Traditional nail guns use compressed air, explosive gases or charge, or an electric motor. For permission to reproduce, please write a letter to. If your amplifier can drive a 2 ohm load, then you could consider using 500 feet of 16 gauge, or 14 gauge wire. The tube runs through a series of electromagnetic coils like solenoids. A coil of around 4 ohms is ideal for most audio amplifiers. It is believed that the railgun can reach up to 140 kms. Using the proposed design, the length of the coil gun eml system is shortened by 31% compared with a conventional coil gun system while satisfying a target projectile muzzle velocity of over 100 ms. If it is muzzle energy then projectiles from this weapon deliver. Pressing the trigger loads a steel rod into the barrel, where the first electromagnetic. I built my first one in only a week after i had all the parts. Worlds coilgun arsenal oystein pedersens coilgun original page is down now.
The goal of this article is to help you design and build an electromagnetic coil gun. The driving circuit was implemented as a dynamic model for the simulation of current. Currently, we have been able to reach velocities around 9 kms with the railgun. Its more powerful sibling, the rail gun is already being tested in military applications. If achievable at the velocities and payloads needed for launch to space, this would be an important benefiteliminating a. Current loops induce magnetic flux through their center as the conductive projectile approaches the aircore current loops, two things happen. A pair of 34d by 116 steel washers were used to constrain the coil and aid in winding. Below is a schematic view of the rail gun from the top. Therefore, 14 inch thick wooded slabs will be used for coil stick mounts. This bug could be corrected easily though, removing the washer and using more epoxy. Electromagnetic coil gun co nstruction and basic simulation 91 where v 0 is the init ial speed, t is time and g is gravity a ccelerati on.
Electro magnetic cannon, capacitor 4700uf160v, supply output 100v dc, coil made of dual 0. There is also a chapter discussing velocity measurement of a projectile. The seventh stage burnt the protected diodes and some scrs. The railgun uses a pair of parallel conductors rails, along which a sliding armature is accelerated by the electromagnetic effects. The electromagnetic fea model of the capacitordriven inductance coil gun was constructed to be able to optimize the coil s dimensions. Click on the image below to find out more about them.
A coilgun uses pulsed currents of large magnitude to propel ferrous projectiles at high speeds. In our coil gun, we store high levels of charge within capacitors we discharge it through a coil we build up the charge with a 36 volt source we control the circuit with a dpdt switch and scr. C1 12,000 uf 200wvdc c2 15 uf 25wvdc d1 800v bridge rectifier d2 800v bridge rectifier l1 coil, 56 turns 12 awg p1 iron projectile r1 220 ohm 1 watt r2 25 ohm 25 watt r3 150k ohm 1 watt r4 62 milliohm 5 watt s1 momentary action dpdt centeroff switch s2 dpst power switch. Some simple ways to achieve a strong coil are discussed. Feature comparison the feature differences between magnetic weapons and standard firearms. A coil gun uses a series of electromagnets to propel the projectile down the barrel of the weapon. A coil gun is a device that uses a magnetic field to launch a ferromagnetic projectile. The new book, at the difference of the previous ones, contains four new appendices.
This paper summarizes all important steps during coil gun design, such as physical laws of the coil gun, preliminary. The information contained in this article is potentially dangerous. Second prototype is trying to avoid all the flaws, which were found on the first prototype and find a benefits of using multiple acceleration stages. Pdf electromagnetic coil gun construction and basic. Watch a homemade coilgun destroy a laptop popular science. The survey in its entirety can be found in appendix c. Learn how to make a simple but extremely effective coil gun using only a few parts that are fairly easy to obtain by only going to a few places and possibly online. A coil gun is an electronic gun that fires a projectile by means of the magnetic field generated when a large pulse of current is run through a coil. Conventional projectile propulsion mechanisms include the use of compressed. A coil gun is an electromagnetic projectile launcher.
I tested the coilgun at various charge voltages and different projectile sizes, then calculated the. Rail gun and coil gun designs main overview goals intro railgun accelerator electronics misc. No rail gun, coil gun or laser will ever substitute a firearm. So 18 or 20 gague wire is the best choice for lots of power without overloading your coil driver or amplifier. The nail coil gun project attempts to fill a void in the nail gun market of coil gun based nail guns, while using the advantages of the coil gun to solve some problems associated with conventional nail guns. Development of low cost microcontroller based pulse. These coils are energized sequentially, setting up a traveling magnetic field on the inside of the barrel. Problems with rail guns how rail guns work howstuffworks. Coil guns are so powerful that they are going to be utilized to launch satellites into orbit in the future.
The strategic defense initiative of the 1980s often referred to as star wars was one of the first defense projects to realize the dream of futuristic electronic weapon systems development. The future of the navys electromagnetic railgun could be. The various problems associated with high currents and magnetic fields are discussed, as well as the components and design of my experimental coilgun. Scientists at sandia national laboratories believe that a coilgun can be engineered to accelerate particles at a. Coil construction issues high power coilguns experience large dynamic forces so the coils need to be constructed with inherent strength. An electromagnetic coil gun with three stages of accelerating coils is designed and built.
