Military Review

Japan is going to develop a railgun for missile defense

71

The photo is illustrative.


Japan is set to start developing an electrically powered railgun that will fire projectiles at six times the speed of sound and shoot down hypersonic missiles soon. The country's authorities allocated $56 million for the railgun project.

The Japanese Naval Forces Command told The Mainichi that the railgun will use electromagnetic force to rapidly accelerate and launch a projectile.

Why did the Japanese military decide to focus on the railgun?

First, there are financial considerations: firing a railgun will cost a lot less than launching a rocket. Secondly, they were interested in the very idea of ​​a new type of weapon. However, during the implementation process, the project may encounter a number of difficulties. For example, power consumption, cooling and mobility of such an installation will be problems. It is still very difficult to imagine how the railgun will be deployed online.

In the United States, at one time, they also thought about creating a railgun. The US Navy spent 10 years and about half a billion dollars but eventually abandoned the railgun project and focused on hypersonic missiles. But Japan is the bad experience of the American fleet does not install. The Ministry of Defense of the country reported that they plan to seriously study the combat capabilities of railguns, primarily from the point of view of their use as a means of destroying hypersonic missiles.

Obviously, Japan associates the risks of hypersonic missile strikes with neighboring China and Russia, as well as the DPRK. It is these countries that are considered in Tokyo as sources of potential danger to the state. In addition, the military department of the country expects to use railguns to protect against ship attacks.

Of course, railgun projectiles cannot be controlled like rockets, but they can be fired quickly and continuously, and the projectiles themselves are small and cheap to manufacture. These aspects interested the Japanese military: the country has been researching railguns since 2016. As a result of the development, the projectile speed was increased, work began on the technology of a stable projectile flight and automatic firing.

Research is planned until 2028. Therefore, the appearance of a railgun is not a matter of the near future. Right now, railgun technology is much less advanced than rocket technology, according to University of Arizona professor Braden Allenby. At the same time, the expert admits that the railgun can offer the armies of the world more effective firepower for less money.

Since the technology of railguns is still not developed, a more reasonable solution, according to Professor Allenby, is to deploy missiles in the short term. But this does not negate the importance of investing in the development of railguns, if there are opportunities and money.
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  1. rocket757
    rocket757 24 January 2022 09: 26
    +4

