Tractor helicopter.
Fullsize image: https://diqn32j8nouaz.cloudfront.net...n_fullsize.jpg
https://diqn32j8nouaz.cloudfront.net..._copter_jn.jpg
Fullsize image: https://diqn32j8nouaz.cloudfront.net...n_fullsize.jpg
https://diqn32j8nouaz.cloudfront.net..._copter_jn.jpg
Previously:
https://www.homemadetools.net/forum/...990#post224255
https://www.homemadetools.net/forum/...157#post214478
https://www.homemadetools.net/forum/...312#post218683
https://www.homemadetools.net/forum/...170#post157685
https://www.homemadetools.net/forum/...107#post214380