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RAIL GUN

Rulerzigzag

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POSTS: 285

Report this Feb. 04 2006, 11:06 am

Im very fascinated by the Rail Gun. I think we should see one built in my lifetime, im 28 years old, and I hope I get that chance. What the rail gun does is use an electromagnetic field to propel probes, satellites or maybe even manned spacecraft.

Vol_

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POSTS: 6929

Report this Feb. 04 2006, 1:27 pm

Y'know , they had something similar in an episode of SeaQuest 2032 . A supersonic train that was in a tube underwater , but there was a vacuum inside it . They used some kind of superconducting electro magnetisam to propell the train . Why is it that in every sci fi show the lifts are all called , or have something related to Maglev conductors ?

Tannagra

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POSTS: 15354

Report this Feb. 04 2006, 2:46 pm

Quote (Rulerzigzag @ Feb. 04 2006, 8:06 am)
Im very fascinated by the Rail Gun. I think we should see one built in my lifetime, im 28 years old, and I hope I get that chance. What the rail gun does is use an electromagnetic field to propel probes, satellites or maybe even manned spacecraft.

I was reading some Arthur C Clarke recently and he uses rail-gun launchers abit in his stories.

In one story, a rail a few kilometers long propels a cargo shuttle from the moons surface at almost 5000miles an hour, moon escape velocity, in a few seconds!

AquamonkeyEG

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POSTS: 4915

Report this Feb. 04 2006, 4:22 pm

there are designs in the works by the Navy for their new line of electric powered cruisers to use rail guns as their primary guns. basically since the props are powered by electricity, it can be diverted to rail guns that fire ballistic projectiles into near orbit and hit with enough kinetic energy to take out pretty much anything. has very good range too.

Tannagra

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POSTS: 15354

Report this Feb. 04 2006, 4:27 pm

Quote (AquamonkeyEG @ Feb. 04 2006, 1:22 pm)
there are designs in the works by the Navy for their new line of electric powered cruisers to use rail guns as their primary guns. basically since the props are powered by electricity, it can be diverted to rail guns that fire ballistic projectiles into near orbit and hit with enough kinetic energy to take out pretty much anything. has very good range too.

Im also guessing as its electrically powered there's no recoil on the guns??

This could herald in a totally new design philiosphy when designing ships guns and maybe guns in general if the design could be scaled down in size.

AquamonkeyEG

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POSTS: 4915

Report this Feb. 04 2006, 5:06 pm

Quote (Tannagra @ Feb. 04 2006, 4:27 pm)
Quote (AquamonkeyEG @ Feb. 04 2006, 1:22 pm)
there are designs in the works by the Navy for their new line of electric powered cruisers to use rail guns as their primary guns. basically since the props are powered by electricity, it can be diverted to rail guns that fire ballistic projectiles into near orbit and hit with enough kinetic energy to take out pretty much anything. has very good range too.

Im also guessing as its electrically powered there's no recoil on the guns??

This could herald in a totally new design philiosphy when designing ships guns and maybe guns in general if the design could be scaled down in size.

there is a small amount of recoil which depends on the size of the projectile and the amount of magnetic flux in the casing.

Rulerzigzag

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POSTS: 285

Report this Feb. 04 2006, 7:22 pm

I dont know if I would call it recoil, the hardest thing is finding the raw material and coming up with the engineering to prevent the 2 rails from separation and building a base strong enough to harness the magnetic force. The HARP gun, used to shoot 250 kg objects at 3 times the speed of a sniper rifle's bullet withstanding 13, 000 g's.

Rulerzigzag

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POSTS: 285

Report this Feb. 04 2006, 7:27 pm

The Harp gun was old technology...the New Rail Gun being researched uses 2 parallel rails. The research going on right now is focusing on keeping the 2 rails from separating during launches. If built, this can propel objects at speeds reaching 3.5 Km a second.

AquamonkeyEG

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POSTS: 4915

Report this Feb. 05 2006, 12:41 am

Quote (Rulerzigzag @ Feb. 04 2006, 7:22 pm)
I dont know if I would call it recoil, the hardest thing is finding the raw material and coming up with the engineering to prevent the 2 rails from separation and building a base strong enough to harness the magnetic force. The HARP gun, used to shoot 250 kg objects at 3 times the speed of a sniper rifle's bullet withstanding 13, 000 g's.

how could you not call it recoil? what is recoil in the first place? it's just a reaction to the propulsive force emparted on the projectile. well if the projectile casing is magnetic and hit it with a strong EM field, the projectile is going to push back. of course this recoil is nothing like the recoil in the large caliber guns on ships today but it is still recoil.

