Vintage motorcycle racing with steerable sidecars.
https://s3-us-west-1.amazonaws.com/h...cle_racing.jpg
Previously:
https://www.homemadetools.net/forum/...8541#post87726
https://www.homemadetools.net/forum/...269#post116169
https://www.homemadetools.net/forum/...309#post121825