Aeronautics and astronautics – Aircraft – heavier-than-air – Airplane and fluid sustained
Patent
1992-07-15
1994-05-17
Barefoot, Galen L.
Aeronautics and astronautics
Aircraft, heavier-than-air
Airplane and fluid sustained
244 23B, 244 60, B64C 2900
Patent
active
053120698
ABSTRACT:
The invention is a propulsion system for powering an aircraft in both vertical and horizontal flight modes. In detail, the invention includes first and second gas-driven ducted lift fans mounted in the aircraft for providing thrust in the vertical flight mode. First and second shaft-driven ducted cruise fans that have inlet ducts and bypass air ducts that are mounted in the aircraft for providing thrust in the horizontal flight mode and supercharged air for the engines in all flight modes. First and second gas transfer ducts couple the bypass air ducts of the first and second ducted cruise fans to the first and second turbo compressors, respectively. First and second shaft-driven turbo compressors are mounted in the first and second gas transfer ducts, respectively. First and second high-pressure feed ducts couple the first and second shaft-driven turbo compressors to the first and second ducted lift fans, respectively. A combustor is mounted in each of the high-pressure feed ducts, the combustor for providing high energy gases for driving the ducted lift fan. First and second sets of turboshaft engines are mounted in the aircraft with each one of the sets comprising a plurality of the turboshaft engines, each of the turboshaft engines including an output shaft and having an optimal power output sufficient for powering one of the ducted cruise fans in the horizontal flight mode, each of the sets having a sufficient number of the turboshaft engines to provide an optimal power output for powering one of the turbo compressors and one of the ducted cruise fans in the vertical flight mode.
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Bollinger Robert S.
Nicolai Leland M.
Barefoot Galen L.
Dachs Louis L.
Lockheed Corporation
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