Boat with pedal-powered paddles.
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Previously:
https://www.homemadetools.net/forum/...765#post133147
https://www.homemadetools.net/forum/...423#post135495
https://www.homemadetools.net/forum/...075#post130022
https://www.homemadetools.net/forum/...833#post129268
https://www.homemadetools.net/forum/...064#post100646