naca tn 118 f-5-l boat seaplane performance characteristics

7/27/2019 NACA TN 118 F-5-L Boat Seaplane Performance Characteristics

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-,VSIWCXRIIMITKE. WI AERONAUTIC .. , . / .. ..,.-. .

.,

AI?EOI?AUT.IS.ATIONALBVIWXYt20M.ZJITT!tEOR

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No.118 .?

iiE&PL4m- PERIOR~!ANOE-5-LBOAT CHARACTE3USTIS.By Lient w. s.Hem., -

Bureauof Aeronautics,.S,N.b

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NAT~ONALEV~S@yC()~ITTEEORAEl?CNAIJTICS.TECENICAGOTEIK).118.

F-5-LBOATSEAPLANEBy Lieu-t.

- pERFolO:ANCEH.AF?.ACT??I+ISTICS.W. S. IJiehl,.S.N.

ThisNote2s thesecondofa se:ieson perfcrmemcefServiceNfp+.ql Ai~G~~ft{In general,thaoutlineis quitesimilart.othat

1 ~ollo,~ednA,T=~. Noa 215(N9HPerformance),lthoughcertainI changeshavebeenfoundnecessaryn determiningruisingpeeds.

Theperformanceurvesgivenin ?$~gs.,S,and7 representoreor lessidealconditionsndwillhardlybe attainedexoeptby anexceptionalilotwithan airplanein goodshape.Experiencehasshown,however,thatservicedeviationsromtheidealvaluesshouldnotbe excessivendthattheidealconditionsaybeusedas a guideinobkin?ngthebestperforznanoe.

An explanationf thestallingpeedllsnecessary.In mostcasesthiswillbe considerablyowerthanthe landingpeed,m

q chieflybecauseof thelackof contro~.t theattituderequired1 to obtaintheslowestF05siblespeed. Thevaluesof ~~probablelandingspeedinclutteheeffectof thosefaotorstendingto in-


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.- 2-~ift= CL (1/2PV2)sBrag= ~ (1/2Pv=lS

inhereS isthewinganea~ v thevelocit:rnd P themassden-gityof theair. Theseequationsoldtrueanclthe coefficientsCLandCD havethesamevalueinanyconsist;n%y6temofunits.Ttshouldbe notedtkat P istheEagg-densityf theM.r,that9 is, the .7ei.ght per unitvolumedividedby theaccelerationfgrsvlty.Forforcein lbs.,J areainsq.ft.andvelocityinft/S5S.> P = .00237forstandard.iz;orfor forcein lbs.,areain~q.ft.andvelocityinmi/hr.,P = .0051 forstandardir.T~~variationfgiveninAircraft

P withaltitudeaybe obtainedromthecurve~.DesignData,Vol.I.ResistancefidVelocit~.

A summationf theparasiteresistanceorallpartsexceptthehullof theF-5-Lseaplanegives P = 812,lbs.at70 mi/hr.. 334lbs.of thisis in theslipstreamandtheremainder,78lbs..

. is clearof theslipstream.Theseresistancesaryas thesquareof thevelocityso thatat anyvelocityV, (mi/hr)thetotal


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Theresistanceftestona modelat the

-3-thehullwasfibtalnedroma windtunnelWashingtonavyYard.

Thewingreststauces o~taimdfromtheequations~.F)w = CD (~ PV2) (S3+

where S1 is thes~ thewingareawingareaclearof theslipstream(1297sq.:.:,.,intheslipstream(100sq.ft.)and F the.-slipstreanf5ui-tiok.i Thevelocityat eachangleof attackdependsuponthe corre-

spondingalueof CL> the~Pparentweightandtheeffective .are~,i.e., /v=

~w.CL*+Se

TheapFarentweightis theactualandtailsurfaces.Theeffective

weightlessareais the

theliftof thehullterm (S1+ ~ F) .

usedin findingthewingdrag., Wing,paraSite,ndtotalresistance,ndanglesof attackq areplottedforfullloadcondition13GO0lbs.)InFig,2.

EngineandPromellerCharacteristics.


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-4--Theeffi~iencyurveforan averageF-5-Lpropellers given

inFig.4.-

TheEffectiveorsepower,HP,requiredforhorizontallightat any airspeed V is determinedy thecorrespondin~otalre-

where V is inmi/hr. and ~T i8 in ~hS.ThemaximumHP availablet a~lys~sedis determinedy the

engineM@ andthepropellerfficiencyt thecorrespondingPM.CurvesofEHPrequiredforfullloadof 13600lbs.andfor

lightloadof 11000lbs.areplottedwiththec~e of ~ avai&-bleonFig.5, Tneintersectionsf thesecurvesindicate XW.x--imumspeedof 83.6mi/hr(72.5K] forthefullloadconditionnd85.3mi/hr.(74. K) forthelightloadcondition.

ThedifferenceeivreenheEHPrequiredandtheHP available,-.at anyspeed,istheexcessHP availableorclimbat thatspeed. .


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-5-7= 53000 2: 1nooo = 640ftjin.

