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Rocketdyke writes in regarding our post on how to make an end-around pneumatic (potato) cannonBill Mills has had diagrams for a pneumatic air cannon on his website for at least 10 years. It was one we built back in the early 90s. He also shows how to make a sabot using styrofoam cups to launch odd-shaped items that won’t get a good seal on the inside of your PVC.”Link.