A kayak sail system includes a sail including a first extending arm, a second extending arm, and a sail sheet supported between the first extending arm and the second extending arm. A deployment body for the sail includes a base plate supporting a first deployment arm and a second deployment arm. The first deployment arm is coupled to the first extending arm of the sail. The second deployment arm is coupled to the second extending arm of the sail. A support arm is spaced apart from the base plate. A first support post and a second support post extend from the support arm. A first extension spring extends from the first deployment arm and a second extension spring extends from the second deployment arm. The first extension spring is removably coupled to the first support post. The second extension spring is removably coupled to the second support post.

A nestable wing sail having two or more sections. Where one section is configured to nest inside the first section, and can move out of the first section to extend the effective sail area of the wing sail.

The subject of the invention is an arrangement for displaying the airflow conditions around the sails, including a wind sensing device (200a, 200b, 200c, 450), a central device (600) and a signal transmission device (300a, 300b), and at least one of the wind sensing devices (200a, 200c, 450) being a built-in wind sensor device fixed on the sail (200a, 200b, 200c). It is characterized in that the built-in wind sensor device (200a, 200b, 200c) is connected to the central device (600) and contains electronic units. The process for the application of the arrangement is also a subject of this invention.

The subject of the invention is an arrangement for displaying the airflow conditions around the sails, including a wind sensing device (200a, 200b, 200c, 450), a central device (600) and a signal transmission device (300a, 300b), and at least one of the wind sensing devices (200a, 200c, 450) being a built-in wind sensor device fixed on the sail (200a, 200b, 200c). It is characterized in that the built-in wind sensor device (200a, 200b, 200c) is connected to the central device (600) and contains electronic units. The process for the application of the arrangement is also a subject of this invention.

Embodiments described herein relate generally to a sailing vessel that can substantially obviate the heeling problem experienced by classical sailboats. During navigation, the sailing vessel is driven forward by an aerodynamic force exerted by wind on the sail, and balanced by a hydrodynamic force exerted by water on a float on the stern of the sailing vessel, the aerodynamic force and the hydrodynamic force being parallel or substantially parallel to a longitudinal axis of the sailing vessel.

Techniques are provided for an unmanned surface vehicle including a vehicle body and a rigid square-rig wing coupled with the primary vehicle body. The rigid square-rig wing includes a first surface configured to interact with wind to generate a force that propels the primary vehicle body in a direction of travel that is primarily composed of drag, and a second surface configured to interact with the wind to generate a force that propels the primary vehicle body in a direction of travel that is primarily composed of lift. The unmanned surface vehicle further includes a rudder and a control system comprising a controller, the control system configured to determine a rudder position and generate a signal to position the rudder to the rudder position.

The invention relates to a sail having a variable profile. The sail can vary between a folded non-operative position and an unfolded operative position, wherein they determine the profile of the sail (2) and therefore the aerodynamic surface for contacting with the wind, characterised in that the sail comprises at least one sail element (24) which is inflatable and stiffenable, and which can be actuated by inflation (30) and stiffening means (29), between a folded position corresponding to said folded non-operative position and said unfolded operative position, in which the sail (2) is inflated. The profile of the sail is divided into sections (21, 22) on both sides of a shaft (20), and comprises a support structure (23) on which said inflatable sail elements (24) are disposed, said inflatable sail elements being formed by inflatable pockets (24) which can be actuated by said inflation (30) and stiffening means (29).

The invention relates to a sail having a variable profile. The sail can vary between a folded non-operative position and an unfolded operative position, wherein they determine the profile of the sail (2) and therefore the aerodynamic surface for contacting with the wind, characterised in that the sail comprises at least one sail element (24) which is inflatable and stiffenable, and which can be actuated by inflation (30) and stiffening means (29), between a folded position corresponding to said folded non-operative position and said unfolded operative position, in which the sail (2) is inflated. The profile of the sail is divided into sections (21, 22) on both sides of a shaft (20), and comprises a support structure (23) on which said inflatable sail elements (24) are disposed, said inflatable sail elements being formed by inflatable pockets (24) which can be actuated by said inflation (30) and stiffening means (29).

Embodiments of the present invention are directed to a passive, automatic wing-control mechanism for sailing vessels. A cam is attached to one end of a rotatable mast as part of a rotatable wing, and a tensioner is configured to exert a constant force perpendicularly against the cam. When a wing is in a no-go sailing angle with respect to an apparent wind, the cam does not exert a torque on the mast. When the wing is outside the no-go sailing angle, the cam exerts a counter-torque to a torque caused by the apparent wind acting on the rotatable wing, causing the wing to remain at a predetermined angle with respect to the apparent wind.

Embodiments of the present invention are directed to a passive, automatic wing-control mechanism for sailing vessels. A cam is attached to one end of a rotatable mast as part of a rotatable wing, and a tensioner is configured to exert a constant force perpendicularly against the cam. When a wing is in a no-go sailing angle with respect to an apparent wind, the cam does not exert a torque on the mast. When the wing is outside the no-go sailing angle, the cam exerts a counter-torque to a torque caused by the apparent wind acting on the rotatable wing, causing the wing to remain at a predetermined angle with respect to the apparent wind.