Snowmobile racing. 3:11 video.
https://www.youtube.com/watch?v=HsdwPV5w8jI
Previously:
https://www.homemadetools.net/forum/...699#post159493
https://www.homemadetools.net/forum/...854#post171294
https://www.homemadetools.net/forum/...847#post105589
https://www.homemadetools.net/forum/...459#post127631
https://www.homemadetools.net/forum/...025#post145080