    Japan is going to develop a railgun for missile defense
    . Against missiles, that's cool!
    The main thing here is to accurately calculate the trajectory of the target ... this is, among other things.
    In general, the task is not trivial!
    1. Russian German
      Russian German 24 January 2022 09: 29
      +2
      "Sho? Again?" Mattress covers have already tried - they abandoned this idea.
      1. mitroha
        mitroha 24 January 2022 09: 31
        +3
        That was the news already. I don’t repeat twice, I don’t repeat ..?
      2. rocket757
        rocket757 24 January 2022 09: 33
        +5
        And what is unusual, new in this ... will happen again and again.
        There will be a competition / confrontation, who wins.
        So far, as most often, new strike systems are ahead, only then do systems appear that can effectively deal with them ...
        True, by that time, often, new strike systems appear, against which again there is no effective countermeasures.
        The process will take forever.
        1. Russian German
          Russian German 24 January 2022 09: 37
          +1
          I agree. This is an eternal process. Of interest is also the opinion of the comrade "Zoldat A" (presented below). I think he is right about something.
          1. tikhonov66
            tikhonov66 24 January 2022 12: 38
            +2
            "...
            The Japanese Naval Forces Command told The Mainichi that the railgun will use electromagnetic force to rapidly accelerate and launch a projectile.
            ..."
            The "triples" in physics told the "losers" - what is "electricity" and "Ampere force" - in general, and what is a "railgun" - in particular ...
            - But they "did not tell" them - what is the "SCATTERING of projectiles", what their "railgun" will have - and how many shots (and "electricity") it will need to hit hypersonic with a probability - at least 50% - the target during its stay in the sector of destruction of that same "railgun" ...
            8-)))
            - a! and one more thing - for how many shots that "railgun" has - its rails are enough ...
            8-))
            1. Arg107
              Arg107 24 January 2022 17: 02
              0
              If you really shoot with rails, then not from a railgun, but, for example, from an electromagnetic ballista, or charge electromagnetic ballistas (charged with rails) into an atomic trebuchet.
              1. tikhonov66
                tikhonov66 25 January 2022 12: 18
                -1
                "... If you shoot with rails,
                ..."
                - in conventional artillery - there is the concept of "barrel wear" well, or "barrel height"
                The inner surface of the barrel - you know, when fired, it falls into very stressful "conditions of existence" - and wears out very much.
                Therefore, for accurate shooting - when calculating the initial velocity of the projectile, barrel wear is always taken into account ... And the more it is, the lower the initial velocity of the projectile. And after the prescribed number of shots - the barrel of the gun must either be replaced, or the so-called. "returning", when only the rifled cylindrical barrel liner is replaced, which is much cheaper, but technologically much more complicated and longer.
                - So, at the "railgun" - the working conditions of the "rails" - WHERE, AS HARDER / heavier than those of the gun barrel in conventional artillery. The fact is that when a railgun is fired, the projectile MUST SLIDE ON RAILS. And the tighter the rails are pressed against the projectile - the lower the resistance between the rails and the projectile - and therefore the higher the efficiency of using current. But if you press too hard, then friction losses increase greatly, leading to heating of both the rails and the projectile - and to INCREASED WEAR OF THE RAILS. Vooschem - there (as in most other places) it is necessary to seek a compromise ... And this is just one time. And "two" is that when the "railgun is fired" - GIANT currents flow along the rails and the projectile - hundreds of thousands of amperes. Therefore, no matter how you press the projectile to the rails, and the contact of the projectile with the rail, all the same will have a resistance higher than the projectile itself and the rails. Therefore, the surface layer of the rail - at the point of its contact with the accelerated / fired projectile - will 1) heat up, 2) wear out 3) be subjected to UNUNIFORM WEAR (erosion), which will lead to deterioration of electrical contact, a drop in efficiency, increased heating, and rapidly progressive wear . Those. in a good way - after a few shots - the rails must be GRINDED.
                - in general, the life of the rails in the "railgun" - it is short IN PRINCIPLE. Or, as they say in auto repair shops - the rails in the "railgun" are a CONSUMABLE MATERIAL ...
                8-))
    2. The comment was deleted.
    3. Orel
      Orel 24 January 2022 09: 39
      -2
      Quote: rocket757
      . Against missiles, that's cool!
      The main thing here is to accurately calculate the trajectory of the target ... this is, among other things.
      In general, the task is not trivial!


      The United States thought about lasers on missile defense. Japan is also inventing something. I think we are also inventing weapons based on new physical principles. It’s another matter that we traditionally don’t talk much, they already say when there are more or less real samples, and in the West there are more open military budgets and even at the start they already tell what they are going to test or create.
      1. rocket757
        rocket757 24 January 2022 10: 03
        -2
        As it is now in a new way, they cover it, I do not quite agree.
        Sometimes it is useful to intimidate / remind the enemy that he will definitely get hit by the horns, and this is what misinformation will do !!!
        But military secrecy must be observed! A trump ace up the sleeve can be very useful in many situations.
      2. Klingon
        Klingon 24 January 2022 10: 24
        +7
        On what other NEW physical principles? What did they discover new laws in physics? It is correct to speak not on new on OTHER physical principles. And then there is confusion smile... Or do you mean phasers, disruptors, metreon cascade, gravitational-relativistic transducer and thelaron radiation? wassat
        1. Arg107
          Arg107 25 January 2022 12: 24
          0
          Does the discovery of a new law related to a physical principle make that principle new? Physical principles exist regardless of our awareness of them (your cap).
      3. tikhonov66
        tikhonov66 24 January 2022 12: 45
        0
        "... Japan is also inventing something. I think we are also inventing weapons based on new physical principles.
        ..."
        It's important to understand the difference here.
        "Technologically backward" Russia - invents weapons on "new physical principles",
        and the "technologically advanced" USA and Japan are inventing weapons on "old propaganda principles". Moreover, using the same 2 fairly well-worn RAKE "transferred to each other (from our military-industrial complex - to your military-industrial complex)" as a "relay baton".
        8-))
        - Good luck to the Japanese military-industrial complex - "in the hypersonic cut" of the Japanese defense budget ...
    4. for
      for 24 January 2022 09: 39
      -3
      Quote: rocket757
      The main thing here is to accurately calculate the trajectory of the target

      And that the projectile cannot be made controllable?
      In general, the task is not trivial!

