1、1!,.,. , Illlfll;lllllillllllllilnlillll3 117600I0i9224-”“ - a -.H-.-”-.-#,-7 -sNATIONALADVISORyiOMMITTEi “-FORAERONAUTICS15 m ?947 dTECHNICALNOTENo. 1468.-. LOW-SPEEDSTATICSTABILITYANDDAMPING-IN-ROLLC!HARACTERX3TICSOFSOMESWEPTANDUNSWEPTLOW-ASPECT-RATIOWINGSByLouisP. ToSti. .LarwlevMemorialAeronauti
2、calLaboratory.- LangleyField,Va.WashingtonOctober1947. ,._,= . _. .=,w-. -.- -=. _- ._, ._.- - . .,-+.-.+“+-.- -5, - .-.LANGLEYMEMORIALAQONAUTICtia71 LAWXMT(3EYProvided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-/i -.-:. IW.TIONALAmIsmYCcm4mTmFORAERONAUT
3、ICSTK2WCW”ioii!liO.c1468 -.L., .LOW-SPEEDSTATICSTABXHTYANDDAMPING-IN-ROLLCHPJUCTERISTIC!SOFSOMESWEPTAND, UNSWEPTLOW-ASPECT-TLATXOWINGS r-ByLotisP.Tosti .,SUMMARYAninvestigationatlowspeedtodeterminethestaticstabilityanddamping-in-rollcharacterietisofnuatmroflow-as-pect-ratio. wingsticlwMngsweptwingso
4、fqprox5mat63whereasthetriangularandpt t8red-S h nerdshowedareductionofdampinginpollwithincreasingU,ftcoefficientandfilsou casesbecameunstablebeforemsximmliftwasreached.Thedampinginrolldecreasedaexpectedwithaspectratio.3Xperi-mmte,lvaluesofthem%Iricl.udedforcomparison.Ml.forceHandnomentswhicharedefl-
5、nedi.nfigureWOi6ref erridtO1. !L1X3rollfn!g,thestabilityaxas- “yawti,andpttchinaerodynamic.chord.hcorrooi.ons”forthepffectsoftheJetbounfeetchord,feetmeanaerodynamicchord,feet,W=)rmt chord,feettipchord,feetM Of SWOEICliofquarter-chordMne ofwing,degreestaperratio (+J.-,.angleof.attack,deglxmsangl.9. o
6、f., y-ax, degree a ,.-Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-IVACA-TNNOc1468baspectratio()-5-()Id.ftlliftcoefficient0Dragdragcoefficient_Cpitchti.rymontcoefi%ciertrolling-momentcoefficient(-Roll)molllent(?+:3yawing-momntcoefficient-.rolltnga
7、ngularvelocity,radianspersecondrolling-anlar-velocityfactorofhelixanEJegemrated%ywingttpinroll,radiansrateofchangeofrolling-momentcoefficientwithrofii-a71acl.0angular-vqlocityfactorgrateofchangesideslipinrateofchangesideslipinofrolling-momentcoefficientwithangleofP) tdegreesofyawing-mortmxbooef*fici
8、en*withangleofde-es r)$“()*lift -curveslopeaiL -.Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-4 .Foroeanddamping-in-rolltowttiwere”madeoneachcfthe18w-describedintable1. InordertofailttatotheW3.Wcons”bruc+d.on,mostofthelow-aspect-ratiowiri,gswereof
9、flat-plateairfoilsoction,foryastexperiencehasshownthata%lowasstYatiostapproximak”o1?orless)thechoioeofairfoilshaslittleeffectontheaerodynamiccharacteristicsof.=wtig.Theometricdihedralofthomoanthiclmeaslinewaszeroforallofthewingsexceptwings4and6,.-whichhad-0.6end-19dihedral,”m electively.Theforcetest
10、sweremadeonthesix-componentTala.nceoftheLangleyfree-flittunnel,Foracomplbtebmn?iptlonof*hobalanceandtunnelseereferences2and3,respective.y.) Thetestsconsistidofmeasurementsthroughar- ofazieofattackfromsmallnoativeanglesthrough“theangleofmaxiru.igMftwithemglmsofyawof0,“,L3.M-”.:JTm.valuesoftheIatel%l.
11、stabilityderivatims-Clp U Cq weredetorm1A.ect ., -, .,.” r.,.-,- -I- .-.Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-NACATNNO.1468RElmuLNms1.Zimmerman,C.II.:CharacteristicsofClarkYAirfoilsofSmallAspectRatfcm.NACARep.No.431,1932.2,3.4*5*6,.8.9910.S
12、hortal.,JosephA.,endIlrapeP,JohnW.: Free-Flight-TunnelInvestigationoftheEffeetoftheFuselageLengthandtheAsyectRatioendd3zeoftheVerttc”alTailonLateralStabilityandControl.NACAARRNo,3D17,2943.Shortal.,JosephA.,andOsterhout,ClaytonJ.: PreliminaryStahilltyandControlTeeteintheNACAFree-FlightWindTunnelandCo
13、rrelationwithFull.-ScaleFlightTests.NACAINNo.810,1941a71Zitierman,C,H+: PreliminaryTestsintheN.A.CCA,Free-SpinningWindTunnel.NACARep.No.557,1936.Bennett,Ch-arlesV.,andJohnson,JoeephL,: ExperimentalDeterminationoftheDampinginRollendAiLeronl?oX1.ingEffectiveness.ofTheeWingsEaving2,42,and62Sweepback.NA
14、CATNNo.1.278,1947.LangeandWacke:PrllfberichtUber3-und6-KomponentenmessungenenderZuspitzungoreihevonFlllgelnkleinerSt.recg.Teilberi.cht:llreleckflel.UMNr.1023/5,DeutscheLuftfahrtforschung(B6rlin-Al,dershof),1943.(AvailableagNACA No.u76.)Swanson,RobertS*andCrandall,Stews D 300 .5 Q9 Q 1.00.K o/0 o .50
15、5 0II A ,.3.00 0 449/? A go o 56.313 A /.00 o 7L6-/4 A- .50 0 Hzgl.Provided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-.,-,.; -.6II I i)n I+”/J/eImgure12.-Vs.riationofdamphg-in-rollparameterwitiaspectratioatCL O forwjngs8to18andatmaximumvaluesofdampinginroll forwings1to7.(Wings1to18ofTable1.)sProvided by IHSNot for ResaleNo reproduction or networking permitted without license from IHS-,-,-
