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[Wired] Video: Navy Fires Off Its New Weaponized Railgun - Page 4

post #31 of 94
Quote:
Originally Posted by BinaryDemon View Post

Why is there recoil on the railgun? Is that just displaced air? Or some other effect like breaking the sound barrier in the barrel?

Well it is still accelerating the projectile, the reaction force from that has to go somewhere.
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post #32 of 94
I thought one of the prime benefits of a railgun was that the ballistics could not be picked up by most detection systems since there was no fuel or burn from the projectile itself. Maybe I'm wrong though.
post #33 of 94
I see NO pratcicality in real warfare for this thing. Why not just fire an artillery shell that actually explodes on impact? It's such a waste
post #34 of 94
Quote:
Originally Posted by RUDDER View Post

Your accelerating a mass in one direction, the reaction to that force has to go somewhere, you know, Newton's 3rd law and all.

Nope, not in this case.

321

The heat produced is causing the blast and air expansion.
Air expansion causes the recoil.
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post #35 of 94
Quote:
Originally Posted by Just a nickname View Post

Consistency: If you read the article, they have to cool it.

Yes, but you don't have to deal with any chemical variations in the propellant. Slight variations in humidity, age, chemical composition, density grain size etc can change the burn rate and therefore change the path of the projectile
Quote:
Originally Posted by Just a nickname View Post

Safer in the event of a fire: How is generator holding 12 megajoule of electicity safe? If one of these blow, I wish I am not close to it.

Generating and storing energy for the breif period before firing is a lot safer than carting round a lot of high explosive propellant all the time. If there is a fire aboard it would be easy to quickly dissipate the electricity, you can't just make a bunch of conventional ammunition dissapear.

If either this or a conventional main gun "blow" there isn't going to be much of you left to pick up anyway, so no change there.
Quote:
Originally Posted by Just a nickname View Post

Carry more rounds: Dude, look at the amount of energy you need to fire a single projectile. You need generator, capacitors, etc. This stuff is far from being portable.

No, it is meant to go on a ship, hence the Navy's interest in it. Nuclear powered ships already have some pretty beefy turbogenerators on board, wouldn't take much more space to upgrade and uprate them a bit (I used to deisgn Naval TGs and main turbines). The capacitors will take up space, granted, but I bet it won't take all that much space once it is "weaponized".

If they can reduce the size of the magazine then they can pack more other stuff in. Or they can keep the magazine the same size and pack more rounds in.
Quote:
Originally Posted by Just a nickname View Post

Less detectable: This canon is intended to be used for long range strike.

That was just a thought along the lines of you can jam radar, but it is difficult to disguise the huge IR spike from firing a ship's main gun.

Edit:
Quote:
Originally Posted by Just a nickname View Post

Nope, not in this case.
{snip}
The heat produced is causing the blast and air expansion.
Air expansion causes the recoil.

If you got that image from Wikipedia it is worth reading on a bit:
Quote:
The recoil force exerted on the rails is equal and opposite to the force propelling the projectile.

Just because you are using electromagnetic force to accellerate something does not change the fact that you need to have a reaction force. The reaction force will be exerted on the rails, which in turn are attached to the barrel.
Edited by GingerJohn - 2/29/12 at 9:40am
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post #36 of 94
With the right type of jacket and core around the ammunition, a kinetic round, such as this, is far better than an explosive round.

In the first Gulf war, with all the tank battles, we wanted as much range as possible so we could hit them before they could hit us....so the Abrahms tanks use sabotted rounds with no explosives at all....i belived it was a copper jacket and a core of tungsten or depleted uranium.

When the round hit the tank, i would punch a small hole, and the kinetic energy and massive friction caused by the impact would super-heat the core of the bullet filling the interior of the tank with extremely hot, etremely fast moving shrapnel.

Kinetic and explosive combinations are preferable to explosives in a situation where you have etremely hardened targets, such as mountain caves and underground bunkers. Kinetic to punch through the barriers, and explosives to jack everything up once its through.
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post #37 of 94
Quote:
Originally Posted by Joephis19 View Post

With the right type of jacket and core around the ammunition, a kinetic round, such as this, is far better than an explosive round.

That would also potentially fix the "muzzle flash". Apparently the fire we see in the video, is actually the aluminum slug burning up from air friction.
 
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post #38 of 94
Funny to see this up close. I was actually in King George County walking around in the middle of nowhere trying to find a house when I heard this thing. As demonstrated in the video it produces the crazy, otherworldly noise when it is fired. I had no idea what it was at the time but was later filled in by a local.
     
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post #39 of 94
YES! biggrin.gif
post #40 of 94
This makes me feel all warm and fuzzy inside. thumb.gif


And yes, i've been waiting for someone to mention the kinectic energy involved here.
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