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Topic: Rail gun

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	Railgun - Wikipedia, the free encyclopedia
		It is not to be confused with a coilgun (Gauss gun).
		The simple reason is that the destructive power of a handgun or long gun is limited as much by recoil as anything else; it is quite possible to build a handgun that fires 20 mm cannon shells, but the recoil would make it impossible to aim or fire safely.
		Rail guns have been proposed for use in delivering projectiles to space, especially from bodies without atmospheres (such as the Moon).
	en.wikipedia.org /wiki/Rail_gun (2347 words)

	NOT YOUR GRANDPA'S SHOOTIN' IRON: Rail Guns
		Rail gun projectiles are smaller and easier to store: a standard AGS magazine holds 1,500 rounds; a rail gun magazine could hold 10,000 rounds in the same amount of space.
		Despite numerous advancements over the last millennium, all guns, from the blunderbuss to the M-16, have operated on the "expanding gas" principle, where an expanding ball of superheated gas is used to force a projectile through a tube.
		This process, known as metal vapor arcing (MVA), eliminates physical contact between the rails while simultaneously closing the circuit (the metal plasma is conductive.) One of the drawbacks to MVA is the buildup of metallic residue on the rails, which is formed when the metal vapor cools inside the barrel.
	www.military.com /soldiertech/0,14632,Soldiertech_RailGuns,,00.html (1603 words)

	Rail guns - Patent 5060552
		A rail gun as claimed in claim 2 wherein each of said grooves is provided with a leading flank and a trailing flank with respect to the operational passage of an armature through said rail gun, the outlets of said nozzles being located in the leading flanks of said grooves.
		A rail gun as claimed in claim 2 wherein each of said nozzles is so aligned as to direct said cooling fluid on to the edge defined by the trailing edge flank adjacent thereto and the confronting surface of its associated rail electrode.
		In practice the space 14 between the rail electrodes 11 and 12 is flushed with helium from the nozzles 24 prior to the operation of the rail gun 10.
	www.freepatentsonline.com /5060552.html (1632 words)

	PowerLabs Rail Gun!
		In 2004 the gun, currently located at the Michigan Technological University Dynamics research laboratory, has been decommissioned and is currently being replaced by a new, vastly improved design; The Rail Gun 2.0...
		Good part of the many amateur Rail Gun attempts seen on the Internet failed because their power supplies were simply incapable of supplying the currents required; even "small" military and research designs employ currents in the 300KA+ range, with some of the larger guns going over 5 million amperes per pulse.
		This particular gun took 150 hours of design and construction work before it could finally be fired and although specific plans are not available at the time, a complete and detailed log of the construction effort, including pictures and videos, is available for free at the Rail Gun Construction Effort page.
	www.powerlabs.org /railgun.htm (3497 words)

	Physics 210 Railgun Project (Site not responding. Last check: 2007-10-30)
		Definition: a linear electromagnetic accelerator consisting of two rails and an armature in which the large amounts of current are passed through the rails to accelerate the armature by a Lorenz force.
		Because rail guns do not require a long duration of power, we decided the charged capacitor approach would be advantageous.
		As you see the groove is flat, and we fired the gun using either a small graphite disk or brass nut which we slid into the groove.
	www.princeton.edu /~pnelson/railgun (1134 words)

	Projectile for electric rail guns - Patent 4930395
		A projectile intended to be fired from an electric rail gun having spaced current-carrying rails between which the projectile is accelerated when fired, includes an armature mounted on the projectile and arranged to make contact simultaneously with the rails to electrically connect the rails to one another.
		This invention relates to a projectile for electric rail guns and is of the type which has at its tail end an armature which serves as a current bridge between the current carrying rails of the gun.
		Viewed along the length of the rail gun, the helical grooves 35, 35' are provided in the insulating rails 23 and 24 as well as in the current carrying rails 21 and 22.
	www.freepatentsonline.com /4930395.html (1369 words)

	Iraq Survey Group Final Report
		Rail gun equipment and materials uncovered by ISG similarly do not appear to have been part of a nuclear weapons design and development effort, even though a few items—with further development—had the potential of supporting such work.
		A scientist associated with the rail gun project claims the rail gun project was classified not because of the sensitivity of its application or technology—which appears to have been drawn from open literature—but to create an aura of importance.
		Information from a senior official in the rail gun program indicates this unit was limited in its ability to gather material property data—the kind of data of interest in a renewed nuclear weapons effort—because of the lack of diagnostic equipment (see Figures 30 and 31).
	www.globalsecurity.org /wmd/library/report/2004/isg-final-report/isg-final-report_vol2_nuclear-14.htm (3086 words)

