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1、NASAFactsNationalAeronauticsandSpaceAdministrationDrydenFlightResearchCenterP.O.Box273Edwards,California93523Voice661-258-3449FAX661-258-3566pao@dfrc.nasa.govFS-1999-12-047DFRCTHELOCKHEEDYF-12YF-12inflight.(NASAphotoEC72-3150)TheYF-12ÒBlackbirdÓwasanexperimentalfighter-interceptorvers
2、ionoftheLockheedA-12reconnaissanceaircraft.InAirForceflighttestsonMay1,1965,theYF-12setaspeedrecordof2,070.101mphandanaltituderecordof80,257.65feet.FirstpubliclydisplayedatEdwardsAirForceBasein1964,theYF-12wasneveradoptedbythemilitaryasanoperationalaircraft.Itwas,however,aprecursortot
3、heSR-71Blackbirdreconnaissanceplane.TwoYF-12ÕswereflowninajointAirForce-NASAresearchprogramattheNASAFlightResearchCenter(after1976,theNASADrydenFlightResearchCenter)between1969and1979.Athirdsharedplane,pilotedprimarilybytheAirForce,waslosttoanin-flightfirein1971.TheYF-12allowedNASAres
4、earchersatallfouroftheagencyÕsaeronauticalcenters(Langley,Lewis[nowGlenn],andAmesaswellastheFlightResearchCenter)tostudythethermal,structural,andaerodynamiceffectsofsustained,high-altitude,Mach3flight.Paintedflatblack,theYF-12wasfabricatedprimarilyfromLockheedwasalsodevelopingÒalong-r
5、angeadvancedtitaniumalloy,whichenabledittowithstandskintempera-strategicreconnaissanceplaneformilitaryuse,capableofturesofover500¼F.world-widereconnaissanceformilitaryoperations.ÓThatplane,theSR-71,wasamodifiedversionoftheYF-12.WorkontheYF-12beganinsecretinthelate1950ÕsattheAlthoughhe
6、avierthantheYF-12,theSR-71ÒspyplaneÓLockheedAdvancedDevelopmentProjectsoffice,betterashadalongerrangeandwascapableofstrategicsurveil-knowntheÒSkunkWorks,ÓinBurbank,CA.Flightdatalance.ThisspyplanewasadoptedbythemilitaryandtheremainedclassifiedlongafterPresidentLyndonJohnsonYF-12wasnot.
7、UsurpedbyademandforitssuccessorÕsannouncedtheplaneÕsexistenceonFeb.29,1964.Aftercapabilities,theexperimentalYF-12Õswereessentiallytheannouncement,theplanereceivedtheAirForcedesig-shelveduntil1969,whentwoofthemweredeployedasnationYF-12A.researchvehiclesattheNASAFlightResearchCenter.(Th
8、eÒSku
