Abstract: The present invention relates to an aircraft flight indicator intended to supply a data item regarding the power margin available on at least one engine of the aircraft as a function of the flight conditions. According to the invention, the indicator comprises: a sensor (2) capable of delivering data relating to the speed (Ng) of the gas generator of the engine; means (3) for calculating, using the data relating to the speed (Ng) of the gas generator, a data item .DELTA.Ng representing the difference between the actual value of Ng and the reference value on take-off and for processing said data so that it can be displayed; and display means (4) showing the data relating to the values of the speed Ng of the gas generator and/or of .DELTA.Ng on a display screen (5).

Abstract: The present invention relates to a rotary-wing aircraft, especially such as a helicopter, of the compound type including:a fuselage (2),fixed-wing elements (6) arranged on either side of said fuselage (2),at least one main rotor (4),an anti-torque rear rotor (9), anda rear thruster propeller (14), arranged at the end of the tail boom (8) of said fuselage (2).According to the invention, said rear thruster propeller (14) has a shroud (15).