Lego Pneumatic Sk8r

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I started out trying to build a biped pneumatic COG shifting walker using 2 pistons for the leg movement with the foot movement provided by ball joint linkages... it didn't work out so I put skates on the legs :)

Meet Sk8r, it runs off my 8 pump air compressor and travels 1 meter in 14 seconds.

Here is a movie clip of Sk8r in action (.wmv, 10 secs, 1.05mb)

Schematic for the pneumatic circuit.

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