      Trivial, but the topic is not closed yet.
      1. rocket757
        rocket757 24 January 2022 10: 06
        +3
        Have you read about the railgun? What BLUE SHEETS are fired from it?
        The disc overclocking system itself is very extreme, not every material can withstand this, and there’s no talk about some kind of smart stuffing !!! There are no such technologies that would save something "smart" from such a powerful impact.
        Not yet, and not likely to soon.
        1. for
          for 24 January 2022 10: 54
          -3
          Quote: rocket757
          What BLUE SHEETS are fired from it?

          Have you read about guns that once fired cannonballs.
          1. rocket757
            rocket757 24 January 2022 10: 58
            -1
            You asked, they answered you .... what's wrong?
            If, I, I don’t ask about the guns of the times of Tsar Peas ... the conclusion is obvious.
      2. tikhonov66
        tikhonov66 24 January 2022 13: 15
        -1
        "... And that the projectile cannot be made controllable?
        ..."
        - Yes, you can...
        Here it is only necessary to solve two very technically "evil" problems
        1) the passive projectile of the "railgun" can only be controlled by "aerodynamic surfaces" that will either heat up TERRIBLY, experiencing TERRIBLE axial pressures from a supersonic oncoming flow - this is if they are placed in the nose cone area, or they will be TERRIBLY ineffective if they are placed closer - so to speak "to the stern" of the projectile. Supersonic flow, however - there (immediately behind the shock wave from the nose cone) - almost a vacuum ... Moreover, as the projectile speed decreases on its trajectory, the angle of inclination of the shock wave cone to the projectile flight axis will continuously change .. .
        2) on fairly SHORT rails of the "railgun" - its projectile must accelerate from rest to the first space velocity (8 km / s). In conventional artillery - with approximately the same barrel lengths, the projectile accelerates to 1-3 speeds of sound (1 km / s). This gives an acceleration / overload - about 10.000 G. For a "railgun" - the acceleration will be about 100.000 G. This means that, say, an aerodynamic rudder of a projectile - weighing 1 gram (which cannot be - will instantly burn out and bend by the pressure of the oncoming flow ) - when accelerating along the "rails" - it will "weigh" 100 kilograms ... And all the control equipment, wires, power supplies, mechanical drives - everything will "weigh" 100.000 times more (and this is not taking into account the pressure of the oncoming flow, which will be with this "weight" - FOLD!). And after such "pressure" (or better to say IMPACT) - all this "control stuffing" should KEEP working ...
        3) a guided projectile of a "railgun" - it needs to be controlled ... well, if it is controlled ... And with a supersonic flow around - ANY such projectile flies IN A CLOUD OF GLOWING ionized gas - the so-called plasma. "Ionized" means electrically conductive. And "conductive" - ​​this means SHIELDING radio waves. The glow of the plasma cloud - and the plume of burning remnants of the fairing - make it impossible to control the projectile through the optical channel. And the screening of the projectile by a plasma cloud makes it impossible to control the projectile over the radio channel ...
        - and only "area shooting" remains, which compensates for the scattering of shells - by their number. In classical artillery - shooting at areas is effective due to the RATE OF FIRE (battery ... five shells ... runaway ... FIRE!).
        But with the rate of fire of the railgun ... (limited by the power of the power source and the speed of charging the storage capacitors) - "shooting at the areas" is possible only at a FIXED target ... As in the days of dreadnods.
        - somehow like this.
  2. Zoldat_A
    Zoldat_A 24 January 2022 09: 29
    +3
    I suspect that the Americans understood the stupidity of the project - at least at today's technological level. And they managed to somehow interest the meticulous Japanese - let them tinker. Perhaps, what they pick up.
    Anyway, if the Japanese for 56 lyams think of what the Americans didn’t think of for a pollard, America will be able to use it without any problems as its own.

