Good concept, but Russia doesn't have the money to pull this off.

would and will work!
iv seen a guy build his boat out of concrete its floats fine just get the right bouynacy

The Japanese actually built an aircraft carrier in WW-II with a concrete hull, looking at the illustration I do wonder if bouancy is an issue knowing how much concrete weighs, also concrete although strong in compression, is weak in that its brittle to shock.

Originally posted by elmariachi
Good concept, but Russia doesn't have the money to pull this off.

Actually the concrete hull should cost much less than traditional steel or titanium hull.

Looks real...I don't know if I could bring myself to ride in one of these though. Sink like concrete galoshes.

A great concept, but i doubt it will ever get off the drawing board.

I've seen boats out of concrete. They work fine.
Why would you be worried about a concrete boat/sub more then a steal one? I mean sure a concrete brick sinks, but steal also sinks with out boyancy.
It also seems to me it would be easier to repair if damaged.

It does seem logical that the concept could be implemented, but what about the fact that concrete is so brittle? I mean, drop a cinder block off a two story building and the block will shatter. Now drop any alloy and it'll barely dent. Also, is concrete not succeptible to erosion?






[Edited on 5-30-2004 by WaStEdDeAtH777]

Originally posted by WaStEdDeAtH777
It does seem logical that the concept could be implemented, but what about the fact that concrete is so brittle? I mean, drop a cinder block off a two story building and the block will shatter. Now drop any alloy and it'll barely dent. Also, is concrete not succeptible to erosion?
[Edited on 5-30-2004 by WaStEdDeAtH777]

It should be no normal concrete as I said the sand is replaced with the ceramic dust plus it has kevlar armature, so I don't think it will react like a reguler concrete.

P.S. Didn't anybody have some info about the anglo-american "project HABABUK"? It was a WWII project to build a large carrier from ICE!!! (well it was actually pykrit=86% ice and 14% cellulose). The smaller working model was built, but the thing was too expensive so it was cancelled. I googled for more info but was unable to find anything.

[Edited on 30-5-2004 by longbow]

Actually I bet it will work, and Russia may rpodece more if they get some money...

Wasnt there disposable concrete ships back in WW2 called Liberties?

Are those Shkval torpedoes launched vertically?!
What could be the purpose?
Logic (my logic ) would dictate that supercavitation would work better with horizontally launched devices..

Originally posted by WaStEdDeAtH777
It does seem logical that the concept could be implemented, but what about the fact that concrete is so brittle? I mean, drop a cinder block off a two story building and the block will shatter. Now drop any alloy and it'll barely dent.

That's because tension forces occur, under compression concrete is extremely strong. When subjected to the large presssures under water, you'll need to superpose a lot of tension forces to make the overall net tension force negative and the concrete brittle.

i was actually gonna post a thread on this earlier but forgot about it.

I doubt a country even as financially troubled as russia would have much difficutly in constructing one (or more) of these. Concrete can be produced dirt cheap just about anywhere, and there nothing especially cutting edge about the technology by any means. The whole idea about these things is that they hunt passively, sitting on the sea bed waiting for shipping to pass nearby, hence the vertical launch tubes. Imagine what iran could do with a few of these sitting in the arabian gulf.

the only thing i can think of why they wouldnt work would be these shkval torpedos. Although the sub can withstand sinking to the 1800 ft "crush depth", im not sure about a think skinned metal torpedo. Also seeing they allegedly travel at 230 mph (vertically), whats to stop the immense water pressure compacting it to the size of a cola can as soon as it leaves the launch tube?

Wouldn't a concrete sub absorb more sonar waves then steel, making it less vi sable? The sound deadening of interior noises would be better too.

These could be a good sub to use, seems to have a lot of advantages over steel.

We used to have a 'concrete' boat, it was an excellent sea boat. The material used to create these boats is called Ferrocement it has a steel mesh core. It is widely accepted to be a fine material for marine use as it flexes a lot more the Steel, so its not as bad if you hit something. The only problem is that the average life expectancy of this material is only 50 years, after that the Ferrocement starts to return to its natural state.

I don't think Iran would really get as much use out of it as some other countries. Verticle torpedos and a stupidly high crush depth indicate it could use the depths of the ocean as it's hunting grounds, always trying to stay below any other threats, and shooting up.

As for crushing torpedos, I was under the impression that torps were flooded anyhow, thus equalising the pressure?

Seems plausible but not an entirely good idea because who in the world wants verticaly launched torpedoes, and the propulsion seems to me like it would be very slow. I don't know.