A rotorcraft includes a fuselage, rotors and circular wings. The rotors are attached to the fuselage. The rotors are attached to the fuselage. The circular wings are disposed under the rotors respectively. Upper surfaces of the circular wings have annular curved surfaces and thereby are convex upward respectively. The circular wings cause Coanda effects by the upper surfaces respectively. First lift is generated by rotating the rotors. Second lift is generated by the Coanda effects by the circular wings. Third lift is generated by air jets deflected downward along the upper surfaces of the circular wings respectively.

Aerolift systems and methods using one or more air ducts and one or more lifting bodies. The duct may have a turn angle from the inlet to the outlet. The duct may have a variable cross-sectional area, such as increasing from inlet to outlet. The lifting body may be an airfoil. A propulsion unit, such as an electric motor and rotating blades, moves air through the duct and to the lifting body. The flow of air against and/or over the lifting body creates an aerodynamic lifting force. The flow of air downward may provide lift. The total lifting force may be used to move a moveable component. The aerolift system may be used in various applications, including aircraft and industrial systems. An aircraft may include the lifting body, or multiple lifting body segments, defining an annular shape, such as rounded or polygonal.

The invention relates to an engine (2) for a flying body (1), with an annular vortex guide element (3) which, seen in section, has an air inlet opening (6) arranged centrally with respect to a longitudinal central axis (4) of the engine (2) and, at a distance from the air inlet opening (6), an air outlet opening (7) arranged centrally with respect to the longitudinal central axis (4), which are connected to one another in terms of flow via an intake duct (5) bounded by the vortex guide element (3) and accommodating an air conveying device (8), wherein the air outlet opening (7) is overlapped by an air deflecting element (9) which is arranged geodetically above the vortex guide element (3) during intended operation of the engine (2) and which extends radially outwards from the air outlet opening (7) so that it delimits with the vortex guide element (3) an air exit gap (11) which is in flow connection with the air outlet opening (7). It is provided that the vortex guide element (3) is in the form of a body of rotation which is formed by rotation about an axis of rotation of a closed curve having a continuous course at least on its radially outer side, and in that the air inlet opening (6) opens directly into an outer environment (19) of the engine (2), so that during intended operation of the engine (2) air is conveyed from the side of the engine (2) facing away from the air deflecting element (9) through the air inlet opening (6) into the intake duct (5). The invention further relates to a method for operating an engine (2) for a flying body (1) as well as a flying body (1) with at least one engine (2).