8189952&EXTRA_ARG=&CFGNAME=MssFind%2Ecfg&host_id=1&page_id=7006&query=concrete+submarine&hiword=CONCRETE+SUBMARINE+CONCRETES+SUBMARINES+SUBMARINERS+SUBMARINER+

Second : 

I have here commerzial proposal of 1994

Ellmer Wilfried
Hauptstr.17 C 
A -2344 Ma.Enzersdorf
Tel.: 02236 49952 
Österreich

He ha s allready build at least one submarine hull made from concrete: 

Hull form like airship or blimp
Length : 9,0 m 
beam   : 2,4 m 
Hull tickness between 18 cm -  8 cm (1/12 of the local hull diameter)
Weight 15 t
Upright high inside : 195 cm 
Porthole diameter : 50 cm 
Surface : Painted with GRP and Tear
concrete tenisle : 225 kp/cm2

Armierung : 6 mm Steel roundbar welded likea fishernet all 10 cm
            in the middle axis of the wall tickness. 

Destroy deep : 400 m (I am not shure how to calculate that..)

Maintance cost for hull each year : about 50 euro

Basic price for only hull : 22.000 euro (1994)

His first hull was for two years in the Attersee (Atter lake) 
in Austria without any damage - and he wrote that this was a full
operable submarine - his pictures shows just the hull very high 
out of the water. 

I don't know if he is still in bussiness, I never contact him, 
The hull itself and the description of the hull looks great 
- the technology description of the submarine technic 
is a little poor - obviously he is a man of concrete. 

third: 

At the "Deutsches  Schiffahrtsmuseum - Bremerhaven" in the outdoor
area is a tug displayed - hull complete made from concrete. 
(Wilhelm Bauer a XXI, and a Seehund, and a full Walter Plant submarine
section are also in these museum.) 

Obviously - cold weather under 0 degree (frozzen) is a problem foor 
this kind of hulls. 

I think it can be a cheap material to build sub - 
but I will not use it until - somebody over math.calculation and test
bodys, 
shown how to calculate the crush deep of a composite concrete hull. 

But maybe some engineer which normaly design "Autobahn" bridges 
has allready the right figures.  

best regards - Carsten near Bremen





Marko Thiele schrieb:
> 
> hi,
> 
> My Name is Marko Thiele and I'm new to this mailinglist. I just thought to
> introduce myself. I'm from Germany and an structural engineering student at
> the Dresden University of Technology.
> The following question I got for you folks might not sound very smart, but
> I'm serious and hope for an serious answer.
> So here it is.....
> 
> does anyone of you know if anyone has ever attempted to build a Submersible,
> Submarine or similar out of concrete ?
> (yes, I mean indeed this rock like material)
> 
> If anyone knows something about this, or thinks he knows that this has never
> been done, I would love to here from him.
> 
>  so long...
>     Marko