What type of vessel cannot be propelled by paddles?

A hovercraft is a type of vessel that cannot be propelled by paddles because it operates on a cushion of air created by fans, allowing it to travel over various surfaces, including water, land, and mud. This unique propulsion system relies on air rather than traditional means used in vessels like rowboats or catamarans, which can effectively be navigated using paddles. The hovercraft's design is specifically tailored for its intended operational environment, making it distinct from other watercraft that utilize paddles or oars for movement.