A battery the size of a truck trailer would be able to fling a volume/weight of ammo about the size of a truck trailer, either all at once or more likely eventually. You'll be lucky if your battery size/weight is much smaller than the ammo it flings for a bunch of basic chemistry reasons. The battery size reflects the "clip" size. You have your engineering constraints wrong. Temperature is a big limiting factor, since you can only heat the gas so far before your materials fail. Now there are some ways around this issue.
While there is some play with the adiabatic ratio, if you compress a gas and then chill it back to the same temperature but higher density, the speed of sound will not have significantly changed. The speed of sound is dependent on the temperature and molecular weight of the gas, but not on the pressure directly. the pressure is so high in the barrel that the speed of sound might be 2 or 3 times, maybe even more, than the speed of sound in sea level air.Īlmost right. That "speed of sound in the barrel" is interesting to think about. Another reason chem propellants suck is the projectile can never, ever travel faster than the speed of sound of the column of compressed high pressure gas in the barrel, but at least in theory theres no reason an infinitely complicated coil gun couldn't launch stuff at any ridiculous speed.
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