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Battleships are back? What? How do I even meme this? How is this not already a meme? Why is the usa like this? Do they know why battleships stopped being effective as line combatants? (mander.xyz)
submitted 10 months ago by to c/noncredibledefense@piefed.social
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I caught the orange man talking on the radio, as I am not american I knew it was going to be something stupid but this? I thought it was a joke, an onion like thing, but nooooo. What sealed it is when in the very speech about the new 100x battleships, trump stated that he did not know why the us stopped using battleships....

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[–] 13 points 10 months ago (14 children)

if you fling a thing slow enough for a over the horizon shot

That doesn't make any sense and is not how physics works.

can only shoot real close or real far away.

No!

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  • [–] [S] 8 points 10 months ago (9 children)

    The world is, and I know this might be a shocker, round.

    Railguns when tested have an odd issue in that they shoot things real fast, and therefor a much flatter ballistic trajectory. Now this is good! if the curve of the earth did not put a fuck load of water between the railgun and the target. In fact due to physics (you know that thing that we are both clearly experts in) you end up with a big old dead spot in your range tables (more so with high sea states) where the railgun's dart will hit the waves on route to the target and although moving wicked fast the uncaring ocean will still stop or really change the darts course. This changes when you range out far enough that the ballistic trajectory curves enough but at those ranges accurate guidance is another issue (this was found out in 2019).

    So yeah according to physics shooting a thing at over 8000 km/h out of a tube means a flatter then needed trajectory for mid range (in ship to ship context) and when you get out to the full range you are talking 180 km or so, and at that point even the super fast darts are avoidable/hard to get on target.

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  • [–] 11 points 10 months ago* (last edited 10 months ago) (8 children)

    This is nonsense, and the source you linked does not support or even mention anything about what you've claimed about trajectories. Did you just hope no one would actually read it? It does, however, talk about the sustainability problems with maintaining the railgun as well as the benefit of simply using the projetile developed for the railgun in conventional guns. From your source:

    As the Navy was developing EMRG, it realized that the guided projectile being developed for EMRG, which weighs about 23 pounds, could also be fired from 5-inch and 155mm powder guns. When fired from EMRG, the projectile reaches hypervelocity (i.e., Mach 5+) speeds, and thus came to be known as the hypervelocity projectile (HVP). When fired from a power gun, the projectile flies quickly, but not as quickly as it does when fired from EMRG.

    “We thought rail guns were something we were really going to go after, but it turns out that powder guns firing the same hypervelocity projectiles gets you almost as much as you would get out of the electromagnetic rail gun, but it’s something we can do much faster,” [then-Deputy Secretary of Defense Robert] Work said.

    The trajectory of any projectile, including the shot of a railgun, follows an elliptic ballistic curve.

    There's no such thing as a dead spot in the range. You just aim up.

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  • [–] [S] 2 points 10 months ago (7 children)

    Yes, for longer range shots. For the middle of your range, you can't "aim up" that would not hit the target at the speeds needed. Lobbing rounds with a railgun is mostly worthless and can be done, as you have said, with a normal naval gun. So take your diagram (that has the labels wrong) and compare to an old one, from when battleships where still in use. See you are assuming that all ballistic curves are the same but the old 16 inch guns (for example) shot at 762 m/s vs the railgun that shoots at 2,220 m/s so the railgun will be more "flat" then the naval gun. Still a curve yes, but one that is now awkward when at sea. From what I was seeing this issue can be mitigated by moving the gun higher on the ship (its not by much the dart clips the waves) but that introduces new issues. The distance before something is "lost" over the horizon at sea is between 5 and 10 km (based on the height of the ship), at this range the railgun is still mostly going "straight" (its not but the drop is not enough yet). So if you want to hit something say 12 km away (in range of normal naval guns fyi) you would need to shoot so high that you would be putting the dart into a sub orbital trajectory and without guidance be lucky to hit anything (and good luck making a system that can withstand air at sea level when traveling at mach 6).

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  • [–] 4 points 10 months ago* (6 children)

    would not hit the target at the speeds needed

    As a projectile falls, it is accelerated by the force of gravity and gains speed.

    you would need to shoot so high that you would be putting the dart into a sub orbital trajectory and without guidance be lucky to hit anything

    The projectile fired by the railgun is GPS guided. What you're describing is literally the exact situation it is designed for. It is intended to leave Earth's atmosphere.

