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Location: Home > ask a rocket scientist > conspiracy > q0265 Search Pentagon & Boeing 757 Engine Investigation I've seen pictures of engine wreckage at the Pentagon after 9/11. Your site says the engine of a 757 is over 6 feet across but this piece is way smaller than that. Does it prove that whatever hit the Pentagon was not a 757 and the government is lying about it? question from Leroy Mulligan The page you refer to discusses the diameter of the engines used aboard the Boeing 757 . What is not explicitly stated in that article is that the dimensions discussed refer only to the maximum diameter of the engine and not the widths of the various components within. Schematic of a simple jet engine In order to better understand the parts of a jet engine and how this form of propulsion works, let us briefly revisit the different types of jet engines . The earliest form of jet propulsion was the turbojet . This type of powerplant employs a series of compressor blades mounted on rotating disks that squeeze incoming air to a higher pressure and temperature. The compressed air is then mixed with fuel and ignited. The high temperature air passes through another series of rotating blades called a turbine, which causes this turbine to spin. The turbine rotors are attached to a central shaft running the length of the engine, so the turbine's

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  • 5/15/2015 Aerospaceweb.org | Ask Us - Pentagon & Boeing 757 Engine Investigation

    http://www.aerospaceweb.org/question/conspiracy/q0265.shtml 1/18

    Location:Home>askarocketscientist>conspiracy>q0265 Search

    Pentagon&Boeing757EngineInvestigation

    I'veseenpicturesofenginewreckageatthePentagonafter9/11.Yoursitesaystheengineofa757isover6feetacrossbutthispieceiswaysmallerthanthat.DoesitprovethatwhateverhitthePentagonwasnota757andthegovernmentislyingaboutit?questionfromLeroyMulligan

    ThepageyourefertodiscussesthediameteroftheenginesusedaboardtheBoeing757.Whatisnotexplicitlystatedinthatarticleisthatthedimensionsdiscussedreferonlytothemaximumdiameteroftheengineandnotthewidthsofthevariouscomponentswithin.

    Schematicofasimplejetengine

    Inordertobetterunderstandthepartsofajetengineandhowthisformofpropulsionworks,letusbrieflyrevisitthedifferenttypesofjetengines.Theearliestformofjetpropulsionwastheturbojet.Thistypeofpowerplantemploysaseriesofcompressorbladesmountedonrotatingdisksthatsqueezeincomingairtoahigherpressureandtemperature.Thecompressedairisthenmixedwithfuelandignited.Thehightemperatureairpassesthroughanotherseriesofrotatingbladescalledaturbine,whichcausesthisturbinetospin.Theturbinerotorsareattachedtoacentralshaftrunningthelengthoftheengine,sotheturbine's

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    spinningmotioncausesthisshafttorotateaswell.Alsoattachedtothesamecentralshaftisthecompressorsectionatthefrontoftheengine.Thisconnectionbetweentheturbineandcompressorsectionscausesthecompressorstagestocontinuespinning,bringinginadditionalairtokeeptheenginefunctioninginarepeatingcycle.Oncetheairflowmovespasttheturbines,itisexhaustedthroughanozzle.Theexpansionofthehighpressuregasesagainstthenozzlewallscreatesthrustthatpushestheengineforward,aswellasthevehicleitisattachedto.

    Anothertypeofjetthatissimilartobutmoreefficientthantheturbojetistheturbofan.Aturbofanusesthesamecomponentsdescribedabovewiththeadditionofalargefaninfrontofthecompressorsection.Thisfanisconnectedtothesamecentralshaftthatturnsthecompressorbladessothatthefanalsorotates.Asitdoesso,thefanacceleratesawidecolumnofairtofurtherincreasethrust.Airpassingthroughthecenterportionofthefanentersthecompressorwhereitmovesthroughthecoreoftheenginejustlikeonatypicalturbojet.Airacceleratedthroughthefan'souterdiameter,however,flowsaroundtheenginecorewithoutpassingthroughit.Thisprocesscanbebetterunderstoodbystudyingananimationofairflowthroughaturbofan.