    Does an occupied country have rights?
    1. rocket757
      rocket757 24 January 2022 09: 36
      0
      Now the next ones will try to prove that they are smarter ... what a wonder.
  3. grandfather_Kostya
    grandfather_Kostya 24 January 2022 09: 29
    +4
    With aiming this "brontosaurus" at a fast-flying target, they are tormented!
    1. rocket757
      rocket757 24 January 2022 09: 35
      0
      There will be more than one problem!
      Well, someone else wants to prove that they are the smartest .... nothing new, in general.
      1. Egoza
        Egoza 24 January 2022 09: 57
        +4
        Quote: rocket757
        Well, someone else wants to prove that they are the smartest .... nothing new, in general.

        If the Japanese are so "smart", let them finally deal with their Fukushima. There's an accident again! And then they think about air defense.
        1. rocket757
          rocket757 24 January 2022 10: 11
          +1
          Welcome soldier
          Yesterday they showed that the problems with the emissions of all sorts of rubbish into the external environment, the problem has not been solved in any way.
          They seem to want to build a wall ... so it's not fast, anyway ....
          In general, they have worries above the roof and so, but, they try, their militaristic ideas in one place and itching.
          Alas, alas, they are offended by the whole world, and the big brother just does not wipe his feet about them ....
        2. sharp-lad
          sharp-lad 24 January 2022 22: 52
          +1
          Yapi is accustomed to radiation, it is good for them! laughing
    2. agond
      agond 24 January 2022 09: 41
      +2
      It is easier to make a railgun as an attack weapon, in the form of a tunnel with an inclination in the right direction, or to lay a tunnel along a mountainside, but this is a stationary version, and for air defense it is necessary to change the direction and throwing angle, this greatly complicates and limits the size of the installation.
      1. Zoldat_A
        Zoldat_A 24 January 2022 09: 52
        +3
        Quote: agond
        It is easier to make a railgun as an attack weapon, in the form of a tunnel with an inclination in the right direction, or to lay a tunnel along a mountainside, but this is a stationary version, and for air defense it is necessary to change the direction and throwing angle, this greatly complicates and limits the size of the installation.

        In my opinion, this is a modern version of the German "Colossal" and "Dora" - the same monster, the same useless thing in operational and tactical terms.

        Maybe, over time, with the development of technology, it will be possible to come up with something compact and not so clumsy. The idea is tempting - to fly through a pumpkin aircraft carrier. But for now... request
        1. rocket757
          rocket757 24 January 2022 10: 18
          +1
          Quote: Zoldat_A
          But for now...

          Now many developments are in the same situation, until justified, for objective reasons.
          For the future, probably.
    3. Thorvlobnor IV
      Thorvlobnor IV 24 January 2022 09: 59
      +4
      Aiming an unguided projectile at a fast target flying by and flying straight at you are two big differences, as they say in Odessa. In the second case, the angular velocity is minimal and the problem is not so much a hit as a quick target detection. The Americans hit the missile with a guided projectile from a howitzer, and the railgun does not care about the consumption of projectiles - these are cheap blanks, the main thing is the lead calculation algorithm.
      1. grandfather_Kostya
        grandfather_Kostya 24 January 2022 10: 05
        0
        That's what we're talking about - rockets are different, some do not fly along a smooth predictable trajectory, but plan in zigzags.
      2. rocket757
        rocket757 24 January 2022 10: 16
        +1
        Quote: Torvlobnor IV
        Aiming an unguided projectile at a fast target flying by

        I clarify, on an unguided target .... pointing at a maneuvering target, it will be difficult, except perhaps at close range. And from which side will the target fly, the question is? How many such installations are needed to protect the coast, for example ??? What energy supply infrastructure, for example, should be built???
      3. sharp-lad
        sharp-lad 24 January 2022 22: 54
        0
        the railgun does not care about the consumption of shells - these are cheap blanks, the main thing is the lead calculation algorithm.
        That's just the capacitors and the rails themselves do not care at all.
  4. Kaufman
    Kaufman 24 January 2022 09: 32
    0
    In the process of study and development, a number of discoveries related and not related to weapons will be made. The Japanese are moving their science. In any case, it will be useful
    1. Cananecat
      Cananecat 24 January 2022 09: 41
      -2
      Quote: kaufman
      The Japanese, move their science

