Turbine robotic inspection crawler.
Fullsize image: https://diqn32j8nouaz.cloudfront.net...r_fullsize.jpg
https://diqn32j8nouaz.cloudfront.net...on_crawler.jpg
Previously:
https://www.homemadetools.net/forum/...189#post149877
https://www.homemadetools.net/forum/...218#post109858
https://www.homemadetools.net/forum/...724#post136804
https://www.homemadetools.net/forum/...841#post100173
