Rail Gun





Introduction: Rail Gun

Building a railgun in 15 minutes. The railgun is a device for accelerating an object by running electric current through it along a pair of rails.



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    :( can someone help me i made this but when i did it the 2 magnets on the nail stuck to the aluminum foil instead of flying off

    1 reply

    the projectile needs to already be moving forward, otherwise it will just be welded to the "rails".

    Cool but a stronger magnet is needed

    Instead of gluing foil just use aluminum duct tape used to seal A/C ducts. It will stick to just about anything !

    Can you use more power to make it more powerful?

    1 reply

    HAHAHA, now kids if you're crazy like you take this to a whole new level buy using a microwave transformer and aluminum pipes from home depot and scare the s**t out of yourself when you fire it, then a year later propose to rebuild it and make it "better"

    Personally, I would call this a hompolar motor, not a railgun.
    Also, what is the orientation of the magnetic field of the disc magnets? Axial, or diametric?

    2 replies

    A railgun is a series of electromagnets which get turned on and off in sequence to propel the projectile... So…

    No. What you mean is a coilgun. A railgun uses a different mechanism, like Wikipedia says:
    "A railgun is an entirely electrical gun that accelerates a conductive projectile along a pair of metal rails using the same principles as the homopolar motor. Railguns use two sliding or rolling contacts that permit a large electric current to pass through the projectile. This current interacts with the strong magnetic fields generated by the rails and this accelerates the projectile."

    Hey i need help, i want to make a from scratch 60's slot car track and car using this concept, but i wanna run it off the wall plug in and have an adjustable throttle with more than one speed

    3 replies

    the car wont follow the foil, unless you mean to make slots in wood or something and line it with metal. otherwise you just need to add somekind of switch to increase/decrasese voltage

    duhh thats the whole point of a *slot car* but ya I know someone who is writing an equation to determine the resistors needed, and if u already know, we would like around 32-36 volts now cause we used 2 9 volts and it was pretty wimpy.

    Yeah but mains is ac but bateries are dc...

    theoretically, couldn't a road be made like this? And cars with giant magnet wheels?

    5 replies

    monorails do this already, like millenniumman said, and if we did this on roads, it would require more aluminum than you could probably find in the entire solar system... and would need to be continuously replaced as it wore down. Although my question is, why on EARTH ARE YOU TOUCHING THAT THING DIRECTLY?! Iron conducts electricity quite well... wouldn't you be shocked by manually placing that thing on there?

    A)he used ALUMINIUM foil not iron B) Its a nine volt PP3 battery. you are not going to get a shock from that.


    just a funny taste when you stick it to your tongue :)

    Done that before and got a shock...

    what if there was a black out...?