Twin and triple-engine tractors by Harry Lee. 5:27 video.
https://www.youtube.com/watch?v=MHrKhsUsS6c
Previously:
https://www.homemadetools.net/forum/...596#post123275
https://www.homemadetools.net/forum/...405#post131512
https://www.homemadetools.net/forum/...445#post131720
https://www.homemadetools.net/forum/...4233#post79570
https://www.homemadetools.net/forum/...674#post167099
https://www.homemadetools.net/forum/...957#post133803
