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[UG] Navy To Deploy Railgun In 2016 - Page 5

post #41 of 170
Quote:
Originally Posted by Phaedrus2129 View Post

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...

Ships are made of metals and composites.... would conduction would be an issue electrocuting seamen? (No way to insulate that much potential voltage).

Part of the Zumwalt's design was to mitigate damage and increase survivablity was to spread out their missile tubes along the outer edge of the hull. If they got hit, any explosion would be directed outward and would only affect that cluster leaving others still usable. Similar approach could be done for these massive caps.


Wouldn't they use a Marx generator rather than a Cockroft-Walton multiplier?
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post #42 of 170
Well one thing a bank of capacitors has going for it over a conventional magazine is that it isn't always charged - whereas explosives are always explosive (you know what I mean).

I would also imagine that should there be a need to quickly dissipate the charge they would be able to do so. If your magazine is on fire it is hard to jettison all the explosives quickly.
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post #43 of 170
Wouldn't the point of such a long range weapon be to hit the enemy long before they ever had the chance of hitting you in the first place?
post #44 of 170
Quote:
Originally Posted by Majin SSJ Eric View Post

Wouldn't the point of such a long range weapon be to hit the enemy long before they ever had the chance of hitting you in the first place?

But you can never count on them not hitting you.... sabotage, surprise attack by deception, surprise attack by stealth, small boats, missile barrages, aircraft, etc.
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post #45 of 170
Quote:
Originally Posted by DuckieHo View Post


Wouldn't they use a Marx generator rather than a Cockroft-Walton multiplier?

Marx generators are mainly for pulse stuff , the Walton multiple is for continues use and is probably used the charge the banks over a set time .
Edited by TwirlyWhirly555 - 4/8/14 at 10:53am
    
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post #46 of 170
Quote:
Originally Posted by DuckieHo View Post

Try powering that......

...and are there still global treaties on navy tonnage?
Actually, the alternative weapon is a directed laser (and that is still under development last I heard).

I'll raise your particle beam with micro black hole cannon or anti-matter shell!

I raise your particle beam and micro black hole or anti-matter shell with a:

Sun Crusher (http://starwars.wikia.com/wiki/Sun_Crusher)

Stellar Converter (http://uncyclopedia.wikia.com/wiki/Master_of_Orion_II)

Wormhole Weapon (http://farscape.wikia.com/wiki/Wormhole_weapon) Thanks John Cricthon!

..or any universe destroying weapon Dr. Who deals with weekly biggrin.gif
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post #47 of 170
Quote:
Originally Posted by DuckieHo View Post

Ships are made of metals and composites.... would conduction would be an issue electrocuting seamen? (No way to insulate that much potential voltage).

Part of the Zumwalt's design was to mitigate damage and increase survivablity was to spread out their missile tubes along the outer edge of the hull. If they got hit, any explosion would be directed outward and would only affect that cluster leaving others still usable. Similar approach could be done for these massive caps.


Wouldn't they use a Marx generator rather than a Cockroft-Walton multiplier?

Quote:
Originally Posted by GingerJohn View Post

Well one thing a bank of capacitors has going for it over a conventional magazine is that it isn't always charged - whereas explosives are always explosive (you know what I mean).

I would also imagine that should there be a need to quickly dissipate the charge they would be able to do so. If your magazine is on fire it is hard to jettison all the explosives quickly.

It isn't hard to insulate against low-kilovolts, it's when you hit 10kV or more that that would be a problem. But that voltage would be internal to the railgun mechanism, after the boost stage and CW multiplier. Not in the capacitor banks.

If all of the caps discharged into the superstructure of the ship, you could see what's essentially a "ground potential rise", only in this case it would be the ship instead of the ground. However I think most of the energy would dissipate into the sea, so any ground potential rise would be extremely brief. Still could be dangerous to personnel or equipment though. Beyond my area of expertise.


I think one basic safeguard would be to have the capacitors connected to a big failsafe ground, basically a solid copper rod going down into the water which is insulated from the rest of the ship. They could use an oil-cooled, high-voltage relay to short the capacitors to earth through that fat conductor rod. That way if a capacitor bank was damaged and in danger of exploding, all of the energy in the capacitor banks could be dumped at once without endangering the crew or ship. That way you might lose one capacitor bank, but not the whole railgun system.




Buuuuut, I don't know enough about their system architecture to do more than conjecture.

As for Marx vs. Cockroft-Walton, I'm not sure which would be better. I'm more familiar with CW, but Marx looks like it's probably more practical for a railgun. Would need to read more about it.
post #48 of 170
I wonder what the railgun will look like on radar. A large part of Zumwalt's design is stealth and a low radar signature which would make it hard for radar based weapons to pinpoint. However generating a large electromagnetic pulse when firing your main weapon would light up any radar picture making it vulnerable to anything like a HARM type missile designed to track active radar signals. I'm thinking along the lines of a small stealth drone type device that loiters above the battle until it detects a large radar signal, then dives...

The tactics would probably then be to fire a few rounds and move, more like infantry tactics that large naval tactics.
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post #49 of 170
Quote:
Originally Posted by GingerJohn View Post

I wonder what the railgun will look like on radar. A large part of Zumwalt's design is stealth and a low radar signature which would make it hard for radar based weapons to pinpoint. However generating a large electromagnetic pulse when firing your main weapon would light up any radar picture making it vulnerable to anything like a HARM type missile designed to track active radar signals. I'm thinking along the lines of a small stealth drone type device that loiters above the battle until it detects a large radar signal, then dives...

The tactics would probably then be to fire a few rounds and move, more like infantry tactics that large naval tactics.

Hmm... speaking of drones, imagine decades down the line when we have the ability to put smaller, practical rail gun on a drone. Portable anti-armor drones smile.gif That... or Metal Gear
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post #50 of 170
Quote:
Originally Posted by Syan48306 View Post

Yes, they were replaced by aircraft carriers and destroyers. However, if you've got a huge "nuclear" destroyer with many of these railguns it's no longer a destroyer sized ship....wouldn't that be more of a battleship than a destroyer? biggrin.gif

A railgun platform essentially a mobile a seige device that can hit targets of over 100 to 200 miles. That'll replace the need of many surface to surface missles. At $25,000 per shot instead of 1.5 million for the tomahawk cruise missile, it might make sense to consider this.

One aircraft carrier and battleship seige vessel per fleet with a few aegis missile defense ships? tongue.gif

Well if someone built a large railgun platform it would probably end up closer to an battle-cruiser then a battleship. The main difference between an battle-cruiser and a battleship is the design rather then just armament as battleship are built with very heavy armor while battle-cruiser are built more agile and fast.

So think more HMS HOOD



Or the more modern Kirov-class that's still in service (though technically some call it an large guided missile cruiser)




And less true battleship like the Iowa

    
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