Cambering device for a profiled sail comprising: - an elastically deformable semi-rigid structure, including: -- two length sections, extending in front of one another, respectively forming a first length section secured to a first surface of the profiled sail, and a second length section secured to a second surface of the profiled sail, -- a U-shaped connecting section, interconnecting, by extending them, the first length section and the second length section at the leading edge of the profiled sail, the two length sections terminating at the trailing edge of the sail in two free ends (23, 24), - actuating means interconnecting, on the one hand, the two free ends (23, 24) of the semi-rigid structure, or at least one of the two free ends (23, 24) and, on the other hand, the U-shaped connecting section, configured to camber the first length section and the second length section of the semi-rigid structure by tensioning the two free ends (23, 34) with the U-shaped connecting section of the semi-rigid structure, or at least by tensioning one of the two free ends (23, 24) with the U-shaped connecting section of the semi-rigid structure, and generating an offset (d) between the two free ends (23, 24), characterised in that the actuating means comprise at least one actuator (40, 41), having two longitudinal ends (40a; 41a, 40b; 41b, said actuator (40, 41), which is activatable, being retractable when activated with the bringing together of its two longitudinal ends, said at least one actuator (40, 41) extending along one of the two length sections of the semi-rigid structure, first length section or second length section, said actuator (40, 41) being internal to the semi-rigid structure, contained in a plane of the semi-rigid structure, and in that one of the longitudinal ends (40a, 41a) of said at least one actuator (40, 41) is connected to one of the two free ends (23, 24) by an internal tendon while the other one (41a, 41b) of the two longitudinal ends of said at least one actuator (40, 41) is connected either to an anchoring point (221, 222) secured to the U-shaped connecting section, or to the other one of the two free ends (23, 24) via an angle transmission secured to the U-shaped connecting section by an external tendon, the flexible external tendon passing outside the semi-rigid structure, and the profiled sail between the angle transmission and respectively said other one of the two free ends (23, 24). - an elastically deformable semi-rigid structure, including: -- two length sections, extending in front of one another, respectively forming a first length section secured to a first surface of the profiled sail, and a second length section secured to a second surface of the profiled sail, -- a U-shaped connecting section, interconnecting, by extending them, the first length section and the second length section at the leading edge of the profiled sail, the two length sections terminating at the trailing edge of the sail in two free ends (23, 24), -- two length sections, extending in front of one another, respectively forming a first length section secured to a first surface of the profiled sail, and a second length section secured to a second surface of the profiled sail, -- a U-shaped connecting section, interconnecting, by extending them, the first length section and the second length section at the leading edge of the profiled sail, the two length sections terminating at the trailing edge of the sail in two free ends (23, 24), - actuating means interconnecting, on the one hand, the two free ends (23, 24) of the semi-rigid structure, or at least one of the two free ends (23, 24) and, on the other hand, the U-shaped connecting section, configured to camber the first length section and the second length section of the semi-rigid structure by tensioning the two free ends (23, 34) with the U-shaped connecting section of the semi-rigid structure, or at least by tensioning one of the two free ends (23, 24) with the U-shaped connecting section of the semi-rigid structure, and generating an offset (d) between the two free ends (23, 24),