    Therearetwobasictypesofturbofansthataredifferentiatedbytherelativeamountofairthatflowsthroughthefanandaroundtheenginecoreversustheamountofairthatflowsthroughthecoreitself.Aturbofanwithalowbypassratiomeansthatmostoftheairflowingthroughtheenginepassesthroughtheturbojetcoreandverylittlethroughtheouterfanbypassduct.Suchenginesaremostcommononmilitarycombataircraftlikefighters.Today'scommercialairlines,likethe757,areinsteadfittedwithhighbypassturbofanengines.Ahighbypassturbofanconsistsofaverylargediameterfanandamuchsmallerdiameterturbojetcorewithin.

    Comparisonofalowbypassturbofanwithlongductsandahighbypassturbofanwithshortducts

    Asshownintheabovediagram,aturbofancontainsmanyrotatingcompressorandturbine

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    disks,allofwhicharesmallerthanthefanatthefrontoftheengine.Therotarycomponentswithinahighbypassturbofan,inparticular,areoftenonlyasmallfractionofthefandiameter.Mostspecificationsdescribingtheoverallsizeofanenginewilllistthefandiametersincethismeasurementdefinestheengine'smaximumwidth.Ourearlierarticleaboutthe757usesthisdimensiontocomparethediameteroftheenginenacelletothatofthefuselage.

    Withthatintroductionaside,let'stakeacloserlookatthespecificquestionofdebrisfoundatthePentagonfollowingtheattackon11September2001.Whileresearchingthistopic,wecameacrossmanywebsitesclaimingthatitwasnotAmericanAirlinesFlight77thatwashijackedandpurposefullycrashedintothePentagonduringtheterroristattackthatmorning.Theauthorsofthesesitesinsteadbelievethatanyofavarietyofmilitaryaircraft,cruisemissiles,orotherweaponswereusedbytheUSgovernmenttoattackthePentagon,andthestoriesofterroristhijackingsweresimplyacoverupforthesinisterscheme.

    AmericanAirlinesBoeing757200withtailnumberN644AA

    Accordingtotheacceptedstory,AmericanAirlinesFlight77washijackedbyfivealQaedaterroristsasitwastravelingfromWashingtonDCtoLosAngeles.TheaircraftinvolvedinthishijackingwasaBoeingModel757200withtheBoeingcustomercode757223andtheregistrationnumberN644AA.ThissameaircraftispicturedaboveinaphototakenatLoganInternationalAirportinBostonon7August2001.TheterroristssteeredtheplaneintothewestsideofthePentagonkilling59passengersandcrewaswellas125victimsontheground.

    ThosewhodoubtthisversionofeventspointtowreckageatthePentagonasproofthatsomeotherkindofaircraftormissilewasactuallyresponsiblefortheattack.Probablytheonepieceofdebristhathaspromptedthemostdebateisthefollowingphotoofwhatlookslikearotarydiskfromtheinterioroftheplane'sengine.Thisdiskcouldbepartofafan,acompressor,oraturbinerotorfrominsidetheengine,butthebladesarenotpresentandwerepresumablyknockedoffintheimpact.

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    RotatingenginediskvisibleatthePentagon

    CloseupviewsofthePentagonenginecomponent

    Basedonthesizesofthepersonstandingnexttothedebrisandotherobjectsinthephotographsthatwecanuseforcomparison,ithasbeenestimatedthatthediskisapproximately25to30inches(63.5to76.2cm)across.Obviously,thispieceisfarsmallerthanthemaximumenginediameterof6feet(1.8m)ormoreleadingmanytodrawtheconclusionthattheitemisnotfroma757engine.ThatconjecturecausesconspiracytheoriststobelievethatamuchsmallervehiclemusthavestruckthePentagoninstead.

    However,wehavealreadyseenthatrotatingcomponentswithinaturbofanenginecanvarywidelyinsize.Inordertodeterminewhetherthiscomponentcouldhavepossiblycomefroma757,weneedtotakeacloserlookattheengineinstalledaboardtheaircraftregisteredN644AA.Boeingofferedtwodifferentengineoptionstocustomersofthe757200.AirlinescouldchoosebetweenthePratt&WhitneyPW2000familyortheRollsRoyceRB211series.

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    TheparticularenginemodelchosenbyAmericanAirlinesforits757fleetwastheRB211535E4BtripleshaftturbofanmanufacturedintheUnitedKingdom.Adrawingillustratingtheoverallsizeofthisengineispicturedbelow.

