Abstract: The invention relates to an axial turbomachine compressor outer casing. The casing comprises a sealing device collaborating with a row of rotor blades. The casing comprises a wall with an annular groove in which the sealing device is housed. The sealing device comprises a segmented outer shroud and a plurality of piezoelectric actuators moving the shroud radially in the groove so as to open or close the functional clearance. The invention also proposes a method for controlling a sealing device for a turbojet engine, the method comprising a step of measuring the altitude and a step of adjusting a clearance according to the altitude.

Abstract: The invention relates to an axial turbomachine compressor outer casing. The casing comprises a sealing device collaborating with a row of rotor blades. The casing comprises a wall with an annular groove in which the sealing device is housed. The sealing device comprises a segmented outer shroud and a plurality of piezoelectric actuators moving the shroud radially in the groove so as to open or close the functional clearance. The invention also proposes a method for controlling a sealing device for a turbojet engine, the method comprising a step of measuring the altitude and a step of adjusting a clearance according to the altitude.

Abstract: An airplane having at least one turbojet and means for taking at least a portion of the boundary layer of the flow of air over a surface of the airplane and for guiding the air that has been taken to an air inlet of the turbojet, the airplane being characterized in that the means for guiding air include means for diffusing the air that has been taken circumferentially in uniform manner over 360° at the air inlet of the turbojet.

Abstract: A vehicle (1) includes a chassis (2) which has a steering assembly (3) at one end and at least one wheel at the other end. The steering assembly includes a pair of steering wheels (4a, 4b) and an interconnecting steering carriage (4) for turning the wheels about a steering or turning axis (ZZ?). An extensible cylinder (6) is connected between the chassis and the steering linkage for rotating it about a transverse axis (YY?) which, in turn, inclines the steering axis (ZZ?). Preferably, the extensible cylinder is controlled in accordance with the speed of the vehicle.