      No more than other countries.
      1. Kaufman
        Kaufman 24 January 2022 09: 46
        -2
        nothing more than Zimbabwe or Belarus?
        1. astepanov
          astepanov 24 January 2022 12: 21
          +3
          The cost of science in Russia is only 3% of the cost in the United States. The total cost of NATO countries is even greater. Spending on science in Russia is 1% of GDP, in the US - more than 3%. Whether someone likes it or not, this is a fact, and the longer it goes on, the stronger Russia's lag will be. Everything is one way or another imprisoned for the weakness of our economy. There is one consolation: poverty forces us to avoid deliberately failed projects, such as the same railguns, and focus on the "sure thing". But only professionals can determine what is "sure thing" and what is a dummy, and "effective managers" with journalism diplomas.
          1. Kaufman
            Kaufman 24 January 2022 14: 27
            -2
            So, and what do we have a "sure" of the latter, and what does not work?
            Hypersonic +
            Reconstruction and repair of Kuzi -
            Su-57 so far -
            Armata so far -
            something that does not apply to the military commissar - Skolkovo? What have they done in the last 5 years?
            1. tikhonov66
              tikhonov66 25 January 2022 12: 39
              -2
              "... Skolkovo? What have they done there over the past 5 years?
              ..."
              And google will help you...
              And "offhand" - a plate of OPTICALLY CLEAR diamond with a diameter of 70 mm.
              Vapor phase epitaxy on iridium substrate...
              - but that's the way it is...
              8-))
              Dvorkovich called a large number of start-ups of the innovation center a success of Skolkovo.

              “Today we have 2,5 thousand startups, and in total, much more passed through Skolkovo, about four thousand. This is 40-50% of all startups in the country. We have grown by two orders of magnitude. This topic is only becoming more fashionable, because it is essential Some of these startups are successful. About 500 of our companies have a profit, and more than 1000 startups have revenue. This is a very good result, which attracts new teams and new ideas. We are already creating a good foundation for the introduction of these developments on a national scale and abroad. markets," Dvorkovich said.
              https://macos.livejournal.com/1674690.html
              Thus, the Russian company Synesis recently entered the prestigious international rating of intelligent video analytics systems. Its cloud-based Smart City solution can be expanded to the scale of entire states and is already successfully operating in many countries around the world.

              Equipment developed by another company - "T8" has set 3 world records for data transfer speed and successfully competes with the solutions of the world leaders Huawei and Nokia.

              The face recognition system of the Skolkovo company VisionLabs recently entered the top three in the world. It is already being used in Russia and has allowed law enforcement agencies to detain more than 80 criminals.

              The Eidos-Medicine company, which creates robotic simulators for training medical staff, has already occupied 50% of the world market and supplies products to the USA, Japan, the European Union and, of course, to Russian medical institutions.

              The Exoathlet company has entered the top 5 manufacturers of medical exoskeletons, its products help people learn to walk again in dozens of Russian medical centers and even in South Korea.

              The Motorika company produces bionic prostheses for adults and children - they are also supplied not only to the CIS, but also to the UK and the USA.
              - etc.

              THE PEOPLE WORK.
              - and not moaning over the keyboard, sho-they say "the mustache is gone"
              8-))
              1. Kaufman
                Kaufman 25 January 2022 12: 47
                -1
                And when will we see? Haven't heard of any of the above. Huawei and Nokia compete .... Either on paper or in single copies
  5. Sharky
    Sharky 24 January 2022 09: 44
    +1
    But the bad experience of the American fleet does not establish Japan.

    Doesn't stop...
    The railgun is an interesting topic, but there can be no talk of mobility. You need a compact and powerful power source.
    1. tikhonov66
      tikhonov66 24 January 2022 14: 28
      +1
      "... We need a compact and powerful source of energy.
      ..."
      - they will take their Fukushima - and under PRESS it, under PRESS ...
      8-))
      1. Sharky
        Sharky 24 January 2022 15: 36
        0
        Fukushima - and under PRESS her, under PRESS ...

