I'm thinking of making a low powered coil gun, but I don't have a lot of experience with electricity and electromagnets, and I have a few concerns about the following setup.
For the thing that turns the coil on and off, I was wondering if using the projectile as a bridge between two contacts in the barrel would work. The idea is that when the projectile reaches the two contacts, it would complete a circuit that turns on the power supply for the next coil, and also turns off the previous coil if there is one. So for a single stage gun there would be two sets of contacts, the ones that turn the coil on, and the ones that turn it off.
Do you think this would work, or should I try something else?