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Failed inventions compilation.
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Previously:
https://www.homemadetools.net/forum/...486#post162305
https://www.homemadetools.net/forum/...160#post184533
https://www.homemadetools.net/forum/...617#post151722
https://www.homemadetools.net/forum/...064#post100646
https://www.homemadetools.net/forum/...195#post221712
The walking machine wasn't really a failed invention. A version of that mechanism has been used on large equipment for many years.
The bike with the sails would have been a very challenging thing to ride. Wow
The first one is more 'art bike' than invention; I seem to remember seeing it somewhere before. The second is very much like the modern elliptigo https://www.elliptigo.com/, the tiny bikes are still sold today https://www.unicycle.com/udc-mini-bike/ (plus dozens of DIY builds scattered among the internets. )
Here's a lot of bike sail designs https://www.youtube.com/watch?v=uDeFUJBfcHU