Rulerzigzag

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POSTS: 285

Report this Feb. 05 2006, 12:56 am

your right.. its recoil.  Im reading the specs here of this new one. They are trying to get it built shortly after 2030, for probes and manned flight as well.

lanceromega

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POSTS: 3859

Report this Feb. 06 2006, 2:24 pm

Quote (AquamonkeyEG @ Feb. 03 2006, 3:06 pm)
Quote (Tannagra @ Feb. 04 2006, 4:27 pm)
Quote (AquamonkeyEG @ Feb. 04 2006, 1:22 pm)
there are designs in the works by the Navy for their new line of electric powered cruisers to use rail guns as their primary guns. basically since the props are powered by electricity, it can be diverted to rail guns that fire ballistic projectiles into near orbit and hit with enough kinetic energy to take out pretty much anything. has very good range too.

Im also guessing as its electrically powered there's no recoil on the guns??

This could herald in a totally new design philiosphy when designing ships guns and maybe guns in general if the design could be scaled down in size.

there is a small amount of recoil which depends on the size of the projectile and the amount of magnetic flux in the casing.

Actually there is a large recoil. The recoil is dependant on the force generated.

For launching a satellite in orbit we are talking about generating 1000's of g of acceleration. This alone make it unusable to launch poeple into space.

The Recoil can be lessen by extending the time the object is accelerated, which is done by lengthing the rail.

The only devices that generate low recoils are launchers that fire rockets, such as recoiless rifles. Since the opposing force to the forces of acceleration is carried by the rocket exhaust none is applied to the launcher.

lanceromega

GROUP: Members

POSTS: 3859

Report this Feb. 06 2006, 2:28 pm

Quote (AquamonkeyEG @ Feb. 03 2006, 10:41 pm)
Quote (Rulerzigzag @ Feb. 04 2006, 7:22 pm)
I dont know if I would call it recoil, the hardest thing is finding the raw material and coming up with the engineering to prevent the 2 rails from separation and building a base strong enough to harness the magnetic force. The HARP gun, used to shoot 250 kg objects at 3 times the speed of a sniper rifle's bullet withstanding 13, 000 g's.

how could you not call it recoil? what is recoil in the first place? it's just a reaction to the propulsive force emparted on the projectile. well if the projectile casing is magnetic and hit it with a strong EM field, the projectile is going to push back. of course this recoil is nothing like the recoil in the large caliber guns on ships today but it is still recoil.

Recoil is bout the same as a gun firing the same size projectile with same amount of force. it a basic law of physics. Battle ship guns fire projectiles the size of small cars while Rail guns fire projectile weighting only several kilograms, but at hypersonic velocities and unlike a normal cannon where all the force is applied at the moment of firing, the acceleration is spread out over the lenght of the barrel.

As it stand Rail guns have been suggest as a way to move small asteriods. Land a robotic probe on a asteriod, and use slugs of rocks from the asteriod as reaction mass, while using solar panel or a small nuclear reactor to power the rail gun. And it eventually alter the course of the Asteriod..

AquamonkeyEG

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POSTS: 4915

Report this Feb. 06 2006, 5:20 pm

yeah i didn't think too hard about it. i was just thinking about it on a small scale... equal and opposite reaction, since it is impulse the impulse recoil on the rig will be the same as the propulsive impulse on the projectile. or maybe i was thinking of it in terms of forces and relative mass. projectile is smaller than rig so accelerates a great deal more under the impulse than the rig. rig is going to be big so recoil distance and strain on rig structure will be less.

lanceromega

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POSTS: 3859

Report this Feb. 07 2006, 11:34 am

Quote (AquamonkeyEG @ Feb. 05 2006, 3:20 pm)
yeah i didn't think too hard about it. i was just thinking about it on a small scale... equal and opposite reaction, since it is impulse the impulse recoil on the rig will be the same as the propulsive impulse on the projectile. or maybe i was thinking of it in terms of forces and relative mass. projectile is smaller than rig so accelerates a great deal more under the impulse than the rig. rig is going to be big so recoil distance and strain on rig structure will be less.

Recoil on rail gun is still quite large actually greater than a standard naval 5" gun..

Tannagra

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POSTS: 15354

Report this Feb. 07 2006, 11:36 am

Clarke is always mentioning using a capsule 'bath like' full of water where the person is immersed. He says this would negate the high 'g' effects.

What do you guys think??

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