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US 2013/0009004 A1 Jan. 10,2013 INTERNALGASTURBINEPROPULSION THRUST REVERSER BACKGROUND [0001] Thisinventionrelatestointernalgasturbinepropul sion aircraft and, more particularly, to a thrust reverser for an internalpropulsionaircraft. [0002] Militarytransportaircraftfacemanydif?cultchal lenges to accomplish their missions. Oftentimes, they must land in combat Zones Where there may be short runWays and litlegroundsupportequipmentavailable.Therefore,theair craft must be capable of high deceleration so that the it can approach the airstrip at high speed (to reduce exposure to nearby enemy forces) but stil land in on short runWay, all While carrying a heavy load. The aircraft also must be able to taxi in reverse Without the assistance of a pushback tractor. [0003] NeWmilitarytransportaircraftalsomustmeetthe requirement of having a loW radar cross section, Which leads to a loW observable aircraft that is more dif?cult to detect usingradar.Thisrequirementissatis?edusingstealthtech nology. Part of stealth technology includes using an internal propulsionsystemthatisinternaltotheWingsand/orfuselage andisthereforehidden,concealed,andunexposed. [0004] Moderngasturbineengineaircraftincludethrust reversers to sloW the aircraft during landing. These thrust reverserstypicallyemploypartsoftheenginenacelletodirect propulsion gas forWard. Because the propulsion systems on stealth aircraft are mounted internally, there is no exterior engine nacelle that can serve as a thrust reverser. SUMMARY [0005] Accordingtothepresentinvention,athrustreverser foragasturbineengineincludesahinge,apropulsionsystem duct, and a kicker blocker. Bypass air and gas path air travel throughthepropulsionsystemductandthepropulsionsys tem duct has an intake inlet and an exhaust outlet. The kicker blockerhasakickerportionandablockerportion.Thekicker blocker is rotatably attached to the hinge and is movable betWeen a stoWed position and a deployed position. The blockerportionextendsintothepropulsionsystemductWhen thekickerblockerisinthedeployedpositiontoblockbypass airandgaspathairtravelingthroughthepropulsionsystem duct in a ?rst direction prior to the exhaust outlet, thereby redirecting the bypass air and the gas path air in a second direction. [0006] Inanotherembodiment,aninternalpropulsionair craftincludesafuselage,aWingextendingfromthefuselage, and an internal propulsion system. The propulsion system is positioned Within a propulsion system duct in one of the fuselage or the Wing, and the propulsion system includes an intakeinlet,afan,agasturbineengine,anexhaustoutlet,and a thrust reverser. The thrust reverser ispositioned betWeen the gas turbine engine and the exhaust outlet of the propulsion system, the thrust reverser being movable betWeen a stoWed positionandadeployedposition,Whereinthethrustreverser blocks the propulsion system duct When in the deployed position. BRIEF DESCRIPTION OF THE DRAWINGS [0007] FIG.1AisafrontperspectivevieWofaninternal propulsionaircrafthavingapluralityofthrustreversers,each inthedeployedposition. [0008] FIG.1BisafrontperspectivevieWofapropulsion systembrokenoutoftheinternalpropulsionaircraftalong line1B inFIG. 1A havingthethrustreverserinthedeployed position. [0009] FIG.2isafrontperspectivevieWoftWothrust reversersinthedeployedposition. [0010] FIG.3Aisacross-sectionvieWalongline3-3in FIG. 2 of a thrust reverser in the stoWed position. [0011] FIG.3Bisacross-sectionvieWalongline3-3in FIG. 2 of a thrust reverser in the deployed position. [0012] FIG.4AisasidevieWofanalternateembodiment actuator having a lock lever. [0013] FIG.4BisasidevieWofarotaryactuatorhavinga Worm gear. DETAILED DESCRIPTION [0014] InFIG.1A,afrontperspectivevieWofinternal propulsion aircraft 10 having thrust reversers 14A-14D is shoWn, each inthe deployed position. ShoWn inFIG. 1A are internalpropulsionaircraft10,propulsionsystems12A-12D, thrust reversers 14A-14D, fuselage 16, Wings 18A-18B, tail 20, intake inlets 22A-22B, exhaust outlets 24A-24B, and landinggear26. [0015] Thestructuralairframeofinternalpropulsionair craft 10 is comprised of three main sections: fuselage 16, Wings 18A-18B, and tail 20. More speci?cally, Wings 18A 18B andtail20areconnectedtoandextendfromthesidesand rear of fuselage 16, respectively. Landing gear 26 also pro trudes from the bottom of fuselage 16 When aircraft 10 is on the ground but is stoWed Within fuselage 16 When aircraft 10 is in ?ight. The shape of aircraft 10 and the materials it is constructedfromresultinaloW-observableaircraft10having a small radar return signal. This quality is due in part to the location of propulsion systems 12A-12D. [0016] Propulsionsystems12A-12DarelocatedWithinthe airframeofaircraft10.Intheillustratedembodiment,propul sion systems 12A-12D are located Within fuselage 16. Typi callyduringoperation,propulsionsystems12A-12Btakein airAthroughintakeinlet22A andexpelexhaustgasG rear Ward through exhaust outlet 24A. Similarly, propulsion sys tems12C-12DtypicallytakeinairAthroughintakeinlet22B andexpelexhaustgasG rearWardthroughexhaustoutlet24B. During typical operation of propulsion systems 12A-12D, such as during ?ight, thrust reversers 14A-14D are in the stoWedposition(asshoWninFIG.3A).When thrustreversers 14A-14D areinthedeployedposition(asshoWn inFIG. 1A), substantiallyalofexhaustgasG isexhaustedupWardand forWard through thrust reversers 14A-14D. [0017] Thecomponentsandcon?gurationofthrustrevers ers14A-14DasshoWninFIG.1AalloWforexhaustgasG to be redirected to leave propulsion systems 12A-12D, respec tively, traveling in a forWard and upWard direction. This exerts reactionary doWnWard and rearWard forces on aircraft 10,Whichassistsaircraft10tostopduringlanding(byboth providing reverse thrust and increasing braking force from landing gear 26). It also provides su?icient reverse thrust to propelaircraft10rearWardWhen itisontheground.Thereby, aircraft10 cantaxibackWards underitsoWn poWer. [0018] DepictedinFIG.1Aisoneembodimentofthe present invention, to Which there are alternative embodi ments. For example, one ormore ofpropulsion systems 14A 14DcanbelocatedWithinWings18A-18B.Foranother example, aircraft10 canhavemore lessthanormore thanfour propulsionsystems14.PDF Image | INTERNAL GAS TURBINE PROPULSION THRUST REVERSER
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