Trebuchet; now you're talking! Youngest and I built one out of scrap as a school project using this handy online calculator. The machine is still around somewhere. We could lob marbles 15m across the garden and have them land consistently in a small wooden bowl. It was commended by class vote; it was the only machine that didn't naff out under test. Heh heh!
You don't need elastic for a trebuchet; it's all done by a falling weight and a long lever.
www.algobeautytreb.com/
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