A propulsive force imparted to an object is vectored using rotatable members arranged in one or more arrays disposed in the path of a fluid ejected by a fluid accelerator unit, such as air ejected by a fan driven by a gas turbine engine. The propulsive force is vectored by changing the rotation of one or more of the rotatable members.

A propulsive force imparted to an object is vectored using rotatable members arranged in one or more arrays disposed in the path of a fluid ejected by a fluid accelerator unit, such as air ejected by a fan driven by a gas turbine engine. The propulsive force is vectored by changing the rotation of one or more of the rotatable members.

A rotor blade of a wind power installation, comprising an inner section in which the rotor blade is fastened on a rotor hub, and an outer section, which is connected to the rotor blade and comprises a rotor blade tip. The rotor blade has at least partially a flat back profile having a truncated rear edge in the inner section, and at least one control unit for controlling the wake is provided on the rotor blade on the flat back profile.

A propulsive force imparted to an object is vectored using rotatable members arranged in one or more arrays disposed in the path of a fluid ejected by a fluid accelerator unit, such as air ejected by a fan driven by a gas turbine engine. The propulsive force is vectored by changing the rotation of one or more of the rotatable members.

A fluid interface device, such as an airfoil assembly, can include a device structure and at least one movable band oriented such that the band moves in a direction of fluid flow. The at least one movable band can be supported on the device structure such that an outer surface of the movable band is exposed along the device structure and is capable of movement relative thereto such that a relative velocity can be maintained between the outer surface and the device structure. The fluid interface device can also include an edge extension disposed along the leading edge of the device structure. An airplane, a wind turbine and a method are also included.

A fluid interface device, such as an airfoil assembly, can include a device structure and at least one movable band oriented such that the band moves in a direction of fluid flow. The at least one movable band can be supported on the device structure such that an outer surface of the movable band is exposed along the device structure and is capable of movement relative thereto such that a relative velocity can be maintained between the outer surface and the device structure. The fluid interface device can also include an edge extension disposed along the leading edge of the device structure. An airplane, a wind turbine and a method are also included.

A remote control system for an aircraft includes an aircraft of the Magnus-effect type. The aircraft includes a cylinder extending along a longitudinal axis. The cylinder is able to rotate about the longitudinal axis. A pair of rotatable elements are arranged at a distance from the aircraft. A drive means is designed to drive a rotational movement of the pair of rotatable elements. A connection cable is arranged to connect the pair of rotatable elements to the cylinder of the aircraft in such a way that the rotational movement of the pair of rotatable elements, driven by the drive means, is mechanically transmitted to the cylinder of the aircraft so as to cause the cylinder to rotate about the longitudinal axis.

A remote control system for an aircraft includes an aircraft of the Magnus-effect type. The aircraft includes a cylinder extending along a longitudinal axis. The cylinder is able to rotate about the longitudinal axis. A pair of rotatable elements are arranged at a distance from the aircraft. A drive means is designed to drive a rotational movement of the pair of rotatable elements. A connection cable is arranged to connect the pair of rotatable elements to the cylinder of the aircraft in such a way that the rotational movement of the pair of rotatable elements, driven by the drive means, is mechanically transmitted to the cylinder of the aircraft so as to cause the cylinder to rotate about the longitudinal axis.

A method for controlling a flying projectile which rotates during flight, comprising: determining an angle of rotation of an inertial mass spinning about an axis during flight, and controlling at least one actuator for altering at least a portion of an aerodynamic structure, selectively in dependence on the determined angle of rotation and a control input, to control aerodynamic forces during flight. An aerodynamic surface may rotate and interact with surrounding air during flight, to produce aerodynamic forces. A sensor determines an angular rotation of the spin during flight. A control system, responsive to the sensor, produces a control signal in dependence on the determined angular rotation. An actuator selectively alters an aerodynamic characteristic of the aerodynamic surface in response to the control signal.

A method for controlling a flying projectile which rotates during flight, comprising: determining an angle of rotation of an inertial mass spinning about an axis during flight, and controlling at least one actuator for altering at least a portion of an aerodynamic structure, selectively in dependence on the determined angle of rotation and a control input, to control aerodynamic forces during flight. An aerodynamic surface may rotate and interact with surrounding air during flight, to produce aerodynamic forces. A sensor determines an angular rotation of the spin during flight. A control system, responsive to the sensor, produces a control signal in dependence on the determined angular rotation. An actuator selectively alters an aerodynamic characteristic of the aerodynamic surface in response to the control signal.