> Also with sled geometry fixed you can change the projectile without changing the coil timings. I don't think this is true unless the mass of the projectile i

> Also with sled geometry fixed you can change the projectile without changing the coil timings. I don't think this is true unless the mass of the projectile is negligible compared to the sled. if so, you are spending most of your energy moving something that does not deliver KE to the target. or unless all your projectiles have about the same mass, which also seems like an inconvenient constraint.