Abstract: A landing arresting system for vertical take-off and landing aerial vehicles. A landing and take-off platform and at least one vertical take-off and landing locking member have a projecting portion arranged at a lower portion of the vehicle. The landing and take-off platform includes a plurality of individually displaceable rolls, arranged substantially in a horizontal direction, and moveable back and forth, such that the projecting portion of the locking member can be entered, retained and released between two adjacent rolls. A landing and take-off platform for vertical take-off and landing aerial vehicles and a vertical take-off and landing locking member for aerial vehicles.

Abstract: A fastener and an attachment assembly. The fastener includes a bolt having a first bolt portion, a second bolt portion and an intermediate bolt portion arranged between the first bolt portion and the second bolt portion. The first bolt portion is conical and the second bolt portion is threaded. A first bushing has a conical inner surface arranged in circumferential abutment to the first bolt portion and a nut to be threadedly engaged to the second bolt portion. The attachment assembly secures objects to each other and includes at least two bores, arranged through the objects, including a first bore portion, a second bore portion and an intermediate bore portion, respectively. The intermediate bore portion is arranged between the first bore portion and the second bore portion. The attachment assembly also comprises at least two fasteners, each fastener is arranged inside the bores, respectively.

Abstract: A rotor damper for a tail rotor of a helicopter. A main body of a resilient material is to be arranged between a drive shaft for the tail rotor and a hub on which rotor blades for the tail rotor are coupled. A flange is connected to the main body of the rotor damper. The flange includes an abutment surface for abutting an outer surface of the hub. A tail rotor including the rotor damper.

Abstract: An unmanned aerial vehicle helicopter including a dismountable tail section including a torque compensating rotor. Power transmission from the motor to the torque compensating rotor is accomplished by pulley-and-belt drive arrangements.

Abstract: A landing arresting system for vertical take-off and landing aerial vehicles. A landing and take-off platform and at least one vertical take-off and landing locking member have a projecting portion arranged at a lower portion of the vehicle. The landing and take-off platform includes a plurality of individually displaceable rolls, arranged substantially in a horizontal direction, and moveable back and forth, such that the projecting portion of the locking member can be entered, retained and released between two adjacent rolls. A landing and take-off platform for vertical take-off and landing aerial vehicles and a vertical take-off and landing locking member for aerial vehicles.

Abstract: A main rotor arrangement for an UAV-helicopter. A rotor mast defines a vertical axis of rotation. A hub is for attachment of rotor blades. The hub is mounted to the rotor mast in a tiltable way so as to reduce loads acting on the rotor blades during operation of the UAV-helicopter. A damping assembly is configured to damp the tilting of the hub.

Abstract: Helicopters with removable fuel tanks Each fuel tank is a removable fuel tank. Each fuel tank is removable and can safely be stored on ships and aircraft carriers.

Abstract: An unmanned aerial vehicle helicopter including a dismountable tail section including a torque compensating rotor. Power transmission from the motor to the torque compensating rotor is accomplished by pulley-and-belt drive arrangements.

Abstract: A main rotor arrangement for an UAV-helicopter. A rotor mast defines a vertical axis of rotation. A hub is for attachment of rotor blades. The hub is mounted to the rotor mast in a tiltable way so as to reduce loads acting on the rotor blades during operation of the UAV-helicopter. A damping assembly is configured to damp the tilting of the hub.

Abstract: A rotor damper for a tail rotor of a helicopter. A main body of a resilient material is to be arranged between a drive shaft for the tail rotor and a hub on which rotor blades for the tail rotor are coupled. A flange is connected to the main body of the rotor damper. The flange includes an abutment surface for abutting an outer surface of the hub. A tail rotor including the rotor damper.