    DiagramoftheRollsRoyceRB211535turbofan

    Notetherelativesizesoftheforwardportionofthisenginecomparedtothecentralcore.Clearly,thesectionhousingthefanismuchwiderthantheturbojetcorethatcontainsthecompressorandturbinecomponents.WecangetaclearerviewoftherelativesizesofcomponentswithinthisengineinthefollowingcutawaydrawingoftheRB211535.

    CutawayoftheRollsRoyceRB211535turbofan

    UsingtheseimagesandotherdiagramsoftheRB211535engine,wecanobtainapproximatedimensionsoftheengine'srotarydisksforcomparisontotheitemfoundinthe

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    Pentagonrubble.Ourbestestimateisthattheengine'stwelvecompressordiskhubs(withoutbladesattached)areabout36%thewidthofthefan.Thefiveturbinediskhubsappeartobeslightlysmalleratapproximately34%thefandiameter.AccordingtoBrassey'sWorldAircraft&SystemsDirectoryandJane's,thefandiameteroftheRB211535E4Bengineis74.5inches(189.2cm).Itthenfollowsthatthecompressordiskhubsareapproximately27inches(69cm)acrosswhiletheturbinediskhubsareabout25inches(63.5cm)indiameter.BothofthesedimensionsfitwithintherangeofvaluesestimatedfortheenginecomponentpicturedinthewreckageatthePentagon.

    Wecantakethisanalysisastepfurtherbyalsoexploringsomeofthealternatetheoriesthathavebeenputforwardbythosebelievingthisobjectcomesfromadifferentaircraft.TwoofthemostcommonclaimswehaveseensuggestthattheplaneusedintheattackwasaDouglasA3SkywarriororaNorthropGrummanRQ4GlobalHawk.TheA3isanairbornejammingaircraftoriginallyorderedbytheUSNavyduringthe1950s.ThetypeisnowretiredfromfrontlineservicethoughahandfularestillusedfortestingpurposesbythedefensecontractorRaytheon.TheGlobalHawkisanunmannedaerialvehicleusedbytheAirForceforreconnaissancemissions.Neitheroftheseplanesbearsmorethanasuperficialresemblancetothe757,butwewillacceptthepossibilitythattheycouldbemistakenforacommercialairlinergiventheconfusiononSeptember11.

    Forthesakeofthisinvestigation,theonlyissueweshallconsideristheenginesthatpowerbothplanes.TheA3wasequippedwithtwoPratt&WhitneyJ57turbojetslikethatpicturedbelow.TheJ57datestotheearly1950sandisratherantiquatedbytoday'sstandards.

    Pratt&WhitneyJ57turbojet

    Forsomereason,mostoftheconspiratorialsitesinsteadmakeextensivereferencetotheA3beingpoweredbyaPratt&WhitneyJT8Dengine.Moreover,thesesitesclaimthattheJT8Disaturbojet.TheJT8Disactuallyalowbypassturbofanthatwasdevelopedforuseaboardcommercialaircraftlikethe727and737.WehavenotfoundanysourcethatindicatestheJT8DwaseverusedontheA3Skywarrior,soitisunclearwhytheoriginatorsoftheA3theoryaresoinfatuatedwiththisparticularpowerplant.Nevertheless,wewillincludeitinourinvestigationforcompleteness.

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    Pratt&WhitneyJT8Dturbofan

    TheGlobalHawk,meanwhile,ispoweredbyasingleRollsRoyceAE3007Hturbofan.TheAE3007isbuiltbytheAllisonEnginedivisionofRollsRoycelocatedinIndianapolis,Indiana.

    RollsRoyceAE3007turbofan

    Usingphotosandcutawaydrawingsofthesethreeengines,wecanestimatethediametersofthecompressorandturbinerotorhubsjustaswedidfortheRB211.WhilethecompressorandturbinedisksontheJ57andJT8DarelargerbypercentagethanthoseoftheRB211,themaximumdiametersofallthreeenginesareconsiderablysmallerassummarizedinthefollowingtable.

