GB847616A - Improvements in jet propelled aircraft - Google Patents

Abstract

847,616. Controlling jet-propelled aircraft. POUIT, R. Dec. 27, 1956 [Dec. 29, 1955], No. 39361/56. Class 4. [Also in Group XXVI] In an aircraft powered by at least one pair of jet-propulsion engines, an auxiliary propulsion nozzle is provided on each side of the aircraft so that in the event of failure of one engine, the auxiliary nozzle on that side of the aircraft may be supplied by the operative engine on the other side to maintain symmetrical thrusts about the longitudinal axis of the aircraft. When both or all engines are operating, propulsive gases may be fed to spanwise extending slots at the trailing edges of the wings, such slots being capable of downward deflection to increase lift. Engines 1 1 and lz are mounted in the wings 2. For engine 1 1 , it comprises a turbine 4 1 driving a relatively low pressure axial flow compressor 6 1 and a high pressure centrifugal compressor 9 1 , the former delivering air to a chamber 8<SP>1</SP> and the latter to combustion chambers 10 1 to supply a main propulsion nozzle 12<SP>1</SP>. The chamber 8<SP>1</SP> and, for engine 1<SP>2</SP>, chamber 8 2 connect to conduits 20<SP>1</SP> and 20<SP>2</SP> respectively extending through the wings and also connect to a central chamber 16 which extends into ducts 17 1 and 17 2 provided with normally closed valves 18 1 and 18 2 , which ducts terminate in annular auxiliary nozzles 14 1 and 14 2 surrounding the main nozzles 12 1 and 12 2 . In the event of failure of, say engine 1 2 , the air intake to the engine is closed by mechanism not shown and valve 18z is opened to supply pressure air to burners 15 2 in nozzle 14 2 whereby an auxiliary propulsive jet is created to balance the jet from the opposite main nozzle 12 1 . The air in ducts 20 1 and 20z, indicated by reference 20 in Fig. 2, is exhausted through a spanwise slot 23 to the interior of a wing trailing edge flap comprising an upper element 28 and a lower element 25 which form a propulsive slot 29. Suction slots 34 for boundary layer control communicate with the interior of the flap through ducts 35. Duct 20 and element 25 rotate about a pivot 24 and element 28 rotates about a pivot 30, the two elements being connected by linkwork so that when the flap is lowered the slot 29 increases in size, the downwardly directed jet therefrom increasing the wing lift. The duct 20 houses a feed pipe 36 supplied with hot gases from the main propulsive jet by apparatus consisting of a dividing panel within the nozzle which forms an upper chamber 38 and a lower chamber 37. Gearing 43, 44 operates flaps 40, 41 such that the upper chamber is closed thereby forcing gases through pipe 36 the gas from the lower chamber being deflected downwardly to provide a lifting force.