	Jengel and Fatro's Rail Gun Page: Introduction
		A rail gun in it's simplest form is a pair of conducting rails separated by a distance L and with one rail connected to the positive and one the negative side of a power source supplying voltage V and current I. A conducting projectile bridges the gap L between the rails, completing the electrical circuit.
		As current I flows through the rails, a magnetic field B is generated with an orientation dictated by the right hand rule and with a magnitude governed by equation 1.
		The speed of a rail gun slug is determined by several factors; the applied force, the amount of time that force is applied, and friction.
	home.insightbb.com /~jmengel4/rail/rail-intro.html (857 words)

	Trenches on the Web - Photo Archive: Big Guns of the Great War
		It is interesting to note that several of the large siege guns used against the Belgian fortifications had to be set in concrete before they could be fired due to their massive recoil.
		The gun could be moved relatively quickly along the rail system and the recoil could be dispersed by allowing the carriage to hurtle down the tracks (sometimes up to 100 feet).
		The culmination of the rail gun was the massive French Schneider 520mm howitzer.
	www.worldwar1.com /pharc005.htm (1175 words)

	What is a Rail Gun?
		Although the basic ideas underlying the construction of a rail gun are simple, the firing of a typical rail gun projectile results in a tremendous repulsive force.
		Rail guns have also been discussed in the context of peaceful applications such as space travel.
		Another potential application of rail guns may be in the arena of nuclear fusion, where immense pressures and temperatures are required to fuse atomic nuclei together.
	www.wisegeek.com /what-is-a-rail-gun.htm (566 words)

	One Hand Clapping
		Research indicates that a notional first-generation naval rail gun could deliver a guided projectile with an impact velocity of Mach 5 to targets at ranges of 250 miles at a rate of greater than six rounds per minute.
		An important advantage of rail guns is the ability to exploit the high kinetic energy stored in the projectile...
		Rail guns, so named because they don't require an enclosed tube to fire, but use, well, a rail instead, were envisioned decades ago, and were even postulated for awhile as a means of routine space launch.
	www.donaldsensing.com /2004/07/rail-guns-for-navy.html (781 words)

	PowerLabs NEW Rail Gun!
		Rail Guns are not by any means a new technology; 50 years ago when the first true rail guns were built and fired it was believed that they would provide a means to accelerate objects to virtually any desired speed, replace conventional weapons and provide cheap orbital launches for small payloads.
		This would imply that rail guns are most efficient at accelerating light payloads, which would steer research towards smaller bores; however it has been shown experimentally [9] that with very small calibers (<18mm) the efficiency of a railgun decreases with smaller size bores.
		Above 4000m/s rail guns are almost exclusively of the plasma type [3], but secondary arcing tends to limit their performance by lowering efficiency as longer barrels are made [4].
	www.powerlabs.org /railgun2.htm (2789 words)

	Electro-Magnetic Guns (Site not responding. Last check: 2007-10-30)
		One attempt at a gun for higher velocities used differential pistons (a large one, driven by methane/oxygen combustion, connected to a small one for compression of the drive gas) to provide a high pressure of hydrogen gas (hydrogen is the lightest, and hence fastest expanding, of all gasses).
		Two basic types of electromagnetic gun are described in the patent literature, the rail gun and the coil gun.
		The main problem with rail guns is the sliding electrical contact between the rails and the armature.
	users.tm.net /lapointe/EMGuns.html (602 words)

	Rail Gun - Schema-Root (Site not responding. Last check: 2007-10-30)
		A rail gun is any handgun that will allow the easy addition (within a couple of seconds) of a white-light source that can be operated with either the shooting...
		One is a lightning gun, another feature is the rail gun, and the last is a freeze gun that turns enemies to ice.
		Add to this a good range of weaponry (including a natty rail gun that fires depleted uranium shells) and some sharp presentation and everything seems to be...
	schema-root.org /military/weapons/rail_guns (640 words)

	USA Rail Gun
		Rail guns have long been seen as a "Holy Grail" of naval weapons, as the technology promises hypersonic launch velocities without the use of conventional propellants.
		It should also be recognized that the friction generated by the armature as it travels at hypersonic velocities down the gun barrel will not be trivial and that the passing of large amounts of current through the armature will also be a significant contributor to heat build up.
		As a result of these factors, a Rail Gun ship should be able to carry perhaps two to three times as many projectiles as can a conventionally-armed warship.
	www.navweaps.com /Weapons/WNUS_Rail_Gun.htm (901 words)

	Rail gun - HvWiki
		A rail gun is a device that accelerates a projectile using electromagnetic forces.
		This force is against both the rails and the armature/projectile, however since the rails are fixed the armature/projectile is forced down the length of the rails.
		A series augmented rail has the advantage of being able to tune the rails inductance to match that of the entire system, therefore reducing the damping effect and wasted energy.
	wiki.4hv.org /index.php/Rail_gun (462 words)

