Here’s another unique pedal-powered machine; the AutoCanoeTM.
The Autocanoe Is a Pedal Powered Amphibious Recumbent Tricycle and a Roadable Pedal Canoe! The configuration is that of a Recumbent Tricycle with the two forward wheels driving and the single rear wheel steering both on land and in the water. It can travel over the road and through the water with comfort and grace. Transitions from land to water and back are accomplished smoothly and seamlessly without leaving your seat. On the road it is stable and secure. On the water it is tractable and relaxing. This human powered vehicle appeals to bicycle enthusiasts as well as wooden boat fans.
It was built by some guy in Washington state; he thought it was a great enough idea that he trademarked the name and is selling plans for $30 a pop. The thing looks like it’d be kinda fun on the water, but getting anywhere on land would be difficult. It’s got to weigh a ton, and can’t be very maneuverable (or very fast). Look at that front overhang; you’d almost have to build a steel plate into the prow of the thing for all the approaches you’d be smacking into.