Theabsoh%e ceilingis determinedy themaximmtheratio

valueof

3= MaximumHP available/HPequired.~orf-l load R = 1.61 whichindloatesn absoluteceilingof. 9209ft;forlightload R = 2.06whichindioatesn absoluteceil-ingof 14000 ft. Theactualabsoluteceilingwillfallsomewherebetweenthesevalues.Startingoutwithfullloadtheclimbshouldbe as plottedon Fig.6,up toan altitudeofapproximately

q &oaoft. Abovethisaltitudetheclimbdependslargelyon thetot-al weightandis thereforendeterminate.ozfullload,thetheserviceck_3iling2 i.e.thealtitudeat whiCh/ratef climbisft/min,,is 6500ft. Thetiine7000 ft.is givenby theczmve

Rateof Cl:iodild G3~;,lng.

of climbto anyaltitudelessonFig.6.azem.zchinfluencedy small

changesinpoworandweight,andthevaluesgivenmayappearb mistiowhencomparedithserviceperformancebtainednderorableconditions.

100than

Opti-tnlfav


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.. -6-

,

,

it is necessaryo calculateoreaok.peedthefaelconsuipt~.1in 3bs/hr.fzomhecorrespondingropellerfficiency,P requirecdid s~ecific: ~TjeL conauifipi~,ans TheresultingU-CWSG,Gttet.onFig.7j atetobe used.,nsteadof theHP requiredcurves,in o-o-tainingcruisingpeed$,

CruisingsFeedsfo~bothfulSloadandagainstwindvelocityinFig,8.

Stallingspeed-ProbablelandingHighspeed, . ,

@J.oulatederformance. .FullLoad13600lbs.

Poweron . . , . . . . .speed.Poweroff. . . .. . . . . . . . . . q . .

Speedatbestclimb . . . . . . . . . . .

lightloadareplotted

48mS/hr54.0mi/hr03.5 n57.0 66.3 19200ft.6800ft.390f%,frlin.3200ft.

(41. K)(46.8K) ~(72. K}(49.4K)(57. K;


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, -7dIJi@%LoadilOCOlbs.

,

.

,

Stallingspeed- po.vern . . . . . . . .Probablelandingspeed- Poweroff. . . .Ki@ speed. . . . . . . . . . . . . . . .Speeciatbestclimb.,. ... . . . . . . .Cruisingspeed(sti21air). . . . . . , .Absol~teoeiling. . . . . . . . . . . . .Serviceceiling. . . . . . . . . . . . .Initialrateof olimb. . . . . . . . . .ClimbiniOminutes, . . . . . . . . . . .

43.3mi/hr(37.6K)48.5 t (42.0K)85,3 (74. K)54,0 (46.8K)56.0 (48. K)140C0 f t.11800 r640ft/min.5100 ft.

F-5-LBoatSeaplane.Lengthover-all . . . . . . . . . . . . . 49f3-~1/16nHeightover-all,,... . . . . . . . . . 18t9-1/411Span:UpperWing. . . . . . , . . . . . . 103I9-1/41

Lowerwing. . . . . , . . . . . . . 74~3-7/8nChord- Bothwings. . . . . . . . q . 0 q a+ oftGap. . . . . . . . . . . . . . . . . . . . 81 l ol lStagger.. , . . . . . . . . . . . . . . . ~1 Ott

RAF-6


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. - e-Elevators,....... . . . . . ...55Fin. . . . . . . . . . . . . . . . . . . . 54,()Rudder. . . . . . . . . . . . . . . . . . 33.c)Non-skidfins,total. . . . . . . . t . . 31.0Engines(2)Liberty12 . . . , . . . . . . 360EHPat 1500RPYPropeller.. . . . . . . . . . . . . . . ]-016~ di~.eter5; 6!pitch

,

,

,

-JIaigllt

Lbs.perLbs.per

Deadl~ad. . . . j . . . . ~~~~l~s.FueX,gasand011. . . . .Totalusefulload. . . . . 3~~80Grossload. . . . . . , . 136~0 Sq.ft., . . q , . . * s q 9.?3BHP. . . . . . . . . . . . 18.8

C.G.location(approximate) 10!aftof .1 leadingedgeof lowerwingand3r 3belowthr~t line- Angleofwingchordto thrustlir.e4;angleof stabilizero thrustline+2. FullloadCalculated ActualFklghspeed . . . . . . . 72.5K 73.OK#Low speed. . . . . . . . . 42747K 43 K#Climbin 10minutes. . . . 3200ft. ~600ft #Absoluteceiling. . . . . . 9200ft. 9(Y2Opprox.


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26.2624.2422 .2220.20

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B .1614 .1412 .1210 ,108 .086.064.042.02


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A:l-:-------1 1 1.I1 t--....-..-;...+-. :.--..d- ~-. .._-I II ~ I-+--++4---4++-------- --+- ,


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Y) - /-- - - ~ -q--.-l --; :.:\4/-p = 1,00~lbs; /1 ;.--- ~!-- ..: -1 q .L. j .;- >i#-- .!. . . :_..I ~ -J ---,1 / J I......~._. ~. : II$ ,- - . - +- . I t. ,- . . . . . . . .A,---;,, I ,j!~ Y/...II i - i-- ~-+ ~---I*I! 1..\. I ! 7 ~.. .... ..-...-.--,..--.- I

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Indicatedirspeed knotsFig.7 F-5L~AT f j EApLA~~,~L coNs~TI oN ,I .


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Followingwhd-knots Head wind-knotsFig. 8. F-5L BOAT SEAPLANE- CRUISINGSPFEDS

naca tn 118 f-5-l boat seaplane performance characteristics

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