This is an ordinary 2-liter soda bottle launched from a launch pad made from PVC pipe with a valve stem at one end. You fill the bottle about one third full of water, then pump air into the system until it builds up enough pressure to force the bottle to overcome friction and launch into the air. We were getting the bottles to go up about 30 feet in the air (higher than the houses), and the wind was pushing them all over the place.
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