Di Pietro Air Engine
You can find a video about this here: https://youtu.be/wd9CVSlXoWo
In addition you will need 6 x skate bearings (22mm x 8mm x 7mm) and 6 x small rubber bands and some superglue
You can find a video about this here: https://youtu.be/wd9CVSlXoWo
In addition you will need 6 x skate bearings (22mm x 8mm x 7mm) and 6 x small rubber bands and some superglue