The NASA STI Program Office provides

Since its founding, NASA has been dedicated to the advancement of aeronautics and space

NASA/CR-1999-209527

Cg/StabilityMapfortheReferenceHCycle3Supersonic Transport Concept Along the

HighSpeedResearchBaselineMissionPro le

Daniel P. Giesy and David M. Christhilf

Lockheed Martin Engineering & Sciences Company, Hampton, Virginia

December 1999

Since its founding, NASA has been dedicated to the advancement of aeronautics and space

The NASA STI Program Office . . . in Profile

Since its founding, NASA has been dedicatedto the advancement of aeronautics and spacescience. The NASA Scientific and TechnicalInformation (STI) Program Office plays a keypart in helping NASA maintain thisimportant role.

The NASA STI Program Office is operated byLangley Research Center, the lead center forNASA’s scientific and technical information.The NASA STI Program Office providesaccess to the NASA STI Database, the

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TECHNICAL PUBLICATION. Reports ofcompleted research or a major significantphase of research that present the resultsof NASA programs and include extensivedata or theoretical analysis. Includescompilations of significant scientific andtechnical data and information deemedto be of continuing reference value. NASAcounterpart of peer-reviewed formalprofessional papers, but having lessstringent limitations on manuscriptlength and extent of graphicpresentations. TECHNICAL MEMORANDUM.

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seminars, or other meetings sponsored orco-sponsored by NASA. SPECIAL PUBLICATION. Scientific,technical, or historical information fromNASA programs, projects, and missions,often concerned with subjects havingsubstantial public interest. TECHNICAL TRANSLATION. English-language translations of foreign scientificand technical material pertinent toNASA’s mission.Specialized services that complement the

STI Program Office’s diverse offerings includecreating custom thesauri, building customizeddatabases, organizing and publishing

research results . . . even providing videos.For more information about the NASA STIProgram Office, see the following: Access the NASA STI Program HomePage athttp://www.sti.nasa.gov Email your question via the Internet tohelp@sti.nasa.gov Fax your question to the NASA STIHelp Desk at (301) 621-0134 Telephone the NASA STI Help Desk at(301) 621-0390 Write to:

NASA STI Help Desk

NASA Center for AeroSpace Information7121 Standard Drive

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Since its founding, NASA has been dedicated to the advancement of aeronautics and space

NASA/CR-1999-209527

Cg/Stability Map for the Reference H Cycle 3Supersonic Transport Concept Along the HighSpeed Research Baseline Mission Pro le

Daniel P. Giesy and David M. Christhilf

Lockheed Martin Engineering & Sciences Company, Hampton, Virginia

National Aeronautics andSpace AdministrationLangley Research Center

Hampton, Virginia 23681-2199

Prepared for Langley Research Centerunder Contract NAS1-96014

December 1999

Since its founding, NASA has been dedicated to the advancement of aeronautics and space

Available from:

NASA Center for AeroSpace Information (CASI)7121 Standard Drive

Hanover, MD 21076-1320(301) 621-0390

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Since its founding, NASA has been dedicated to the advancement of aeronautics and space

Abstract

AcomparisonismadebetweentheresultsoftrimmingaHighSpeedCivilTransport(H-SCT)conceptalongareferencemissionpro leusingtwotrimmodes.Onemodeusesthestabilator.Theothermodeusesforeandaftplacementofthecenterofgravity.Acomparisonismadeofthethrottlesettings(cruisesegments)orthetotalacceleration(ascentanddescentsegments)andofthedragcoef cient.Thecomparativestabilityoftrimmingusingthetwomodesisalsoassessedbycomparingthestabilitymarginsandtheplacementofthelateralandlongitudinaleigenvalues.

Introduction

ThestudyreportedinthisdocumentisafollowonstudytotheworkreportedbyChowdhry

andButtrillintheirmemorandum[1].Inthatreport,theydocumented“astudyperformedtoassessthebareairframestabilitycharacteristicsofaHSCTcon gurationandtoinvestigatethebene ts,ifany,ofusinganactivefuelmanagementsystemtoreducetrimdrag.”Thestudyconsistsoftrimmingtheaircraftateachpointalongareferencemissionpro le(1)holdingthex-cgatitsnominalpositionandusingthestabilatorand(2)holdingthestabilatoratzerode ectionandmovingthex-cgtotrim.Stabilityandperformancemeasuresoftheaircraftarecomparedatthetwotrimconditionsateachpointofthereferencemissionpro le.

Ref.[1]studiedtheReferenceH,cycle1HSCTconcept.Thepresentstudyusesthe

ReferenceHCycle3airplane(Ref.H-3)[2].

ReferenceMissionPro le

Thereferencemissionpro lewastakenfromaTCACon gurationDescriptionDocument

[3,pp.A32–A43].Itisdescribedbyasampleof79 ightconditionsdividedinto vesegments:Seg.1Climb,30 ightconditions(numbers1–30).

Seg.2Supersoniccruise,13 ightconditions(numbers31–43).Seg.3Supersonicdescent,16 ightconditions(numbers44–59).Seg.4Subsoniccruise,13 ightconditions(numbers60–72).Seg.5Subsonicdescent,7 ightconditions(numbers73–79).

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