        So it is possible to compress it before a nuclear explosion. winked
        1. tikhonov66
          tikhonov66 25 January 2022 12: 40
          +1
          "... So you can compress it before a nuclear explosion.
          ..."
          - well - so WHAT YOU ORDERED!
          powerful and compact...
          8-)))
  6. tralflot1832
    tralflot1832 24 January 2022 10: 04
    +1
    The Japanese have taken it - it means they will do it in the next anime series.
  7. Basarev
    Basarev 24 January 2022 10: 10
    -4
    Here is the answer to the cartoons of the devil. And he thought that everyone around would be frightened and accept his quirks. And what is most characteristic, most likely, the Japanese will succeed, they have no problems with personnel, resources and technologies.
    1. tikhonov66
      tikhonov66 24 January 2022 14: 29
      0
      "... most likely, the Japanese will succeed, they have no problems with personnel, resources and technologies
      ..."
      - flick in their hand
      and a drum around your neck!
  8. mojohed2012
    mojohed2012 24 January 2022 10: 13
    +2
    Well, what kind of computers are needed, what mechanisms and transmission control such a railgun cannon to shoot down hypersonic missiles in advance!?!
    Utopia!
    They play and quit. The United States also tried to develop something similar - they abandoned it.
    It’s easier to develop hypersonic anti-missiles and systems for detecting someone else’s hypersound than to throw blanks dispersed by an electro-magnetic field into nowhere to receive target designation from some kind of computer or headquarters.
    1. tikhonov66
      tikhonov66 24 January 2022 14: 35
      0
      "... They will play and quit. The United States also tried to develop something similar - they abandoned it.
      ..."
      - NOT otherwise, as the Japanese military-industrial complex is inspired by the example of Haji NASreddin.
      He also contracted for the padishah - for a fair amount of money and ten years to teach his donkey to READ THE KORAN, agreeing that in case of failure, they would cut off his head.
      - Friends told Nasreddin - what are you doing?! This is certain death.
      Uh, said Nasreddin - they give me money right now, but in 10 years anything can happen ... Either I die, or padishah, but most likely - my donkey ...
      8-))
      1. mojohed2012
        mojohed2012 25 January 2022 09: 08
        0
        That's it: Japan will receive not a railgun with equipment for detecting-targeting-guiding-killing hypersonic missiles, but ears from donkey Nasredin.
        Increasingly, the Japanese authorities in the race for ratings go beyond the rhetoric about the Northern Territories, and they swung at counteracting hypersound. Elections. What to do...
  9. Graz
    Graz 24 January 2022 10: 14
    +3
    the railgun can only shoot a metal blank, for long distances it is stupid. if the shooting is not at a stationary target, in the anti-aircraft version too
  10. APASUS
    APASUS 24 January 2022 10: 20
    +2
    A shot from a railgun at a hypersonic target, that's what I understand there should be a mathematical model ............. seven zeros after the decimal point?
    1. tikhonov66
      tikhonov66 24 January 2022 14: 45
      +1
      "... A shot from a railgun at a hypersonic target, that's what I understand there should be a mathematical model ............. seven zeros after the decimal point
      ..."
      - here, alas - no model will help!
      Shells with each shot - DIFFERENT. The distribution of temperatures and air density over height, the strength and direction of the wind at different heights are different (they all change with time).
      - Therefore, the dispersion of artillery shells is a classic example of a RANDOM VALUE, the main difference of which from the usual "classical" value is that even a FULL study of ALL REASONS for the deviation of a given particular shot from the target - ABSOLUTELY DOES NOT ALLOW to predict the deviation from the target of each of the subsequent shots. Therefore, successive readings of such a magnitude (such as the deviation of the projectile from the target) are called INDEPENDENT. And the laws of their behavior are studied - by special STATISTICAL methods.
      - and this is the materiel ...
  11. rotmistr60
    rotmistr60 24 January 2022 10: 31
    +1
    Japan to begin development of a railgun
    I advise the Americans to consult on this matter.
  12. Amateur
    Amateur 24 January 2022 10: 43
    0
    The most important thing is to power the Japanese railgun from the Fukushima nuclear power plant. Then any counter-missile will independently shirk to the side, thereby straying off course.
  13. ximkim
    ximkim 24 January 2022 10: 49
    0
    Since the war is canceled, you can think about new types of weapons.
    They will succeed.
  14. sen
    sen 24 January 2022 10: 50
    +1
    Of course, the projectiles fired by the railgun cannot be controlled like rockets, but they can shoot quickly and continuously, and the shells themselves are small and cheap to manufacture.

