GB955364A - Aircraft with jet engines arranged symmetrically for producing lift - Google Patents

Abstract

955,364. Jet propelled and supported aircraft. DORNIER-WERKE G.m.b.H. Feb. 20, 1962 [Feb. 21, 1961], No. 6458/62. Heading B7G. An aircraft having direct lift jet propulsion engines arranged symmetrically has one or more further jet propulsion engines arranged in or on the fuselage for producing forward thrust, and duct means arranged to conduct part of the gases of the further engines to direct lift nozzles, either symmetrically to assist in lifting, or asymmetrically in the case of failure of an engine, to maintain a symmetrical total lift force. In Fig. 1, engines T1 and T2 normally feed direct lift nozzles 1, 2, and 4, 5, respectively. Engines T3 and T4 on the fuselage provide forward propulsion, and part of their working fluid such as by-pass air may be led through taps 7, 8, valve 9, and ducts 10, 13, to downwardly directed nozzles 11, 12, on the undersurface of the wings. Part of the working fluid is led to control jets at the tail, as indicated at 16. Should either engine T1 or T2 fail, the whole or most of the gases in duct 10 are led to the appropriate one of nozzles 11 and 12, to prevent excessive rolling moments. Alternative nozzles such as 11<SP>1</SP> and 12<SP>1</SP> may be chosen to correct rolling moments more exactly. The duct between each engine T1, T2 and its inboard nozzle contains a valve 3, 6, connected by branch 14, 15, to duct 13, so that if say, engine T1 fails, it can be isolated from nozzle 2, which is then fed through duct 14 from duct 13, either by engines T3 and T4, or by engine T2, which then feeds only nozzles 2 and 4. Valve movements may be made manually or automatically. Should there be only one horizontal propulsion engine, and should that fail, the valve 9 may feed the control jet duct 16 from engines T1 and T2.