Leonardo da Vinci designed a paddle boat that used rotating paddles to propel a vessel through water.
His notebooks contain studies of boats and mechanisms for converting human effort into forward motion. In a paddle boat, paddles push against the water and generate thrust. Leonardo’s concept used a mechanical transmission to connect the operator’s movement with paddle wheels, potentially allowing a boat to move without relying on wind.
The design belongs to Leonardo’s broader interest in hydraulic engineering and mechanical power. It was not a steam-powered ship: steam engines and practical steamboats came centuries later. Nor was it simply a conventional oared boat, because the paddles were arranged as a rotating mechanism rather than individual oars worked independently.
Leonardo’s boat projects were proposals and studies, not documented voyages. Their historical importance comes from showing how he analyzed propulsion, gearing, and water resistance together. Paddle propulsion later became widely important in riverboats and early steamships.