1930 Demenjoz sail-powered glider - GIF

Sail-powered glider built in 1930 by Swiss inventor John Domenjoz.

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Previously:

https://www.homemadetools.net/forum/...536#post177987
https://www.homemadetools.net/forum/...650#post143487
https://www.homemadetools.net/forum/...175#post161177
https://www.homemadetools.net/forum/...507#post127929
https://www.homemadetools.net/forum/...339#post161699

Hahahahahahaha! I hear Boeing is using this on their next generation passenger jets to save on fuel, but the sails have to be made of carbon fiber to withstand 500 knots airspeed. There'll even be a little hatch in the top of the fuselage, so the flight attendants can go up and hoist signal flags in the event of a radio failure. They are all about the safety, now.