Lightweight vessel with a kart-like appearance of the type consisting of a lightweight vessel shell, the deadworks thereof being built with all the additions of a kart, the vessel being essentially characterized in that it consists of a shell of a light vessel (1), in the middle part of which there is a propulsion motor (2) which transmits the power to the driving means (4) via transmission means (3), the deadworks consisting of an assembly of elements that form part of the aesthetics of a competition kart, especially consisting of an aerodynamic seat (6) surrounded by aerodynamic side panels (12), an aerodynamic front panel (17), an aerodynamic rear panel, and four wheels (14) with the corresponding mudguards (15) thereof.