What type of vehicle did Leonardo da Vinci design to move on water using paddle wheels?

Leonardo da Vinci designed a paddle-wheel boat intended to move on water using mechanical paddle wheels.

The concept used rotating wheels fitted with paddles to push against the water. Turning the wheels would create forward motion without relying entirely on oars or sails. Leonardo’s drawings show his interest in adapting rotary mechanisms for transportation and in making water travel more controllable.

The design belongs to a broader group of Renaissance proposals for boats, bridges, canal machinery, and water-raising devices. Leonardo often treated water as both a physical system to study and a practical environment for engineering. His notebooks examine currents, resistance, locks, and the operation of mechanical parts.

Leonardo’s paddle-wheel boat was not a steam-powered paddle steamer. Steam engines and practical powered paddleboats appeared centuries later. It was also distinct from a galley, whose main propulsion came from human rowers. The Renaissance design was an early mechanical concept rather than a demonstrated modern motorboat.