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Re: [PSUBS-MAILIST] stress levels in a concrete submarine yacht hull - troll
But all in all, a little excitement won't kill anybody heh ha ha. I
think that visibility is an issue when operating a submarine.
Specially a concrete one. Luckily we are blessed with fair to very
good visibility in Norway.
Carsten, maybe this should be the first place for Euronaut to set course??
About visiting the Euronaut......I nearly lost my sleep. I would like
that very much as i think it would be great learning and inspiration
for me.
Could I bring one or two of my fellow submariners with me as well?
On 2/15/07, MerlinSub@t-online.de <MerlinSub@t-online.de> wrote:
Yes - An thin metall large ballast water tank as impact
zone in the bow area is maybe an idear for a concrete sub.
Another idear is maybe a thick PU (Polyurethane) layer (a rubber coat) of some cm thickness on the concrete. Keeps the pressure saltwater away from the concret and helps against smaller sharp impacts.
I have seen pictures of a 12 meter (30feet) sailing vessel made from thin ferrocement - get on the rocks during bad weather and was destroyed into small pieces within minutes.. On the next day the bigges item has the size of one square meter or so.
But we talk about 0,5 - 1,0 meter concret on a about 20 meter vessel.
regards Carsten
"Jay K. Jeffries" <bottomgun@mindspring.com> schrieb:
> Carsten,
>
> Understand that beyond a certain depth, lockout becomes unfeasible plus the
> decompression times become excessive.
>
>
>
> After sailing as the engineering officer on the largest ferrocement vessel
> certified for hire in the US for a year (I recognize the difference between
> ferrocement and what is being proposed here) and having to repair a
> significant hull breach due to the captain at the time's inebriation
> (drunk), I concur that the hull thickness should be designed greater than
> what is required for depth. The vessel's hull in the region of the accident
> was properly laid up with a significant amount of rebar which held together
> the crushed concrete but a large amount of water still flooded into the
> hull. A freshly tarred piece of canvas pulled around the hull and over the
> breach staunched most of the flooding until repairs could be made. The
> square-rigger was 130 ft. (40 m.) in length, displaced about 200 t., and the
> hull's ferrocement was about 180 mm in the region of the hole. The
> collision was with a channel buoy (a giving instead of a solid surface)
> which crushed an area about 20 inches (0.5 m.) in diameter. The crushed
> concrete had to be cleared out, the exposed concrete surface cleaned with
> muriatic acid, and a VERY EXPENSIVE special epoxy-sand mixture was used to
> fill the area which resulted in the patch being stronger than the
> surrounding hull.
>
>
>
> I am intrigued by what Wilfried has accomplished and would really like to
> explore further the possibilities. To lessen the impact issue, consider
> metal-skinned, external ballast tanks that vertically extend down below the
> greatest breadth of the concrete hull. The metal acts as a fender and is
> more forgiving of impacts than the concrete (easier and cheaper to repair
> also).
>
> R/Jay
>
>
>
>
>
>
>
>
>
>
>
>
>
> -----Original Message-----
> From: owner-personal_submersibles@psubs.org
> [mailto:owner-personal_submersibles@psubs.org] On Behalf Of
> MerlinSub@t-online.de
> Sent: Wednesday, February 14, 2007 7:56 AM
> To: personal_submersibles@psubs.org
> Subject: RE: [PSUBS-MAILIST] stress levels in a concrete submarine yacht
> hull - troll
>
>
>
> Hi Jay - I was thinking on a concrete realy deep diver
>
> - and for a deep diver a diver exit chamber makes no sence.
>
>
>
> I think a concrete sub should have a minimum wall thickness to
>
> resistant local impacts like from a kai or an other ship or so.
>
>
>
> So for me it is clear that a concrete sub is someone "big".
>
>
>
> Maybe an autonomus Psub - but clear not K-Size sub.
>
>
>
> regards Carsten
>
>
>
> ***********************************************************
>
>
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Best Regards
Øystein Skarholm
www.ubat.no
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