Yuan Class AIP & Kilo Submarine Thread

[Hendrik_2000]

And what is filled between the two hulls?
If your answer is ballast water then what do you think will happen when they blow the ballast water out between the hulls to gain bouncy ?
If your answer is fuel then again what happens as you use fuel and the space between the two hulls becomes empty?
Basically your illustration and more importantly the equation written within fails within the situation I had wrote above.
More over double hull does not mean an interior hull is completely shelled inside by an outer hull.

It will gain height so the h in the rho X g X h= getting smaller since the h is measure from water surface. So the pressure on the outer hull is getting smaller too

 

[Engineer]

And what is filled between the two hulls?
If your answer is ballast water then what do you think will happen when they blow the ballast water out between the hulls to gain bouncy ?

Pressurized air will displace the ballast water, and the air will end up having the same pressure as water pressure on the other side of the outer hull. That's how water is forced out. The equation will still hold.

If your answer is fuel then again what happens as you use fuel and the space between the two hulls becomes empty?

The empty space is filled with water.

Basically your illustration and more importantly the equation written within fails within the situation I had wrote above.
More over double hull does not mean an interior hull is completely shelled inside by an outer hull.

Actually, the illustration and equation represent how the physics works in real life. It is you who couldn't get your head wrapped around the concept. Also, the ballast tank only comprises of small portion of the space between the inner and outer hulls. For space which is neither ballast or fuel tanks, water has a lot of liberty flowing in and out.

 

[jobjed]

And what is filled between the two hulls?
If your answer is ballast water then what do you think will happen when they blow the ballast water out between the hulls to gain bouncy ?

The fluid between the outer and inner hulls doesn't matter. High pressure air can be substituted and still ensure that the pressure differential between both sides of the outer hull remain much lower than that subjected to the inner hull.

Also, a positive pressure stretches the outer hull which puts tension on it instead of compression. All thin-walled metal cylinders/spheres are stronger under tension than compression.

 

[FORBIN]

And what is filled between the two hulls?
If your answer is ballast water then what do you think will happen when they blow the ballast water out between the hulls to gain bouncy ?

Alright, genius.

Since pressure differential between the two sides of the outer hull is negligible, total shear forces and bending moments are negligible. Thus, the outer hull has no need to be anywhere near as solid as the inner hull.

If your answer is fuel then again what happens as you use fuel and the space between the two hulls becomes empty?
Basically your illustration and more importantly the equation written within fails within the situation I had wrote above.
More over double hull does not mean an interior hull is completely shelled inside by an outer hull.

All or almost water i am certain but don't going for complicated scientist explanations the fact is to dive at greater depths ( 600 m max ) it is more safe more resistant only the Seawolf can reach same depth as the best Russians nucl subm.

 

[SamuraiBlue]

The fluid between the outer and inner hulls doesn't matter. High pressure air can be substituted and still ensure that the pressure differential between both sides of the outer hull remain much lower than that subjected to the inner hull.

Also, a positive pressure stretches the outer hull which puts tension on it instead of compression. All thin-walled metal cylinders/spheres are stronger under tension than compression.

And where do you store the high pressure air when not in use?
Don't tell me it is in the inner hull.
In normal pressure the volume of air will expand accordingly to the amount it is pressurized.
So if the air is compressed by 60 times then it will expand 60 times in normal pressure.

You can also see in this picture here there is no inner hull unless all that space between the tanks and frame is the space between the hulls which also doesn't make sense since you can see the forward hatch with no tube under connecting into the inner hull nor an opening below.

As for the vid, you must be joking.
Design and construction methods of subs had radically changed from 1955(Hell the Compression stir welding method I mentioned early only came in use in the 90's). So unless PRC is still utilizing methods of that era (which I doubt) it has little substantial value.

 

[Engineer]

And where do you store the high pressure air when not in use?
Don't tell me it is in the inner hull.

There are special gas cylinders outside the inner hull to store high pressure air.

In normal pressure the volume of air will expand accordingly to the amount it is pressurized.
So if the air is compressed by 60 times then it will expand 60 times in normal pressure.

Your point being?

You can also see in this picture here there is no inner hull unless all that space between the tanks and frame is the space between the hulls which also doesn't make sense since you can see the forward hatch with no tube under connecting into the inner hull nor an opening below.

Your inability to distinguish the inner hull does not mean there is no inner hull. Yes, that volume underneath the frames is part of the space between the inner and outer hull.

As for the vid, you must be joking.
Design and construction methods of subs had radically changed from 1955(Hell the Compression stir welding method I mentioned early only came in use in the 90's). So unless PRC is still utilizing methods of that era (which I doubt) it has little substantial value.

The video shows the fundamental principles of how a submarine works. Improvement in design and construction techniques do not alter the fundamental principles. That makes the video relevant as ever.

 

[jobjed]

And where do you store the high pressure air when not in use?
Don't tell me it is in the inner hull.
In normal pressure the volume of air will expand accordingly to the amount it is pressurized.
So if the air is compressed by 60 times then it will expand 60 times in normal pressure.

The air is stored in air tanks under high pressure. Where the hell do you think they're stored?? And what does the ideal gas law have to do with construction method of a submarine's outer hull?

You can also see in this picture here there is no inner hull unless all that space between the tanks and frame is the space between the hulls which also doesn't make sense since you can see the forward hatch with no tube under connecting into the inner hull nor an opening below.

Are you blind?

Do you not see the blatantly obvious tube leading from the hatch to the space below?


What are you trying to argue? It's basic knowledge that the outer hull of a double hull submarine doesn't require near the structural strength of the inner hull. What you're seeing in the photographs is the assembly of the outer hull. What is so hard to understand??

 

[dingyibvs]

We might have a Japanese b787 here.

 

[Richard Santos]

A person who evidently knows so little about submarines and yet who is so pompously confident in his manner of rhetorical questioning seems unlikely to be worth engaging in any conversation about the subject.

 

[antiterror13]

A person who evidently knows so little about submarines and yet who is so pompously confident in his manner of rhetorical questioning seems unlikely to be worth engaging in any conversation about the subject.

Yes, thats quite common .. he (@SamuraiBlue ) does it all the time for anything regarding China advancement. He acts like the expert of everything ... in fact .... he is definitely NOT