Abstract: An aircraft includes an airframe including a fuselage, a wing, and a tail, a main propulsion unit, including a motor and a propeller, a flight control device, including electric actuators, movable surfaces and sensors, and an autopilot computer sending instructions to the main propulsion unit and to the flight control device. Such unmanned aircraft further includes a pair of auxiliary propulsion units, each auxiliary propulsion unit including an electric motor, a propeller driven by the electric motor, and means for orienting the plane of the propeller with respect to the airframe, the flight control computer being programmed for setting a steering angle and a propeller speed of each auxiliary propulsion unit so as to compensate for a malfunction of the flight control system and/or of the main propulsion unit, in order to control the trajectory along all axes, the unmanned aircraft thereby exhibiting increased reliability.

Abstract: An upper casing with a hollow shell made of composite materials. The shell was a side wall that extends in elevation from a housing flange to a housing collar, the side wall including at least one cutout. The upper casing includes an internal liner that is inserted inside the shell and that is fastened to an inside face of the shell, the liner comprising a base and a top, together with at least two legs extending in elevation from the base to the top, the liner further comprising at least one equipment support in register with a cutout, each equipment support being for carrying a removable piece of equipment of the upper casing.

Abstract: An upper casing with a hollow shell made of composite materials. The shell was a side wall that extends in elevation from a housing flange to a housing collar, the side wall including at least one cutout. The upper casing includes an internal liner that is inserted inside the shell and that is fastened to an inside face of the shell, the liner comprising a base and a top, together with at least two legs extending in elevation from the base to the top, the liner further comprising at least one equipment support in register with a cutout, each equipment support being for carrying a removable piece of equipment of the upper casing.