Title: Hydraulically operated aircraft with a retractable propeller

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Abstract: An aircraft body has a pair of hydraulic fluid-operated motors mounted on it, a pair of stream-creating devices driven by the motors and symmetrically arranged on opposite sides of the body. One or more hydraulic fluid-flow producing devices has at least a pair of separate fluid-handling chambers each connected to one of a pair of separate outlets, and including arrangements for fluid-tight separation of the chambers and outlets, so that fluid from each chamber passes through only one of the outlets. A pair of displacement units is associated with the fluid-handling chambers, respectively, and an equally acting actuator arrangement cooperates equally with both of the two displacement units for maintaining equal movements of the two displacement units so that fluid flows in the outlets at proportionate and equal flow rates. A pair of delivery passages connects each of the outlets with a different one of the motors, respectively. A wing is attached to the body of the aircraft and includes at least one hollow space for the reception of a foldable propeller. The foldable propeller is attached to a hydraulic motor and driven by it. The hydraulic motor drives the propeller when the propeller is located outside of the hollow space and when the blades of the propeller are extended normal to the axis of the hydraulic motor. The blades of the propeller can be swung into a position about parallel to the axis of the hydraulic motor and the motor and propeller can then be retracted into the hollow space in the wing for rest.


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