Development of low cost microcontroller based pulse electromagnetic pulse therapy system for. A coilgun, also known as a gauss rifle is a type of projectile accelerator consisting of one or more coils used as electromagnets in the configuration of a linear motor that accelerate a ferromagnetic or conducting projectile to high velocity. Coilgun technology has the potential advantage that the em forces on the projectile can be selflevitating so that the projectile need not physically contact the walls of the launch tube. The washers and top layer of the coil are held in place with hotmelt glue.
There is more than enough firepower in even a small pistol to accomplish the goal it is intended for and making that pistol fire a projectile through electromagnetic means would only mean making it larger, heavier, more expensive and less practical. After my move from brazil to study in the us i had to leave behind all of my ongoing projects, including the 3kj single stage coil gun and my 7kj multi stage coil gun prototype, both of which were incomplete the multi stage coil gun was crushing the glass coil forms i was using as barrels and the. The completed coil gun in all its ugliness, and no, i couldnt have made it look better or i would have. L1 launching coil p1 iron projectile r1 470 ohm 12 watt, charging resistor r2 11k ohm 14 watt, safety bleeder resistor r3 4. An em railgun that could fire a projectile at 2,500 mph instead of 4,600 mph and hit a target at 50 nautical miles instead of 100 would still be incredibly useful, especially if the navy could. A coilgun is a series of coils that are successively energized as a conductive projectile made from magnetic material passes by them each stage acts on similar principles to those of a solenoid. A rail gun uses a different effect called the lorentz force. Emf schematics w parts lists numrich numrich gun parts. They have imported accutech, citadel, excel, howa, and issc pistols. The railgun has a much larger possible power than a powder gun. The coil was made using 26g wire wound on the body of a pen. No, this is not one of the scifi video game replica weapon props i keep posting aboutits a real, functioning homemade coilgun by jason, aka youtube user larsplatoon, aka photobucket and user saz43, who has been working on it for two years. They use a current to charge copper wires and create an electromagnet to launch a projectile. Coil guns may sound like futuristic weapons, but theyre actually something you can build at home.
Be willing to spend more than a week on this and you might need a few heavy power tools only to make good projectiles. The coil gun was not designed for really shooting applications, i. Electromagnetic coil gun design and construction 117 a b fig. If the current persists after the projectile exits the coil it will act to decellerate the projectile, which does defeat the purpose of the whole thing. Threestage coil gun final project report december 8, 2006 e155 dan pivonka and michael pugh abstract. The projectile normally does not contain explosives, instead relying on the projectiles high speed and kinetic energy to inflict damage.
The switch hanging out the side is the firing switch, which needs replacement. Mathematics covers some of the math used in electromagnetics. The barrel of a coil gun is a series of copper coils. It is also one of the most powerful weapons in the quake game series. Electric machine gun is silent nov, 1936 this is a pretty cool looking rail gun. Coil gun feeding mechanism william ciarniello 5 survey results surveys for this project were distributed to several individuals who have either experience with coil guns, or firearms in general to limit inaccurate results on the survey. This homemade gun uses electromagnetic coils to send steel rods flying at a speed of 8 feet per second. Transformers current ratios i s is the current through the secondary inductor i p is the current through the primary inductor the one connected to a power source n s is the number of turns in the secondary inductor n p is the number of turns in the primary inductor note power i p v p i s v s is conserved in an ideal transformer in real transformers there is loss heat. Our intuition tells us that it will not be a constant because the back emf will reduce the total voltage drop across the coil, and. Actually, from the description given, it would be a coil gun, not a rail gun.
Electromagnetic coil gun elektromagnetic cannon youtube. A singlestage, sensorless, coil gun was designed to demonstrate the capability to accelerate a ferromagnetic projectile to high velocity. Efficient coil gun drive requires the coil to maintain current while the projectile is accelerating, and only cut the current when the projectile is in the coil. Whether i use 1, 2, or 3 coils, all coils are now mounted atop a 24 inch wooded slab. A coil gun is a type of rifle that uses an electromagnetic accelerator coil or a series of coils to accelerate a metallic projectile. Coil gun, as many people think including me is not just a fun toy with a tube and few coils around it which can shoot projectiles to a certain distance. Diy, batterypowered coilgun destroys all toys wired. A railgun is a device, typically designed as a weapon, that uses electromagnetic force to launch high velocity projectiles. Energy sources suggestions about what can be used to power a coilgun. A coil gun or gauss gun is an electromagnetic launcher that offers a few advantages over rail guns. Coil guns require no explosive propellant, therefor can be fired an infinite amount of time, providing that there is ammunition and available electricity. It accelerates a piece of iron or steel down a tube. Not only was balsa stripping, but also it began to warp with lengths approaching my new standard coil stick mount length of 24 inches. General info overviewgoals schematics railgun prototype.
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