PRC/PLAN Laser and Rail Gun Development Thread

Discussion in 'Navy' started by SinoSoldier, Nov 17, 2015.

  1. Biscuits
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    Biscuits Junior Member
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    More money = more manufecturing lines, more dockyards making warships.

    There will always be new technology to explore, a higher budget won't stop them from doing that. It would help them transform prototypes and concepts into usable tools. The 002 being built now would apparently use IEP. These would be the largest IEP ships ever designed, lack of widespread IEP seems to be a prime example of budgetary constraints holding back the fleet's combat potential (through not by much, 055s have excess power due to large on board generators compared to similar ships)

    Railgun itself is a cost cutting measure compared to expensive arsenal ship concepts.
     
  2. Jura
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    Jura General

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    your second point inside
    #543 Biscuits, Yesterday at 9:24 PM
    "Last but not least, in a naval duel, the railgun can fire continuously and keep up pressure on an enemy destroyer, adding another supersonic projectile to the mixture of YJ-18s and 12s."

    kinda answers this:
    • at the mid range (100 or so km), I'm completely at loss while thinking about anti-shipping fire:
      the railgun fire would need to be corrected, I guess by observing the splashes, by
      a drone with an EOTS or something, flying over the horizon, but if you're still with me,
      you can tell me why they wouldn't just shoot an AShM instead and did a mid-course
      correction since supposedly there would the drone in place, communicating??
    #261 Jura, Feb 2, 2017

    as there could be a barrage by missiles and by projectiles, then

    anyway a railgun would do high-angle shots at a long distance:
    [​IMG]
    so? as for anti-shipping fire at 100 km (LOL if there were such thing),
    an approximation would be an equilateral triangle with the side of 100 km, and a projectile traveling it with M5 speed on average,
    meaning its time of flight would be almost two minutes;
    if the target ship sprinted at 30 knots, in the meantime she'd move by about one mile, so I think an IR seeker would be needed in the shell

    (an alternative would salvo firing LOL and corrections by a ballistic computer based on the splashes around zigzagging target as 100+ years ago)

    in the process found charts of the ballistic curve I've reconstructed
    (from https://www.scribd.com/doc/12981269/1944-US-Navy-WWII-16-Inch-Gun-Range-Tables-72p)
    years ago, hope nobody minds I'll preserve them here:
    [​IMG]
    [​IMG]

    would be cool to see the profile for a railgun huh
     
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  3. Jura
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    Jura General

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    for what you envisioned in
    #549 Biscuits, Today at 8:39 AM
    (firing at 300 km), please state
    1. the railgun's power (a number in MJ), and
    2. its projectile weight (a number in kg)
     
  4. Bhurki
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    Bhurki Junior Member
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    A projectile of 10 kg fired at Mach 7 yields railgun's power of about 27 MJ.
    The energy bleed at about 300 km would be too much, so the effective range would much likely be under 200 km. At range of about 200 km however, projectile will be able to retain around 15% of its muzzle energy. ( cross sectional areas in x & y taken as 0.02m² and 0.1m², drag (ballistic) coefficient taken from a standard artillery shell)
     
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  5. Jura
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    Jura General

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    all I found would be this (of presumably 64 MJ, of course nonexistent):
    [​IMG]
    [​IMG]
     
  6. Anlsvrthng
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    Anlsvrthng Senior Member
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    A projectile on that height gives away the position of the ship to half of a continent .
    Every S band radar in 1000 km will see the projectile, and can calculate the approximate position of the gun.
    The projectile is metal, and the size / features are close to S/X band radar wavelength.
    http://members.home.nl/7seas/radcalc.htm

    It worth to compare the detect ability of it with the P-800:

    It ejected to few 100 m , turn horizontal, and ignite the booster.
     
    #556 Anlsvrthng, Jan 16, 2019
    Last edited: Jan 16, 2019
  7. Nutrient
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    Nutrient Junior Member
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    Also, in any war against the US, China would have the advantage of defense. (In a Taiwan independence scenario, the mainland would be striking the small island, but when the US responded, the mainland would be defending.)

    Defense is cheaper; China can do fine with just a fraction of the US's military budget.

    The US invasion of Iraq cost $2 to $3 trillion. Now imagine how much an attack on China would cost. I doubt China needs to spend a lot in order to make a US attack extremely expensive for the US.
     
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  8. Bhurki
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    Bhurki Junior Member
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    The parabola that you posted gives trajectory of a projectile with initial velocity of 2000m/s at a 60° angle to horizontal
    (Based on chart range =350km, max alt=160km) if power given is 64 MJ, weight of fired shell will be 32 kg.
    The numbers that are achievable as of yet ( public knowledge) are about 25 MJ(Blitzer)
    See post #554
    Anyways, i think we should stick to posts about PRC railgun development rather than general discussions about the tech.
     
    #558 Bhurki, Jan 16, 2019
    Last edited: Jan 16, 2019
  9. Jura
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    Jura General

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    inside the CNN story
    New year, new weapons: Are China's latest science fiction or battle ready? https://us.cnn.com/2019/01/19/asia/china-new-weapons-2019-intl/index.html
    :

    Naval rail gun
    funny how their "analyst" is coy about the status of the US stuff Aug 30, 2018
     
  10. Jura
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    Jura General

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    Feb 2, 2017
     
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