A friend of mine wants me to build him a Trebuchet to launch refrigerators at least a mile I have been thinking about a, air cannon to launch bowling balls to shoot down his projectiles. I had a 3000 gallon pressure tank until I decided to make a water tower out of it. It is still capable of holding up to 150PSI as long as the valves are shut off. I guess I could always add a 12" pipe nipple and a large valve and still use it. I don't know do you think it possible to reach sub orbital velocity with enough air pressure and volume? I can get more pressure tanks

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