Head on over to the blog of paper engineer, Rob Ives, to follow along as he works out the geometry and mechanics of the classic tumbling acrobat toy. Ives is dissecting the motion of a Japanese version of the tumbler toy to figure out how to recreate it in paper. Incredible!
From his recent blog post:
In essence, the tumbler has three parts. the body with the sliding weight, the arms and the legs. I traced the three parts and experimented with different stills from the YouTube video to work out where the joints should be.
Here is a link to the latest blog post about the paper tumbling acrobat by Rob Ives.