Water Bottle Rocket

Last week I was at Camp Ireland, a great Cub Scout day camp (meaning we didn't spend the night). It was a ton of fun, the kids really had a great time. They played games, built stuff, shot bb guns, did some archery, learned about nature, and shot off water bottle rockets! They take a 2-liter soda bottle, fill it almost all the way up with water, turn it upside down on this pvc pipe, put a pin in to hold it in place, then use a tire pump to fill it with air - they pump it to 60 psi. Once it's pumped, a scout pulls the pin out, the bottle shoots into the air leaving a trail of water and getting the scouts wet as they try to catch it, which they love. Some went higher than others and some got stuck in the trees. I'm going to suggest they let the scouts do this twice during the week next year as it's something they really enjoy. Might have to find plans to build one of these and do it at a den meeting. ;)