    Engine OverallDiameter CompressorHubDiameter(estimated)TurbineHubDiameter

    (estimated)PWJ57 40.5in(102.9cm) 16in(40.6cm) 18in(45.7cm)PWJT8D 49.2in(125cm) 21.5in(54.6cm) 22.5in(57.1cm)

  • 5/15/2015 Aerospaceweb.org | Ask Us - Pentagon & Boeing 757 Engine Investigation

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    RRAE3007H 43.5in(110.5cm) 14in(35.6cm) 15in(38.1cm)

    ThisanalysisindicatesthatallthreeoftheseenginesaretoosmalltomatchtheenginecomponentphotographedatthePentagon.Somesitesalsosuggestthepartmightbefromtheaircraft'sauxiliarypowerunit(APU).AnAPUisessentiallyasmalljetenginemountedinthetailofanaircraftthatprovidesadditionalpower,particularlyduringanemergency.However,APUstendtobemuchsmallerthanjetengines,andthecomponentpicturedatthePentagonistoolargetomatchanyfoundinanAPU.IthasalsobeensuggestedthattheattackwasconductedbyacruisemissileliketheTomahawkorStormShadow,buttheseandotherweaponsarepoweredbyenginesnomorethan15inches(38cm)across.ThesepowerplantsareobviouslyfartoosmalltoaccountforthePentagonwreckage.

    Whateverpiecethisis,itappearstobeonlythecentralhubofacompressororturbinestage.Normally,eachoftheserotatingstageswouldbefittedwithseveralcurvedbladesmountedalongitscircumference.Thesebladeswereapparentlyknockedofftherotorhubfoundinthewreckageduetotheforceoftheimpact.Thelossofthesebladesisunfortunatesincedifferentmanufacturersoftenadoptuniqueshapesfortheirfan,compressor,andturbinebladesthatwouldmakethesourceofthecomponentmucheasiertoidentify.Nonetheless,wehavebeenabletolocatethefollowingpictureoftheintermediatepressurecompressorsectionoftheRB211thatappearstomatchseveralcharacteristicsofthePentagondebris.NotethatthisphotoappearstobefromtheRB211524whichisanupratedrelativeoftheRB211535usedontheBoeing747and767.ThisenginemodelcontainssevenintermediatepressurecompressorstagescomparedtothesixoftheRB211535.However,thecompressordisksusedonbothenginesarebelievedtobenearlyidentical.

    ComparisonofintermediatepressurecompressorstagesontheRB211tothewreckage

    OnesimilaritybetweenthetwophotoscanbeseeninthecleatsalongtheedgeofthePentagonobject.Thesedevicesarecalleddovetailslotsandprovideattachmentpointsforthecompressorblades.TheshapesoftheseslotsonthePentagonwreckageappeartomatchthoseontheRB211assemblyshownontheleft.Furthermore,the"nosepiece"juttingoutfromthecenterofthediskinthePentagonphotosharescommonalitieswiththecentralshaftvisibleintheRB211photo.

    TheaboveanalysisindicatesthatthePentagondebrisdoesinfactmatchthecharacteristicsofarotordiskfromtheRollsRoyceRB211535.Thewreckageismostlikelyacompressorstagegiventheshapeofthedovetailslots.Itisdifficulttobecertainexactlywhich

  • 5/15/2015 Aerospaceweb.org | Ask Us - Pentagon & Boeing 757 Engine Investigation

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    compressordiskitissincethesixrotorsoftheintermediatepressuresectionandsixhighpressurecompressordisksareofsimilarsize.Theprimarydifferencefromonecompressortothenextisthesmallerspanofthecompressorbladesastheairflowsfurtherintotheengine,butthesebladesarenolongerattachedtothewreckage.However,additionalcluesinthephotosuggesttherotordiskisprobablyfromthehighpressuresectionorperhapstheverylastdiskoftheintermediatepressurecompressors.

    Webelievethediskismostlikelyahighpressurecompressorbecauseoftheshapeofthepiecejuttingfromitscenter.Thisitemispartofthecentralshaftthatrunsthelengthoftheenginetoconnecttherotatingstagesofthefan,compressor,andturbine.TheRB211isdescribedasatripleshaftortriplespoolturbofansinceitusesthreeconcentricshaftstodrivethevariousrotatingelementsoftheengine.Theseshaftsaredifferentiatedbytherelativepressureofthegasespassingthroughtherotorstagesattachedtothem.Thelongestshaftwiththesmallestdiameterlocatedclosesttothecenterlineconnectsthelowpressure(LP)enginecomponents.ThisshaftisrotatedbytheLPturbines,locatedjustaheadofthenozzle,anddrivesthelargefanatthefrontoftheengine.