    The GPS-guided projectile will exit the launcher at approximately 2500 meters/second. On the way to its target, the projectile would leave the Earth's atmosphere, making it less susceptible to jamming or interception, and minimizing interference with friendly aircraft upon re-entry into airspace.

    https://www.globalsecurity.org/military/systems/ship/systems/emrg.htm

    You're simply incorrect about how any of this works.

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  • [–] [S] 2 points 10 months ago (5 children)

    Yes in a vacuum. Good thing the sea is famous for the lack of atmosphere. Not like the projectile exiting and re entering the atmosphere will have any effect on it after all.

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  • [–] 3 points 10 months ago (4 children)

    Please see the source in my comment above that I have included.

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  • [–] [S] 3 points 10 months ago (3 children)

    That link is literally an older report and is a section of the report I linked before. That is the theory from before they tested and found they could not meaningfully guide the dart once in flight and they would need the dart itself to be more steerable (they are not as of unclassified data now). They also have (in the later report) listed missile interception as being a potential future use case that currently they don't have the accuracy for. The issue remains that shooting a projectile into space to hit something not very far away is less then ideal and the project was killed in 2021, only to be brought back now.

    From another page on the railgun project: Like the Medieval search for the Holy Grail, the USN's search for a "Super Weapon" ultimately proved to be unsuccessful. In July 2021, the USN cancelled the Railgun development program, citing unresolved problems with barrel life and a low rate of fire. The Navy had spent about $500 million to develop the weapon. Future R&D funding will now go to other weapon systems such as anti-missile lasers.

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  • [–] 4 points 10 months ago* (last edited 10 months ago) (2 children)

    That is the theory from before they tested and found they could not meaningfully guide the dart once in flight and they would need the dart itself to be more steerable

    This is false and not mentioned by your source.

    citing unresolved problems with barrel life and a low rate of fire

    Lol.

    You were wrong about something. It's really not a big deal. It's worse to make stuff up to try to seem right and post "sources" that don't even mention what you're talking about.

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  • [–] [S] 1 point 10 months ago (1 child)

    Its right in the first document I linked That is still outdated from 2019. But no please lets keep going about how I am wrong due to you posting a promotional article from the people who are selling the system that does not address anything I stated. Or you can just say the word physics again, that would I am sure help us come to an understanding.

    We do both agree that the railgun system was scrapped for good reason, just not the same reasons.

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  • [–] 4 points 10 months ago* (last edited 10 months ago)

    Its right in the first document I linked.

    No, it isn't. If it was, then you could simply quote the relevant text and prove you are right. I'll wait.

    posting a promotional article from the people who are selling the system

    Again, completely false:

    GlobalSecurity.org is NOT a private security/military company, defense contractor, or vendor. We are NOT affiliated with any such entity and we do NOT sell anything. We also do NOT buy any military equipment, machine parts, or other such items. Our website has pages describing weapon systems and other equipment but we do NOT buy or sell them.

    https://www.globalsecurity.org/org/index.html

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  • [–] 4 points 10 months ago (3 children)

    It can actually (theoretically) shoot real far away.
    As in, when the target area is far enough that the projectile would have slowed down due to drag, long ago and start dropping more than it is going forward.
    The problem here, would lie in the stabilisation of the bullet and making sure it actually hits the target instead of a few km away, because faster bullets apparently have a greater difficulty staying on track.

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  • [–] 4 points 10 months ago (2 children)

    The projectiles fired by the railgun leave the atmosphere and are GPS guided.

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  • [–] [S] 2 points 10 months ago (1 child)

    Yeah, did you look into what "GPS guided" means here? Its not what you think.

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  • [–] 0 points 10 months ago

    I think they are trying to crack a joke.

    Considering that the escape velocity on Earth's surface is ~11200m/s and railgun speeds tend to be around 5000m/s^[at least in Wikipedia, all stated values are < 5km/s] (i.e. less than half) and also that the escape velocity would be considering a normal direction whereas railgun usage tends to be more tangential (from the surface of the Earth), I wouldn't be expecting any casual leave-the-atmosphere scenarios.

    As far as guided systems go, last I checked there wasn't enough leeway to add any electronic or mechanical elements in the projectiles.

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