Air vehicle

An air vehicle comprising:

• a body;
• an engine mounted on the body, the engine configured to generate force for flight of the air vehicle;
• a rotor coupled with the engine and extending outward from the body, the rotor configured to rotate around itself;
• a shaft positioned within the rotor, the shaft configured to be driven by the engine and to rotate around an axis along which the shaft extends;
• a plurality of blades connected with the shaft, each blade of the plurality of blades configured to be driven by the shaft to move;
• a plurality of flaps, wherein each flap of the plurality of flaps is located on a respective blade of the plurality of blades, each flap configured to apply a drag force to the rotor based on a position of the flap on the respective blade;
• wherein each flap has a closed position in which the flap corresponds to an aerodynamic surface of the respective blade without extending outward from the respective blade;
• wherein each flap has an open position to which the flap moves from the closed position, wherein in the open position the flap extends outward from the respective blade and increases the drag force acting on the rotor;
• a plurality of fasteners positioned in the plurality of blades, wherein the plurality of fasteners allow the plurality of flaps to be attached to the plurality of blades movably;
• and
• a triggering member extending along the shaft and mechanically coupled with the shaft, the triggering member being movable relative to the shaft in a direction parallel to the axis of the shaft, the triggering member comprising at least one protrusion extending outward from the triggering member,
• wherein the triggering member is configured to contact the plurality of fasteners via the at least one protrusion to simultaneously rotate the plurality of fasteners around respective axes of the plurality of fasteners and move the plurality of fasteners in the plurality of blades along respective directions in which the plurality of fasteners extend, thereby allowing the plurality of flaps to move between the closed position and the open position on the plurality of blades,
• wherein the triggering member is configured to bring each flap positioned on an advanced side of a respective blade to the open position in sequence depending on a direction of movement of the air vehicle during rotation of the rotor, thereby creating drag for the rotor.