Abstract: A method for improving a blade in an end zone of the blade, spanwise along the blade, and such an improved blade and a rotor comprising the improved blades. The leading edge of the aerodynamic profiles situated in the end zone is shifted from the upper surface half-profile towards the lower surface half-profile, then the leading edge sections of the two half-profiles are modified in order to connect the leading edge to the intermediate sections of the two half-profiles. Next, the blade is manufactured according to the modified aerodynamic profiles. Consequently, the negative camber of the aerodynamic profiles of the blade is thus increased, helping improve the aerodynamic performances of the blade during hovering flight.

Abstract: A method for improving a blade in an end zone of the blade, spanwise along the blade, and such an improved blade and a rotor comprising the improved blades. The leading edge of the aerodynamic profiles situated in the end zone is shifted from the upper surface half-profile towards the lower surface half-profile, then the leading edge sections of the two half-profiles are modified in order to connect the leading edge to the intermediate sections of the two half-profiles. Next, the blade is manufactured according to the modified aerodynamic profiles. Consequently, the negative camber of the aerodynamic profiles of the blade is thus increased, helping improve the aerodynamic performances of the blade during hovering flight.

Abstract: A rotorcraft extends longitudinally along a first anteroposterior plane separating a first side from a second side of the rotorcraft. The rotorcraft includes at least one main rotor, an auxiliary rotor, and at least one steerable airfoil. The rotorcraft further includes a processor unit connected to a first measurement system configured to measure a current value of a speed parameter (V) of the rotorcraft and to a second measurement system configured to measure a current value of a power parameter (W) of a power plant of the rotorcraft. The processor unit is configured to adjust the deflection angle of the airfoil as a function of the current speed and power parameter values (V, W) to cause the auxiliary rotor to move towards at least one predetermined operating point which optimizes performance of the rotorcraft and minimizes noise generated by the auxiliary rotor.

Abstract: The present invention provides a method of driving a main rotor (2) of a rotorcraft (1) in rotation. A regulation setpoint (C) for a power plant (3) used for driving the main rotor (2) at a variable speed of rotation is generated by a control unit (4) and is transmitted to a regulator unit (5) for regulating the operation of the power plant (3). The value of an initial setpoint (NRini) is generated progressively and continuously depending on variation in the current value of the density (D) of the ambient air outside the rotorcraft (1). The value of the initial setpoint (NRini) is potentially corrected depending on predefined flight conditions of the rotorcraft (1). Prior to being transmitted to the regulator unit (5), the value of the regulation setpoint (C) is preferably limited to a range of acceptable speeds for driving the main rotor (2) in rotation.

Abstract: A rotorcraft extending longitudinally along a first anteroposterior plane (P1) separating a first side from a second side of the rotorcraft. Said rotorcraft is provided with at least one main rotor, with an auxiliary rotor, and with at least one airfoil. Said rotorcraft includes a processor unit connected to mover means for pivoting said airfoil, the processor unit being connected to a first measurement system for measuring a current value of a speed parameter of the rotorcraft and to a second measurement system for measuring a current value of a power parameter (W) of said power plant for adjusting the deflection angle of the airfoil.

Abstract: The present invention provides a method of driving a main rotor (2) of a rotorcraft (1) in rotation. A regulation setpoint (C) for a power plant (3) used for driving the main rotor (2) at a variable speed of rotation is generated by a control unit (4) and is transmitted to a regulator unit (5) for regulating the operation of the power plant (3). The value of an initial setpoint (NRini) is generated progressively and continuously depending on variation in the current value of the density (D) of the ambient air outside the rotorcraft (1). The value of the initial setpoint (NRini) is potentially corrected depending on predefined flight conditions of the rotorcraft (1). Prior to being transmitted to the regulator unit (5), the value of the regulation setpoint (C) is preferably limited to a range of acceptable speeds for driving the main rotor (2) in rotation.