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NASA X-1s RESEARCH RESULTS ith a Selected Bibliography 4 NATIONAL AERONAUTICS AND SPACE ADMINISTRATION NASA SP-60 X-15 AL AERON A ON TI U CS TI AND SPA CE RESEARCH RESULTS With a Selected Bibliography By Wendell H. Stillwell M AD INISTRAT IO U.S.A. Scientific and Technical Information Division NATIONAL AERONAUTICS AND SPACE ADMINISTRATION 1 9 6 5 Washington, D.C. N NA For sale superintendent oF documents, u.s. Government printinG
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  NASA X-1s RESEARCHRESULTS ith a SelectedBibliography 4 NATIONALAERONAUTICSANDSPACEADMINISTRATION  X-15 RESEARCH RESULTS With a Selected Bibliography By Wendell H. Stillwell       N       A        T        I       O       N        A         L       A         E       R     O     N    A    U    T    I   C  S A N D  S  P   A  C    E    A    D     M     I            N        I                        S     T     R     A   T    I      O    N U  . S . A . Scientific and Technical Information Division  1 9 6 5 NATIONALAERONAUTICSANDSPACEADMINISTRATION Washington, D.C  . NASA SP-60  F or   sale   by    the s uperintendent   oF d ocuments , u.s. G overnment  p rintinG o FFice , W  ashinGton , d.c., 20402 - p rice 55 cents  F oreword I NAPERIODofalittlemorethansixtyyearssincethefirstflightoftheWrightBrothers,man’sexplorationofthree-dimen-sionalspaceabovethesurfaceoftheEarthhasextendedbeyondtheatmosphere.Spectacularandexcitingeventsinthisdramaticquesthavebeenwellpublicized.Behindthesemilestonesofpracticalflighthavebeenlesspublicizedachievementsinscientificresearch,makingsuchprogresspossible.AlthoughtheX–15hashaditsshareofnewsworthymilestones,itscontributionstoscientificresearchhave beenamoreessentialandmoremeaningfulpartoftheprogramfromitsinception.Thissemi-technicalsummaryoftheX–15programisdirectedtowardthelesspublicizedaspectsofitsachievements.Theyear1964marksthetenthanniversaryoftheinceptionoftheX–15flight-researchprogram,thefifthyearsincethefirstX–15flight.Whentheprogramwasfirstapproved,itsobjectiveswereclearlystatedintermsofaerodynamicheating,speed,altitude,sta- bility-and-controlresearch,andbioastronautics.Althoughtheseobjectiveshavebeenessentiallyaccomplished,itnowappearsthatthethreeX–15’smaybeflownforperhapsanotherfiveyears,inanewroleastestbedsforfreshexperimentsutilizingtheX–15per-formance,whichstilloffersmorethantwicethespeedandthreetimesthealtitudecapabilityofanyotheraircraftnowinexistence.Eventhoughtheprogramhasbeenmostsuccessfulintermsofachievingitsplannedobjectivesandiscontinuingtoplayanimpor-tantroleinaerospaceresearch,manynotablebenefitshavebeenofadifferentnature—moreintangibleandsomewhatunforeseenatthetimetheX–15programwasapproved.Intheearlyyearsofournation’sspaceprogram,whichhasbeenbasedtoalargeextentontheunmanned-missiletechnologythathadbeendevelopedoverthefiveyearspriortoProjectMercury,theX–15haskeptinproperperspectivetheroleofthepilotinfuturemannedspaceprograms.Ithaspointedthewaytosimplifiedoperationalconceptsthatshould iii
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