Goodyear Inflatoplane.
https://s3-us-west-1.amazonaws.com/h...flatoplane.jpg
4:50 video:
https://www.youtube.com/watch?v=_3-ZG_rg2Zk
More: https://en.wikipedia.org/wiki/Goodyear_Inflatoplane
Previously:
https://www.homemadetools.net/forum/...2388#post96186
https://www.homemadetools.net/forum/...433#post146835
https://www.homemadetools.net/forum/...969#post129628
https://www.homemadetools.net/forum/...156#post141495
