Shanghai to San Francisco in 100 minutes by Chinese supersonic submarine

[kbd-raaf]

If you have a source, I'd love to read it.

And at what speed does that happen?

But like I said, if you were to jump out of a 3rd story window, and land on your butt (the safest body part to land on), would you prefer to land in a pool of water, or on the concrete sidewalk?

A better example, imagine going to a pool with a high springboard, say 3 stories above the ground. Imagine the difference between jumping off it and landing in the pool, or landing on the concrete beside the pool.

Look at my edit :p

 

[Lonely Hermit]

Water does not "act" like concrete at higher speeds, it FEELS like you hit concrete, that's because of the pain receptors on our skin.

Like I said, if you had to jump out of a 3rd story window, and land on your butt (the safest part of your body to fall on), would you prefer to land in a pool, or on the concrete sidewalk?

People jump into pools from great height all the time, in fact they set up springboards at high levels for people to "cannonball" into the water.

But if you tried landing on the concrete, you would probably fracture your tailbone and maybe much worse injuries.

So while it may "feel" like you fell on concrete, it is absolutely not the same thing.

Nah dude this thing is to risky for travelling by sea any object hitting a body of water at more than 1000 or 2000 Km will decimate it.
But it has incredible military application, such weapon system will be impossible to intercept & can cause havoc to naval assets.
My respect to Soviet engineers and scientist who where pioneers in such technology .

 

[Chinese-Dragon]

Professional divers can jump from a height of 85 feet (almost 8 stories), and hit the water without any injury at all.

Whereas I don't know any human being who could jump from 8 stories and land on the concrete sidewalk without dying, let alone without any injury at all like the divers can with water.

Nah dude this thing is to risky for travelling by sea any object hitting a body of water at more than 1000 or 2000 Km will decimate it.

If it's going at such a high speed I could believe it, still I would like to see a source showing at what speed exactly does this phenomenon occur.

I've checked the internet, what I found is sources saying that if you dive wrongly, and land in the pool like a "pancake" (exposing your entire frontal surface area to the water), then it can FEEL like you hit concrete, due to the pain receptors on your skin. But still you would still easily survive, despite the pain.

Whereas trying to land like a "pancake" on concrete from the same height would almost certainly kill you, considering that your head would impact at the same time as your body.

 

[trident2010]

Supersonic submarine, don't know but supersonic torpedo would be awesome. We never know if USN already have few in their arsenal.

 

[FairAndUnbiased]

Out of all the cars that have crashed into the water at high speed over the years, can you find me one example of a car that has been broken into pieces?

And do you think the hull of a submarine is much stronger than an aluminum-bodied car? Especially with regards to water?

No cars crashing into the water were ever at high speed. High speed relative to humans ability to survive, yes. High speed relative to metal, no. Also, for larger systems, the strength of materials is less important than the weight bearing structure, since there is literally no material that has the required tensile strengths to survive being hit by that much force.

A 1000+ ton object at 200 kph slamming into incompressible water (i.e. a brick wall) is going to turn anything inside it into mush and itself will be broken into pieces.

Here is why hitting concrete and hitting water is different: you are simply not strong enough to make concrete flow, while you're strong enough to make water flow. However, at high speeds and for strong materials going through a weaker material, everything can flow (see superplasticity). A good layman's explanation: Q: Why is hitting water from a great height like hitting concrete? | Ask a Mathematician / Ask a Physicist

I am no expert in impact dynamics, but I think you should be able to understand.

 

[Chinese-Dragon]

No cars crashing into the water were ever at high speed. High speed relative to humans ability to survive, yes. High speed relative to metal, no. Also, for larger systems, the strength of materials is less important than the weight bearing structure, since there is literally no material that has the required tensile strengths to survive being hit by that much force.

A 1000+ ton object at 200 kph slamming into incompressible water (i.e. a brick wall) is going to turn anything inside it into mush and itself will be broken into pieces.

I still don't get how water can be equivalent to concrete?

Does anyone have any sources detailing this phenomenon?

 

[FairAndUnbiased]

I still don't get how water can be equivalent to concrete?

Does anyone have any sources detailing this phenomenon?

