IMPROVEMENTS RELATING TO JET-PROPELLED AEROPLANES

摘要

1,253,834. Jet propelled aircraft. BRITISH AIRCRAFT CORP. Ltd. 10 April, 1969 [10 April, 1968], No. 17303/68. Addition to 1,135,100. Heading B7G. [Also in Division F1] In a jet-propelled aircraft as claimed in parent Specification, a number of gas generators 21 are combined in a single unitary assembly 11 and contained within the outer shell 26 of the propulsion engine. The assembly 11 comprises a front fan 18 having variable pitch blades, a turbine 20 which drives fan 18 via shaft 19, and two vertically spaced gas generators 21; each generator 21 comprises compressor stages 22, combustion chambers 23 and a turbine 24 which drives the compressor stages. Air from variable aperture intakes 16 is passed to the compressor stages via ducts 17 and front fan 18; air is also passed through by-pass duct 25 from fan 18, and exhausts through variable aperture nozzle 29 with the efflux from the gas generators. .Conventional combustion equipment is mounted in chambers (27) in the by-pass duct at both sides of the gas generators, air from duct 25 being fed thereto by ducts (251), Fig. 2 (not shown), and exhausting through nozzle 29. Power plant control lines and the like pass into the aircraft through a duct 31; engine accessories may be mounted within the shell 26 to reduce the connections through duct 31. The shell 26 is connected to the fuselage 10 by mounting ring 30. The gas generators may drive separate turbines each geared to front fan 18 via a shaft coaxial with the respective generator and a free-wheel coupling. The aircraft has variable sweep wings 12. One or both gas generators may be employed, according to whether the aircraft is climbing or cruising; for maximum thrust, the duct combustion equipment is used.