| 摘要 |
An vertical take-off and landing (VTOL) and horizontal flight (HF) aircraft has a fuselage with wings providing lift during horizontal flight, a rotor on the nose of the fuselage that is stowable during horizontal flight, a first pair of ducted fan propellers on the wings, a second pair of tiltable ducted fan propellers adjacent to the tail, a hydraulic system powered by the main engine and generating propulsive hydraulic power for the rotor system and the first and second pairs of propellers. A control system for the hydraulic system provides propulsive hydraulic power to the rotor system and to the second pair of propellers during vertical take-off and landing and not to the first pair of propellers during vertical take-off and landing and provides propulsive power to the first and second pairs of propellers during horizontal flight and not to the rotor system during horizontal flight.
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