This is my traditional gun I use to celebrate Independence Day. I have a 10 lb bag of potatoes and a full can of hairspray. What are you shooting today?
I never built a true Tater gun. But, we used to launch tennis balls over the dorm with a similar device. Sometimes we didn't launch anything and just made noise.
Only, we used cans, duct tape and lighter fluid. Makes me want to go build one now.