this post was submitted on 24 Nov 2025
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At a time when control of Pacific sea lanes is contested, Japan is positioning its hypersonic electromagnetic railgun development as a strategic centerpiece, aiming to deter Chinese naval threats and shift the regional balance of power.

Tokyo’s latest demonstration, shown by state-run ATLA, displays a prototype railgun firing hypersonic rounds at a moving ship. As the projectile surged forward, the deck shuddered slightly under the silent electromagnetic pulse, while nearby crew members steadied themselves, their expressions a mix of awe and anticipation.

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[–] wizzor@sopuli.xyz 12 points 2 days ago (1 children)

For the curious, the key specs mentioned in the article:

  • Mach 6
  • Range in "miles"
  • 200 rounds per barrel
  • Cap banks take multiple sea containers worth of space

200 rounds per barrel takes the gun into practical territory. I bet Taiwan could use a fozen of them.

Interesting to hear what the true range ends up being.

[–] ulterno@programming.dev 2 points 1 day ago (1 children)

200 rounds per barrel

That's a pretty respectable life for a railgun. Dunno what the material cost is coming up to.
Now, how well can it intercept?

[–] wizzor@sopuli.xyz 3 points 1 day ago (1 children)

Would be really interesting to learn about how stable the ammunition is in flight. I don't imagine it would be easy to have any kind of active stabilization or guidance and the gun itself is probably quite heavy, so hitting drones is probably a no go, but hitting ships...

[–] ulterno@programming.dev 1 points 22 hours ago

Yeah, now that I think about it, Mach 6 is not quite fast enough to intercept anything and lasers are probably more suited than this, despite their range and energy problems.
Of course, it being a railgun, not really expecting any sort of guidance in it. It's probably just a projectile.
Had it been around Mach 9 (~ 3km/s), I would consider it useful with a remote-release flak or sensor-assisted release flak for interception, as even tiny pebbles would be expected to disrupt nuclear armaments at those speeds.

[–] magnetosphere@fedia.io 4 points 2 days ago (3 children)

Didn’t I recently read a post about the practical limitations of railguns, which concluded that lasers are better?

[–] wizzor@sopuli.xyz 3 points 1 day ago

For hitting drones and artillery shells? Almost certainly lasers win.

For hitting ships? Railguns, if the problems with the rails getting festroyed after a few shots can be fixed. The Japanese claim 200 shots per barrel. Whether that means just the rails or whole barrel is unclear.

[–] Icytrees@sh.itjust.works 5 points 2 days ago (1 children)
[–] Kolanaki@pawb.social 3 points 2 days ago

I can answer it but it has a 50% chance of being wrong.

[–] Manifish_Destiny@lemmy.world 4 points 2 days ago (1 children)

No, that was a dream we shared.

[–] magnetosphere@fedia.io 2 points 2 days ago

Okay, it all makes sense now