    RB211schematicillustratingthelow,intermediate,andhighpressureshafts

    TheLPshaftrotateswithinashorter,largerdiametershaftthatdrivestheintermediatepressure(IP)system.ThisshaftrotatesatahigherrateandconnectstheIPturbinestagetothesixIPcompressordisks.Thethirdconcentricshaftistheshortestwiththelargestdiameterandhighestrateofrotationtodrivetheengine'shighpressure(HP)system.ThisshaftconnectstheHPturbinetothesixHPcompressors.ThedebrisphotographedatthePentagonappearstobeconnectedtothreeconcentricshaftsofincreasingdiameter,suggestingthatitmostlikelycomesfromthehighpressuresystemofatriplespoolturbofanliketheRB211535.

    Alternatively,thisdiskcouldbethelastoftheintermediatepressurecompressorrotorsandthelargerdiametershaftweseemightbethestartoftheshaftonwhichthehighpressurecompressorsaremounted.Ifaphotooftheoppositesideofthediskwereavailable,itshouldbeeasiertotellexactlywhichsectionofcompressorsitcomesfrom.Nevertheless,

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    theevidencedocumentedaboveclearlyshowsthatthesizeandshapeofthisdebrisisconsistentwiththeRB211turbofancarriedbya757butnotsowithenginesusedaboardsmalleraircraftandmissiles.

    Sincethisarticlewasfirstpublished,wehavereceivedseveralcommentsfromreaderscitingaquotefromRollsRoycespokesmanJohnW.Brownwhosaid,"ItisnotapartfromanyRollsRoyceenginethatI'mfamiliarwith..."ThecriticsgoontosuggestthatthisstatementdisprovesallofouranalysisindicatingthediskisacompressorstagefromtheRollsRoyceRB211535.However,asimplereviewofthesourceofthisquoteshowsjusttheopposite.Thematerialisfromanarticletitled"ControversySwirlingOverSeptember11PentagonMystery:IndustryExpertsCan'tExplainPhotoEvidence"writtenbyChristopherBollynthatappearedontheproconspiracywebsiteAmericanFreePress.

    ThearticledescribesJohnBrownasaspokesmanforRollsRoyceinIndianapolis,Indiana.ThislocationishometotheAllisonEnginefactorythatbuildstheAE3007HturbofanusedaboardtheGlobalHawk.Brown'squoteregardingthemysterywreckagestatesthat,"ItisnotapartfromanyRollsRoyceenginethatI'mfamiliarwith,andcertainlynottheAE3007HmadehereinIndy."Furthermore,thearticlecorrectlynotesthattheRB211isnotbuiltinIndianapolisbutattheRollsRoyceplantinDerby,England.SinceBrownisaspokesmanforAllisonEngines,whichwasanindependentcompanythatonlybecameasubsidaryofRollsRoycein1995,itstandstoreasonthatanenginebuiltintheUnitedKingdomwouldbeonehe'snot"familiarwith."ThearticleevengoesontopointoutthatBrowncouldnotidentifyspecificpartsfromoneengineoranothersinceheisnotanengineerorassemblylinetechnicianwhowouldbefamiliarwiththeinternalcomponentsofturbineengines.

    Forwhatit'sworth(anditisn'tworthmuch,giventheauthor'sapparentlackofjournalisticskill),theBollynarticleactuallysupportstheevidenceassembledonthissite.ThearticleprovidesquotesfromHoneywellAerospaceindicatingthatthepiecedidnotcomefromanAPU,fromAllisonEnginessuggestingthatitisnotacomponentfoundintheturbofanusedonGlobalHawk,andfromTeledyneContinentalMotorsindicatingthatitisnotpartofacruisemissileengine.Alloftheseconclusionsmatchthoseexplainedabove.

    PerhapsanevenmoreconclusivepieceofwreckagewasfoundamongotherdebrisphotographedatthePentagonfollowingtheimpact.ThecomponentshownbelowhasappearedonseveralconspiracytheorywebsitesclaimingthatitdoesnotmatchanyknowncomponentoftheRB211andmustcomefromadifferenttypeofengine.

