Leonardo da Vinci designed a paddle boat powered by rotating paddles for travel on rivers.
Leonardo’s drawings show a vessel whose paddles were driven by a mechanical system rather than by sailors pulling individual oars. Cranks, gears, and transmission components would transfer human effort to the paddle wheels. The arrangement aimed to make propulsion more continuous and efficient on calm waterways.
This concept belongs to Leonardo’s broader investigations of water transport in the late 15th and early 16th centuries. He examined hull forms, canal navigation, locks, and methods for reducing the labor needed to move boats. The paddle design was an experiment in mechanical propulsion, not a steam-powered vessel.
Leonardo’s boat is sometimes incorrectly described as a steamboat because later powered boats also used paddle wheels. His design had no steam engine and depended on human power. There is no reliable evidence that a full-scale version was built and operated during his lifetime.