See edited reply. Also experimental physics - Why is jumping into water from high altitude fatal? - Physics Stack Exchange

Also see Water jet cutter - Wikipedia, the free encyclopedia

Water can be used as an industrial grade cutting tool.

 

[MarkusS]

This idea will not work for various reasons. One is that the ocean is full life and debris. A supersonic jet usually does not encounter any object when going supersonic. A simple tuna would impact with several tons into the submarine and cause the structure to fail.

 

[Chinese-Dragon]

See edited reply. Also experimental physics - Why is jumping into water from high altitude fatal? - Physics Stack Exchange

Also see Water jet cutter - Wikipedia, the free encyclopedia

Water can be used as an industrial grade cutting tool.

You quoted an internet forum, I was wondering if there were any actual articles describing this phenomenon?

I checked myself and I didn't find any.

I'm sure jumping into water from a high enough level could certainly be fatal (it makes logical sense), but when would water become "like concrete"? What speed?

 

[MarkusS]

I still don't get how water can be equivalent to concrete?

Does anyone have any sources detailing this phenomenon?

It is called density. Water is many thousand times more dense than air. Ever saw a space ship go into the atmosphere at high speeds?

It generates shockwave and a plasma and several thousand °C. If you smash into water with high speed the water does not move away since water as any liquid is not compressible. In basic words:

When you smash with high velocity through air the air generates heat and some backforce and is like: "how rude!" but allows you to push you aside.

Water basicly says: "COME AT ME BRO!"

Incompressible flow - Wikipedia, the free encyclopedia

This is how a bullet looks like when it hits water

 

[Maravan]

I believe, the first development would be towards a torpedo which travels at supersonic speed rather than applying directly on a submarine. Chinese are investing a lot on research these days.

 

[FairAndUnbiased]

You quoted an internet forum, I was wondering if there were any actual articles describing this phenomenon?

I checked myself and I didn't find any.

I'm sure jumping into water from a high enough level could certainly be fatal (it makes logical sense), but when would water become "like concrete"? What speed?

Water doesn't become like concrete; its the other way around. Concrete starts flowing when a stronger material impacts it at a high speed. Even though it flows, it is viscous, and imparts energy back to the material. Actual scientific papers on water impacts are very sophisticated and are research level texts; water impact is actually way too hard to explain quantitatively at a classroom level.

See http://journals.cambridge.org/downl...5Xa.pdf&code=f264bc888d7f7b1b6798fcc5c0bfb3b2

for details.

 

[Chinese-Dragon]

It is called density. Water is many thousand times more dense than air. Ever saw a space ship go into the atmosphere at high speeds?

It generates shockwave and a plasma and several thousand °C. If you smash into water with high speed the water does not move away since water as any liquid is not compressible. In basic words:

When you smash with high velocity through air the air generates heat and some backforce and is like: "how rude!" but allows you to push you aside.

Water basicly says: "COME AT ME BRO!"

Incompressible flow - Wikipedia, the free encyclopedia

This is how a bullet looks like when it hits water

I've seen people shooting into water though, for example police offers will shoot a bullet into water in order to match the bullet markings with bullets they suspected were fired out of the same gun.

And the bullets go quite far? They go several meters into the water, doesn't seem much like shooting at concrete to me?

 

[MarkusS]

I've seen people shooting into water though, for example police offers will shoot a bullet into water in order to match the bullet markings with bullets they suspected were fired out of the same gun.

And the bullets go quite far? They go several meters into the water, doesn't seem much like shooting at concrete to me?

And in this video below, Mythbusters said the round they fired could have gone straight through a swimming pool and hit the concrete on the other side:

Yep, the debris of the submarine wil also go a few hundred meters. But is this your goal?

 

[Chinese-Dragon]

Yep, the debris of the submarine wil also go a few hundred meters. But is this your goal?

Well I'm sure there will be applications for this technology if it eventually matures, plus we are also working on unmanned submarines. Or maybe it could apply to long-range torpedoes.

Maybe there is some method to avoid this happening, surely the researchers must believe it, if they are still putting their time into it after all.

Maybe make the tip of the submarine/torpedo into a specific shape, made out of specific materials to prevent the bubble from collapsing, or to reduce the ill effects of a bubble collapse.