Abstract: The invention relates to an aircraft (1).

Abstract: 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).

Abstract: The invention relates to an aircraft (1).

Abstract: The invention relates to a hydraulic ram pump, comprising: a propulsion water line fed with propulsion water, a delivery line which can be connected to delivery water via a bottom valve, a ram pump valve which is connected to the propulsion water line and delivery line, the propulsion water flowing into the delivery line when the ram pump valve is open and, after the closing of the ram pump valve, the water column flowing further in the delivery line sucking in delivery water via the bottom valve, the ram pump valve being held by spring force in its closed position separating the propulsion water line from the delivery line, and a pressure reservoir being provided, which is connected to the propulsion water line upstream of the ram pump valve in the direction of flow, the valve member being of annular design, axially movable and tightly connected to the delivery line, the effective cross section of this connection being larger than the cross section of the valve seat, and the valve seat of the ram pump valve

Abstract: The invention relates to a thermal machine having a housing (2, 2a, 2a', 2b) which defines an operating space, an operating space, an operating medium which is contained in the operating space, a heat source (6, 6') which is arranged in the housing (2, 2a, 2a', 2b) as well as a heat sink (5, 5') which is arranged in the housing (2, 2a, 2a' 2b), a regenerator (7, 7') which forms an intermediate heat store which is mounted such that it can move linearly in the operating space, and at least one operating piston (4, 13, 14, 20, 20', 25) which is acted on by the operating medium, for outputting mechanical power from the operating space, and for coupling mechanical power from the operating space.