While hydrofoils lift out of the water thanks to an underwater fin, hydroplanes zoom along by riding directly on the surface ...

the propeller unfolds and powers the boat. When motor torque is cut off, the propeller folds to cut drag for more efficient sailing. With the Hybrid, Gori has added a new locking mechanism that ...

Most famous of these is probably the toroidal propeller that made waves a while ago, mostly in the field of flying drones, but commercial toroidal boat props exist too. Test results of the ...