Greetings fellow smart people. I am looking into making a device that can accurately launch a penny 0.0m to 10.0m quite accurately. I do not know whether I should a siege projectile launcher such as a catapult or trebuchet or something using compressed air. I want to try to make this out of common household stuff and recyclables but I probably will have to buy a few things from a hardware store. I don’t want it to be dangerous and I am willing to spend a lot of time and patience on it. I myself am interested in air, but then again I have no idea how to make one without using compressed co2 or a bike pump. I want it to be made with a home made compressor. Trebuchet and catapult are fairly simple but aren’t that original. If you guys know of any other mechanisms that can launch a penny accurately please let me know or tell me which one I should use. Thanks a lot.