1935 airboat.
Fullsize image: https://s3-us-west-1.amazonaws.com/h...t_fullsize.jpg
https://s3-us-west-1.amazonaws.com/h...35_airboat.jpg
Previously:
https://www.homemadetools.net/forum/...596#post143264
https://www.homemadetools.net/forum/...626#post143400