The invention relates to a system and method of sail propulsion for sailing vessels and tugboats, consisting of one or more rows of sails secured at their upper vertices or corners by means of the ends of masts, and cables or ropes located between the upper ends of the masts, or the ends of the radial arms of said masts, with masts provided in the bow and others in the stern. The sails are secured at their lower vertices or corners to rings fixed to the deck, to ropes or cables, the ends of which are attached to the deck, to small posts, to the lower region of the main masts, to the ends of radial arms fixed in the lower region of the masts, or to pulleys on which the cables are wound using motors. The rows of sails, aligned from bow to stern, include a mast at the end sails. Cables or ropes form the upper ends of the intermediate sails.

The invention relates to a water-going assembly comprising a first buoyant structure (S1) comprising at least two hulls (F1, F1; F11, F11, F12, F12) delimiting between them a space (E1) and a photovoltaic arrangement (PH1) occupying a substantial proportion of the footprint of the buoyant structure, and a second buoyant structure (S2) provided with an electric thruster (P2) and with a battery (B2), means for assembling the two buoyant structures detachably, with means of electrical connection between the photovoltaic arrangement of the first buoyant structure and the battery of the second buoyant structure, the latter being able to be used for moving the two structures (S1, S2) with a directional guidance, or as an autonomous motorized marine craft.

The invention relates to a water-going assembly comprising a first buoyant structure (S1) comprising at least two hulls (F1, F1; F11, F11, F12, F12) delimiting between them a space (E1) and a photovoltaic arrangement (PH1) occupying a substantial proportion of the footprint of the buoyant structure, and a second buoyant structure (S2) provided with an electric thruster (P2) and with a battery (B2), means for assembling the two buoyant structures detachably, with means of electrical connection between the photovoltaic arrangement of the first buoyant structure and the battery of the second buoyant structure, the latter being able to be used for moving the two structures (S1, S2) with a directional guidance, or as an autonomous motorized marine craft.