	GW Online : Warhammer 40,000 : Tau : Tau Rail Rifles
		The result is the rail rifle, a version of the rail gun light enough to be used by a Tau warrior on foot without the aid of a battlesuit.
		At this stage the rail rifle is undergoing field trials with specialist units.
		The Fire Warrior loaded a fresh power cell into the rail rifle as Kassad reminded everyone that although the rifle came pre-loaded with a hundred rounds of trilium-tipped solid darts the energy requirements of the weapon were too great to be met solely by the integrated power cell.
	uk.games-workshop.com /tau/railrifle/1 (1196 words)

	TABLETOP RAILGUN (Site not responding. Last check: 2007-10-30)
		This cutaway view of the POC railgun shows the proper alignment of the rail in relationship to the coils.
		The infrared sensor array runs down one side of the rail and the sensors are placed in 3/8" gaps between each magnet.
		The pre-injector for the gun is a five inch section of track with four unswitched magnets.
	www.glubco.com /weaponry/railgun.htm (1012 words)

	Rail guns (Toby Bradshaw) (Site not responding. Last check: 2007-10-30)
		A rail gun is a mechanical return-to-battery rifle used in the unlimited class in benchrest or for accuracy component testing.
		Bag guns are fast to move from record to sighter target and back, which helps when the wind is switching.
		Rail guns can be fired very fast because no re-sighting is required, so most rail gunners try to run their shot string in a single wind condition (an excellent plan for any shooting, BTW).
	yarchive.net /gun/railgun.html (262 words)

	Jengel and Fatro's Rail Gun Page: Slugs
		A rail gun can fire virtually any type of projectile, provided that a least some portion of it conducts electricity and makes contact with the rails.
		The contact area between the slug and the rails must be as large as possible to keep the current density from welding the two together before the projectile can begin moving.
		In the rail gun case, the sabot allows the best of both worlds, allowing the sabot to be designed for optimum current carrying capacity and heat dissipation while the projectile itself may be designed for stability and drag.
	home.insightbb.com /~jmengel4/rail/rail-slugs.html (545 words)

	Rail Gun Stories
		A projectile fired from a rail gun would reach maximum speed within milliseconds, whereas the chemical propellant that accelerates the Patriot missile takes some time to burn, and maximum speed is reached only after this is finished.
		A rail gun projectile, however, would intercept the target missile almost immediately after the trigger is pulled, meaning the gun can be aimed directly at it, thus improving accuracy.
		The advantage of rail guns is the high speed of their projectiles.
	www.physics.ubc.ca /~outreach/phys420/p420_01/shaun/shaun/rail_gun_stories.htm (733 words)

	Precision Riflesmithing by Bryant Custom: My Rail Gun
		I don't have a scope dedicated to the rail gun, but adjust the base so that a scope can be removed from another rifle, slid onto the dovetail and be zeroed on whichever of the two rifles the scope happens to be on.
		In operation, the shells are fed into the left port and an ejector drops the fired case in the tray as the bolt is cycled.
		The three white balls shown are the contact for the rails milled into the bottom of the top plate.
	www.bryantcustom.com /about/rail.htm (843 words)

	Freespace: System of Chaos
		The Rail Gun is a fighter scale weapon previous found only on Capital Destroyers.
		The Rail Gun fires solid projectiles called "rails." These rails measure just under a half a meter and are composed of a titanium alloy tube packed with uranium depleted mini-shells.
		The power of the Rail Gun is a great asset to attacking ships, however it's low firing rate does not leave room for error.
	members.tripod.com /~fssoc/low/rail.htm (151 words)

	Navy League of the United States - Citizens in Support of the Sea Services
		The rail gun concept would use electricity and magnetic fields to accelerate a projectile, which attacks a target in much the same way as conventional artillery, though with far greater kinetic energy.
		Propellant is not needed in the rail gun concept because clean electricity launches each round down a rail or through a magnetic coil.
		While rail guns, high-powered microwaves and lasers are unlikely to replace conventional munitions outright, McGinnis noted that these technologies would likely co-exist on the ships of the future.
	www.navyleague.org /sea_power/may_04_10.php (1922 words)

	Compact personal rail gun (US5763812)
		A compact bearing ball, or rail, gun to magnetically accelerate ferro-magnetic BBs is disclosed.
		The gun comprises a main board containing a channel sized to allow smooth passage of a BB, a straight portion of that channel forming a barrel terminating at an edge of the main board.
		In a preferred embodiment, the channel has a loading segment substantially perpendicular to the barrel for aligning ferro-magnetic BBs prior to acceleration through the barrel, along with a magnet at the intersection of the loading segment and the barrel for positioning a BB co-centric with the axis of said barrel prior to acceleration.
	www.delphion.com /details?pn=US05763812__ (419 words)

	MetalFatigue.net
		The Rail Gun serves as a launching platform for different types of Turrets.
		Rail Guns may only be built on either the Surface or Orbital Layer.
		In addition, Rail Guns have minimum attacks ranges, meaning they may not be able to fire at targets at very close range.
	www.strategyplanet.com /metalfatigue/structuresa-railgun.shtml (132 words)

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