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Theory 1 - The straight line rail gun for sheer speed
You build the gauss rifle in a straight line, much like the toy example. You build it with the highest durability magnets possible. I wonder what type of speeds you could produce before the acceleration physically destroys the device (magnet breakage)
Theory 2 - The Electromagnetic Circle
Same principle, inside the vaccuum tube, but this time you use controlled electromagnets to propel the projectile. Im not sure if this is possible.. I think it is? Could you not build it so that the magnets are underneath the track and that ball never has to collide with the magnet? It is turned off and on in a controlled manner (laser?) Basically the first magnet atttracts the projectile, is shut off, and the next electromagnet is turned on and it attracts to there and so on and so on going in a circle. Now we have this in a vaccum tube we remove the air resistence. We thus have limitless speed ( air speed that is ) We still have friction. This principle uses only one projectile.