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[UG] Navy To Deploy Railgun In 2016 - Page 9

post #81 of 170
Quote:
Originally Posted by Vagrant Storm View Post

It would be a bit different when it was a rail gun vrs a missile that you could defend against...or worse...both coming in at the same time. A surface vessel carrying these would be sitting ducks to a return attack because any modern military force would pick it up in a heart beat I think...once they know to be watching for them. Subs are hard to pick up even with satellites.

Yeah, it would be different, I was just saying that subs are already pretty darn scary in that respect. A railgun type projectile would be even worse than a missile - much faster moving and almost impossible to intercept...

Depending on how fast the surface - fire - submerge sequence could be it would be very hard to defend against from the surface. Unfortunately surfacing a sub makes it easy to locate on sonar (hull popping noises, air / water sounds as the ballast tanks are vented and flooded). This would make it easy for a hunter sub to locate and destroy the railgun sub after the first few shots, assuming it was in the general area. Pretty much the same issue with missile launches from subs.

Subs are built to be almost impossible to detect. I've been "aboard" that Astute when it was under construction, the lengths they go to to ensure minimum noise are insane.
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post #82 of 170
why do we need a rail gun at all when we have HAARP?
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post #83 of 170
Drag your projectile into space and let gravity do the work wink.gif

http://en.wikipedia.org/wiki/Kinetic_bombardment
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post #84 of 170
Quote:
Originally Posted by Phaedrus2129 View Post


Ever seen a 2200uF, 50V capacitor explode? Or shorted the terminals of a 450V, 560uF capacitor? It's impressive. And that's peanuts next to the storage needs of a railgun. When the railgun is charged, you don't want to be near the capacitors if they get hit...

 

Might have a slight bit of language, but I think the point is worth it.

 

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post #85 of 170
Quote:
Originally Posted by Pwnography View Post

Drag your projectile into space and let gravity do the work wink.gif

http://en.wikipedia.org/wiki/Kinetic_bombardment


http://en.wikipedia.org/wiki/Project_Babylon

Fascinating read about Project Babylon, Saddam Hussein's attempt to build a Space Gun, ostensibly to fire projectiles into orbit.

The engineer behind the project, the Canadian Gerald Bull, was assassinated in 1990, before the project's completion, allegedly by the Mossad.
post #86 of 170
In general, when the US military says they will come out with something....they came out with it 20 years ago. wink.gif (sometimes its 30)
    
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post #87 of 170
Quote:
Originally Posted by ryanrenolds08 View Post

In general, when the US military says they will come out with something....they came out with it 20 years ago. wink.gif (sometimes its 30)

Well its no no secret that the US has been building railguns since the 80's and if they had some that worked they would be in the field by now. Its not a spy plain after all rolleyes.gif
    
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post #88 of 170
Quote:
Originally Posted by Vagrant Storm View Post

Didn't they mean that there is no explosion in the gun? In current guns, they are still packing charges largely the same way they were back when breach loading artillery was invented; which isn't all that much different than muzzle loading. I would assume the shell would still explode. Shrapnel is a good thing when talking about naval shells. Some might be solid armor piercing kinetic rounds though...but there would have to be explosive rounds too.

Nope, no explosives in a railgun slug.

You don't need any form of explosives to decimate a target then a super dense solid slug traveling mach 7(approximately 5,400 mph) hits its target. Ever seen the Mythbusters episode where they literally turn a car into dust with a 1" thick steel metal plate traveling 700 mph? This would be many magnitudes more destructive.

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post #89 of 170
Quote:
Originally Posted by Ashuiegi View Post

well it s very very unefficient , so much power lost in trying to spread the rail apart and heat , you can easily reach about mach 3-4 with pressure and vacuum , which is way more efficient .
the bank of blue thing behind are capacitor/battery , it s about 10x more capacitor/battery then they use in the LHC kicker magnet which has a current of 72 kA , yes 72000 amps in a non-supra magnet, but it's long to load even with access to mainland 380000V line so imagine on a ship lol

looking at some of the answers on here has me bewildered - i did not realize how many boffins belong to this site and i mean that in nice way thumb.gif

another boffin below me thumb.gif
Edited by ladcrooks - 4/9/14 at 1:17am
post #90 of 170
Quote:
Originally Posted by Phaedrus2129 View Post
 
Quote:
Originally Posted by DuckieHo View Post

Hmmmm.... could they mitigate by dropping a cable into the ocean as a sink?

I'm talking about a failure mode in which the energy stored in a capacitor or battery is released outside the normal circuit. For instance, if a bank of 2kV 1F capacitors feeding their Cockroft-Walton multiplier gets hit by shrapnel, you could see megajoules of energy being released as heat and concussion. It would be like a bomb going off.

That time I shorted a 450V 560uF capacitor was impressive. It was charged to just around 50 joules, and when that energy was dissipated as heat in a fraction of a second it gave a flash like a camera flash, with a bang like a handgun, and scorched the circuit board it was in. Imagine that multiplied by five or six orders of magnitude.



I hope they have their energy storage behind armor plate...

 

Last time I shorted a capacitor like that it was charged at 360uF 330V, I was jerking around with a cap ready to be plugged into a coil I just wound for my first coil gun. Let's say that due to a twist of fate what ended up shorting it was my index finger. I still remember that sting followed by a hardcore scorching pain. It stayed there for a week, and during the following week I could still feel the sting on what were the remainders of where once skin was.

   
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