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Dorodango - the Art of Polishing Dirt!
Epic Homemade Adjustable Stilts!
The water is a moving part. It is the piston used to compress the air. Still awesome! Not practical, but that was never the point. Would be useful for emergency, wouldn't leave it outside, sunlight and weather are terrible for plastics, but I bet you already know that.
The mixer design is absolutely genius! Any idea how fireproof papercrete is? I think of paper as burning easily, but have no idea of papercrete.
How to build a Rocket Mass Heater
PVC pipe, one of the most useful things man has made. It can be rigid, flexible, easily cut or bent. I have used it to make a ladder to my attic, a bow and quiver, hand pump for the cistern, air cannons, and used it for actual water pipe. Now I am presented with a possible new use. Thank you.
This looks really fun, two issues though. 1 Wear a lifejacket 2 Legal issues of using a bridge for purposes other than its intended ones. I could just see the police bringing an unpleasant end t the fun. Personally I think this is a great extra use of a bridge, but there are those people who will not like your out of box thinking.