    Nothing like this. "Another difficulty lies in the inability to provide a rate of fire at the level of conventional guns. The prototype used earlier could fire no more than three rounds per minute. For comparison, the rate of fire of the 127-mm Mark 45 naval gun mount is 20 rounds per minute."
    https://naked-science.ru/article/tech/relsotron-vms-ssha-sdelal-dva
    Perhaps, in my opinion, the use of, say, 20 "barrels" in one installation.
    1. tikhonov66
      tikhonov66 24 January 2022 15: 38
      +1
      "... Perhaps, in my opinion, the use of, say, 20 "barrels" in one installation.
      ..."
      - yes, at least 1000 trunks.
      The problem is not the number of barrels - but the POWER of the power source for this bandura.
      Let, for example, a projectile with a mass of 10 kilograms accelerate to a speed of 10 km/sec. The energy of such a projectile is em ve squared in half, where "Em" is 10kg, "ve-square" is 10.000 * 10.000 m/sec = 10exp8 m*m/sec*sec. The total energy of the projectile will be another 10 times (by the number of kilograms) - more - i.e. 10exp9 ru*m*m/sec*sec = 10exp8 joules. If you send such a projectile every second, then the power source must give off such energy every second. That. such a source should for a LONG TIME deliver a power of 10exp8 j/sec = 10exp8 watts. those. 100 megawatts. that's 136000 horsepower. Or 324 mining dump trucks BelAZ 7540. Or the power of all 8 turbines from TWO Boeing 747 liners ...
      - and note - all THIS at 100% efficiency of converting the energy of the engine / power source into the energy of a projectile / blank. And 100% is an unattainable ideal.
      The power efficiency of the turbine is usually 0,78 - 0,83 - let 0.8.
      The efficiency of the railgun itself is 25-30% (for DARPA) - let it be 30% (they will tighten up)
      Final efficiency - 0.8 * 0.3 = 0.24
      The total power of the "railgun" engine at a rate of 1 hypersonic blank per second = 136000 hp / 0.24 = 566.666 hp.
      - REGARDLESS OF THE NUMBER OF "trunks" ...
      8-))
      Yes! And take into account the need to remove "from all trunks" a thermal power of 100 megawatts * 0.3 (the efficiency of the railgun according to DAPRA materials) = 30 megawatts ...
      - How to do it - only God knows ... You mean the radiator of a car - so it dissipates a maximum of 100 kilowatts. 1000 of these radiators...
      Maybe - several industrial cooling towers with continuous evaporation of water ...
      And note - this also requires additional power!
  15. Hazarov
    Hazarov 24 January 2022 11: 13
    0
    Well, okay. the Americans drank the polard to the dollar, and now the Japs will give the amers a little more modestly 56 dollars to the dollar!
    And they also say that there is corruption in Russia! That ours are just goldfinches!
    Saw twice the same thing, but in different countries! This is skill! Cool Mavrodi!
  16. aszzz888
    aszzz888 24 January 2022 11: 25
    +1
    Japan is going to develop a railgun for missile defense
    It would be better if they dealt with Fukushima, again they have phonitis there specifically.
    1. Victor Dubovitsky
      Victor Dubovitsky 24 January 2022 14: 36
      0
      This is where double standards come into play. During the bombing of Hiroshima and Nagasaki, it was beneficial for the Japanese to add political motives to the existing losses. They paid the Americans pretty decently for this case, and the Americans funded the cleanup. It is the territory of Hiroshima in our time that is the cleanest place in Japan in terms of nuclear contamination. Fukushima is already an accident. in which the Japanese themselves are already to blame, and here it is beneficial for them to hide the extent of the disaster.
  17. Victor Dubovitsky
    Victor Dubovitsky 24 January 2022 11: 36
    +2
    Quote: rocket757

    Japan is going to develop a railgun for missile defense
    . Against missiles, that's cool!
    The main thing here is to accurately calculate the trajectory of the target ... this is, among other things.
    In general, the task is not trivial!