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    AnotherpieceofenginedebrisfoundatthePentagon

    Thisitemappearstobepartofthecasingofthecombustionsection.Thisportionofajetengineislocatedaftofthecompressors,anditisherethatthehighpressureairismixedwithfuelandignited.Thecircumferenceofthiscircularcasingcontainsseveralholesthroughwhichfuelinjectorsspraythejetfuelneededforcombustion.Thenumber,size,andshapeofthesenozzleholesisgenerallyuniquetoaparticularenginetypeandcanbeusedtoidentifytheenginemodelitcomesfrom.Basedonthecurvatureofthedebris,thepieceshownhereappearstobeabouthalfofthetotalcombustorcase.Wecancountsixnozzleportsalongitscircumferencefromtheregionnearesttheflooraroundtothetop,whichrepresentsaboutonethirdofthetotalcase.Wecanalsoseesixscrewholesalongthecircumferenceofeachnozzleportthatareusedtoattachthefuelinjectors.

    ThebestphotoswehavefoundillustratingthedesignofthispartontheRB211535seriesenginecomefromtheBoeing757maintenancemanual.AdiagramfromthismanualshownbelowillustratescomponentsoftheRB211535highpressuresystemanditslocationrelativetotherestoftheengine.

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    ComponentsoftheRB211535illustratedinthe757maintenancemanual

    Anevenbettercloseupviewofthecombustioncaseisprovidedbelow.Notetheoveralldesignpatternofthefuelinjectorportsincludingtheshapeoftheholes,thespacingbetweenthem,andtheirrelativesizescomparedtothediameterofthecaseitself.Alsonotethelocationsofthesixscrewholesaroundthecircumferenceofeachnozzleport.Therealsoappeartobeatotalof18injectorholesaroundthecircumferenceofthiscasing,andsixoftheseholescanbefoundoveronethirdofthecasediameter.AllofthesemeasurementsmatchupperfectlytothePentagonphoto.

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    RB211535combustionoutercase

    Insummary,wehavestudiedtwokeypiecesofwreckagephotographedatthePentagonshortlyafterSeptember11andfoundthemtobeentirelyconsistentwiththeRollsRoyceRB211535turbofanenginefoundonaBoeing757operatedbyAmericanAirlines.ThecircularenginediskdebrisisjusttherightsizeandshapetomatchthecompressorstagesoftheRB211,anditalsoshowsevidenceofbeingattachedtoatripleshaftturbofanliketheRB211.WhilemanyhaveclaimedthewreckageinsteadcomesfromaJT8DorAE3007Hturbofan,wehaveshownthattheseenginesaretoosmalltomatchthedebris.Furthermore,wehavestudiedwhatclearlylooksliketheoutershellofacombustioncaseandfoundthatitsfuelinjectornozzleportsmatchupexactlytothoseillustratedinBoeingdocumentationfortheRB211535engine.ThereissimplynoevidencetosuggesttheseitemscamefromanyotherenginemodelthantheRB211535,andthevastmajorityoftheseenginesareonlyusedononetypeofplanetheBoeing757.

    Nonetheless,thevarioussiteswehavediscoveredoverthecourseofansweringthisquestionraiseanumberofotherquestionsaboutpiecesofwreckagefoundatthecrashsite.Whilethisarticlefocusedonlyontheenginedebrisaskedaboutintheoriginalquestion,wemayrevisitthissubjectinthefuturetobetterexploretheclaimsofaPentagoncoverupfollowingSeptember11.answerbyJoeYoonanswerbyJeffScott,12March2006

    Update!

    Onecommonquestionwe'veseenonsitescriticalofaBoeing757strikingthePentagoniswhyistheresolittleenginewreckage.Theonlyidentifiableenginecomponentsseensofar

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    arethetwodiscussedabove.Sincethesepiecesrepresentsolittleofthetwolargeenginescarriedbya757,thosebelievinginconspiracysuggestthatthesesmallitemswereplantedandthelackofmoresubstantialdebrisisproofofacoverup.Ifa757trulyhitthePentagon,theyargue,thenwhereistherestofthetwoengines?Thisargumentignoresthesimplefactthatalackofphotosofotherenginepartsdoesnotmeanthatnoneexisted,onlythatotherenginecomponentswereeithernotphotographedorthephotoshavenotyetbeenreleased.

    Luckily,severalreadershavepointedoutanadditionalpicturethatwasreleasedasanexhibitduringtheZacariasMoussaouiterroristtrialin2006.Thisphoto,shownbelow,clearlyincludesasizeableandrelativelyintactportionofagasturbineengine.

