A LeTourneau D4 "Flying" Tournapull tractor. They were dropped out of airplanes to construct runways for future planes to land, and then demolished per instructions in the manual. 2:28 video:
https://www.youtube.com/watch?v=i1DTC6-0T6M
Previously:
https://www.homemadetools.net/forum/...726#post118766
https://www.homemadetools.net/forum/...9192#post88833
https://www.homemadetools.net/forum/...9096#post88652
