Abstract: A device for improving performance of an aircraft with a propeller includes a constant torque blade setting device that slaves, automatically and independently, blade setting angles, respectively associated with blades of the propeller, to a constant reference control moment predetermined, for a desired propeller thrust value. The blade setting angles are intended to be applied on each blade such that torsion aerodynamic moments applied on blades stay roughly equal to the reference control moment regardless of the angular position of blades in the propeller plane. A corresponding method for improving performance of an aircraft includes the use of the constant torque blade setting device to slave blade setting angles to a constant reference control moment.

Abstract: Disclosed is a set of aerodynamic surfaces for an aircraft. There is included in the set a fixed aerodynamic surface delimited by two external walls which, at the rear, converge toward one another. A mobile flap extends the external walls, forming a mobile trailing-edge. An actuator is positioned so as to cause the mobile flap to rotate. A vane runs in the overall direction of the span of the fixed aerodynamic surface, and rotates with the flap.

Abstract: Method and device for improving performance of an aircraft comprising at least one propeller engine without propeller fairing. According to the invention, the device (10) comprises means (2) for slaving, automatically and independently, blade setting angles (?), respectively associated with blades (B) of the propeller, to a constant reference control moment (Mc) predetermined, for a desired propeller thrust value, and intended to be applied on each blades (B), such that torsion aerodynamic moments (M) applied on blades (B) stay roughly equal to the reference control moment (Mc) whatever the angular position of blades (B) in the propeller plane of rotation is.

Abstract: Set of aerodynamic surfaces for an aircraft. According to the invention, inside the rear part of the fixed aerodynamic surface on which a mobile flap is mounted, there is a vane that rotates as one with the flap and is able to generate an antagonistic moment that opposes the hinge moment of said flap.