Abstract: An arrangement for a horizontally and vertically flying aircraft of the type that for vertical flight has rotors that form a lifting area such as in a helicopter, and where the rotors are retracted within a rotor disc (4) during horizontal flight. The rotors (8) are supported with fixed pitch in the rotor disc (4). The centre point of the lifting area is arranged to be capable of being shifted in an xy plane, or means are provided to be brought at determined points within the lifting area of the rotor disc (4) to break the lifting capabilities in the effective rotor disc for manoeuvring and counteracting differential lift during propulsion of the aircraft in vertical flight and on the transition from vertical to horizontal flight.

Abstract: A seat, especially a child's seat with a seat component adjustable on a frame for use in a motor vehicle where the frame member is divided into a lower section for securing to the motor vehicle, and an upper section for possible releasable securing of the seat component. The frame member's upper and lower sections have mutually facing convex contact surfaces for movement in relation to each other, and that between the convex contact surfaces there is provided a weight for movement between a first and second position. Furthermore the frame member's upper and lower sections are equipped with guides, preferably first and second guide pieces for movement between the first and the second position. The weight is releasably secured by a locking element in the first position and by a second locking element in the second position, and there are further provided buffers in order to check the seat's kinetic energy.