    PieceofenginedebrisphotographedatthePentagon

    Thisdebrisappearstocontaintworotatingenginediskswithpartoftheengine'scentralshaftprotrudingforward.Behindthetwodisksisanothercomponentcalledaframe.Framesarefixed,nonrotatingcomponentsthatprovideattachmentpointsholdingtheenginetogether.Thisdebrismustcomefromtheaftsectionofanenginegiventheshapeofthebladeattachmentpointsvisblealongthecircumferenceofthetworotatingdisks.Theseattachmentshaveahighlycambered,orcurved,bananalikeshapeindicativeofthebladesusedintheturbinesectionofajetengine.Thebladesusedonfanandcompressorstages,bycomparison,haveamuchstraighterandlesscurvedshape.

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    Closerviewoftheturbinesectiondebris

    TheRB211535engineusedonthe757containsfiveturbinedisksthreelowpressureturbinesthatpowerthefan,oneintermediatepressureturbinedrivingtheintermediatepressurecompressors,andonehighpressureturbinethatturnsthehighpressurecompressors.Thedebrisshownherecontainstwoofthethreelowpressureturbinesandpossiblytheremainsofthethird.Theprotrudingshaftalsoappearstobecomposedoftwoseparateshaftsofdifferingdiameter.Asmallportionoftheinnershaft,fromtheengine'slowpressuresystem,appearstoprotrudefrominsideasecondlargerdiametershaftsurroundingit.Thislargerdiametershaftcorrespondstotheintermediatepressuresystemandwouldconnecttoanadditionalturbinediskthatisnolongerattached.

    ThoughitisdifficulttoconclusivelyidentifythesecomponentsaspartofanRB211535enginewithoutbetterpicturesofanintactengineforcomparison,perhapsthemostidentifiableobjectshownindebrisistheaftframe.Alongthecircumferenceofthisframeareseveralfixedbladescalledstatorsthathelpguidetheairasitflowsthroughtheengine.Wecanseetheremainsoffourofthesestatorsinthephotooveraboutathirdofitsdiameter.

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    CutawaydiagramoftheRB211535fittedtoaBoeing757

    TheaboveillustrationfromRollsRoyceshowsanothercutawayoftheRB211535thatprovidesagoodviewoftheinternalcomponentsoftheengine.Inparticular,notetheframejustaftoftheturbinestages.ThespacingofthestatorvanesshownherematchesthoseseeninthePentagonphotowellandprovidesadditionalevidencethatthedebrisisinfactfromanRB211engine.

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    RB211highpressuresystemcontainingsixcompressordisks,combustors,andaturbinedisk

    Togiveabetterideaofhowthethreeenginecomponentswehavediscussedrelatetooneanother,theaboveimageshowsadiagramofthehighpressuresystemwithintheRB211535engine.AlsoincludedaretheobjectsidentifiedinthePentagonwreckageandtheirrelativelocationswithintheengine.Asdiscussedinthemainarticle,allthreeofthesepiecesofdebrisareidenticalmatchestooratleastconsistentwiththecomponentsfoundintheRollsRoyceRB211535turbofanaboardaBoeing757.answerbyJeffScott,6May2006

    RelatedTopics:

    I'vereadthatthewheelphotographedatthePentagondoesn'tmatchaBoeing757.Ithaseightholesinitbutthewheelona757hastenholes....LookatthesepicturesoflandinggearfromthecrashatthePentagonanda757.TheyPROVEa757didn'thitthePentagon!

    Intheaftermathof9/11,Ihaveheardmanyclaimsthata757couldnotpossiblehavehitthePentagonbecausetheplanecannotflysolowtothegroundsincegroundeffectpreventsthisfromhappening.Isthereanytruthtothisclaim?...Idon'tthinkanypilotcouldcontrolanaircraftlikethatandhitthePentagon.No757couldflylikethat,especiallytheterroristsupposedlyflyingFlight11whowasanunskilledamateurpilotyetmagicallyflewwithtotalperfection.

    IheardabigplanehittheEmpireStateBuildinginWorldWarII.Whydidn'ttheskyscrapercollapseliketheWorldTradeCenterdid?

  • 5/15/2015 Aerospaceweb.org | Ask Us - Pentagon & Boeing 757 Engine Investigation

    http://www.aerospaceweb.org/question/conspiracy/q0265.shtml 18/18

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