    Anything can be calculated. The main thing is not this. The main thing is the EXACT determination of coordinates, with a resolution of fractions of a meter, at distances of hundreds of kilometers. Especially when aiming at an object blurred from precise observation by a plasma cloud. A railgun blank is not the warhead of a projectile capable of hitting fragments at a decent distance. Here you need to get not to the AREA of finding the target, but to the target itself. The second difficulty is to precisely control the speed of the disc, and this is a completely impossible task. For the slightest lag or advance by shooting with an uncontrolled object will not allow you to achieve your goal.
    1. Disant
      Disant 24 January 2022 13: 11
      0
      Victor, the main difficulty today is in materials science.
      their gun melted when fired and the red-haired barrel spat.
      there are no materials.
  18. Humpty
    Humpty 24 January 2022 11: 39
    +1
    Probably weak to build an anti-aircraft gun from a tank gun. The muzzle velocity of the projectile is almost the same as what they want to achieve from a railgun.
    Let them saw the golden weight.
  19. Victor Dubovitsky
    Victor Dubovitsky 24 January 2022 14: 25
    0
    Quote: Disant
    Victor, the main difficulty today is in materials science.
    their gun melted when fired and the red-haired barrel spat.
    there are no materials.

    I don't know about "they". I read that both ours and the Americans fired this piece of iron. A copper blank that slid along two guide rails, along which a current pulse was launched. The interaction of magnetic fields .... Wear, of course, but it would be enough for several launches. Generally, I think. that these methods of shooting are not for shooting, but for deceiving the enemy. Make him run to dead ends, spending billions in the process. The very principle of projectile acceleration completely excludes the presence of a control system and a charge for detonation in it. Super-hyped sniper rifles give results in a couple of kilometers. No more. But for a dozen - and even a hundred ..... This is with a horizon range on a flat surface of the Earth of 20 kilometers. And then, in a straight line, not to the target, but to the Cosmos.
  20. neurostimulator
    neurostimulator 24 January 2022 15: 38
    -2
    Theoretically, firing shrapnel at a speed of several strokes could stop a hypersonic anti-ship missile on approach 1-2 seconds before hitting the target. The same on earth.
    In practice, there is a question of what will cost less than an extra couple of hypersonic anti-ship missiles or a destroyer with railguns lying at the bottom of the Sea of ​​​​Japan, or a destroyed missile defense line armed with the same railguns.
    1. agond
      agond 24 January 2022 19: 50
      +1
      North Korea has rich experience in the construction of underground structures and the example of Japan can encourage them to build a mine with a depth of about a kilometer, with an inclination of the shaft at an angle, for example 70 *, such an angle will allow the projectile to be thrown less slowed down by the air., the area where the projectiles fall on the ground will have a strongly shaped an elongated ellipse, the range can be changed by the acceleration speed, only Japan will probably be against such a development
      1. neurostimulator
        neurostimulator 24 January 2022 21: 08
        -2
        They were going to build missile defense systems, not "planetary" artillery ... although attacking first is the best defense. Or maybe they won’t do missile defense at all. I guess we'll have to wait and see.
    2. tikhonov66
      tikhonov66 25 January 2022 12: 47
      -1
      "... Theoretically, firing shrapnel at a speed of several strokes could stop hypersonic anti-ship missiles ..."
      - COULD NOT
      Compare the IMPULSE of a hypersonic blank or rocket - the filling does not matter - and one or two "shrapnelins".
      - Learn physics.
      1. neurostimulator
        neurostimulator 25 January 2022 12: 54
        -4
        I compared - everything that meets each other at a speed of Mach 2-3 on a collision course is mutually destroyed regardless of the vector of the resulting impulse of the entire system (shrapnel, warhead, fragments). It is possible that neither in nature nor in technology are there such materials that could survive such loads, ensuring the integrity of the structure of the product (both missiles as a whole and warheads separately). Not to mention the fact that serial models of equipment can be produced from them, even if such materials are available.
        What does your comparison look like?
  21. Ua3qhp
    Ua3qhp 24 January 2022 19: 42
    0
    which will fire projectiles at six times the speed of sound and also shoot down hypersonic missiles.

    2A46 has an initial BPS speed of approximately 1800 m / s, a rate of fire of 8 rounds per minute.
    Six speeds of sound is about 1960 m/s.
    So, what - T-72 on the hunt for hypersonic missiles wink
    In line for a cut of the budget, stand up!
  22. Reserve buildbat
    Reserve buildbat 25 January 2022 10: 06
    0
    Interestingly, the Yaps want to shoot down missiles flying at a speed of 8-10M with projectiles flying at a speed of 6M. Well good luck to them.