Value Hobby Piper J3 Cub 40 User manual

PiperJ3Cub40

Almost-Ready-to-Fly

INSTRUCTIONMANUAL

Specifications

Wingspan:70.6in(1795mm)

Length:45in(1145mm)

WingArea:682sqin(44sqdm)

FlyingWeight:5.3‐6.0lb(2400‐2700g)



Features

 Excellentscaledetailsandclassictrimscheme

 Easyfuselageaccesswithtopfuselagehatch

 Light‐weightbalsaandplywoodcontruction

 Completehardwareincluded

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DearCustomer,

CongratulationsonyourpurchaseofpiperJ3Cub40ARFfromValueHobby.Wethankyouforyourgenerous

support,andhopeyouenjoyyournewairplane.



AtValueHobby,wehopetooffercompetitiveprices,goodperformance,andproductsthatyoucansetupand

usewithease.That’swhyweextensivelyresearchedandtestedthisairplane,andsuggestedalltheproducts

necessaryforyoutosetupproperly.Weunderstandthatyouhavemanychoiceswhenpurchasing,andweare

gratefulyouchoosetobuyfromus.



Asvendors,oneofthemostgratifyingthingsforusistohearfromourcustomers.Wewouldwelcomeany

suggestiontohelpusimprove.Pleasemakeusawareofanyerrorsandimperfectionsintheairplaneorthe

instructions,oraboutthesetupthatwesuggested.Wehopeyou’llfindoursetupsuggestionstobehelpful,and

enjoyflyingyournewairplane.Pleasefeelfreetocontactusat(630)948‐0947oremailusat

support@valuehobby.com

Disclaimer



Bypurchasingand/orbuildingthismodel,userassumesALLliabilityandriskinvolvedwiththisproduct.This

modelshouldbebuiltandflownbyanexperiencedpilotandonlyflownatAMAsanctionedsites.



ValueHobbyguaranteesthismodeltobefreeofdefectsinmaterialsandworkmanshipatthedateofpurchase.

Thiswarrantydoesnotcoveranypartsdamagedbyuseormodifications.InnowayshallValueHobby’sliability

exceedtheoriginalcostofthepurchasedmodel.Further,ValueHobbyreservestherighttomodifythiswarranty

withoutnotice.ValueHobbyhasnocontroloverthefinalstagesofassemblyorthematerialusedforthefinal

assembly.Noliabilityshallbeassumednormaterialsusedforthefinaluser‐assembledproduct.Bytheactof

usingthefinalproducttheuseracceptsallresultingliability.ValueHobby,asaR/Cproductvendor,providesa

topqualityairplaneandinstructionstocompletethemodel.Thequalityandflightcharacteristicsofthefinished

modeldependgreatlyonhowitisbuilt;wecannotguaranteetheperformanceforthecompletedmodeland

representationsareexpressedorimpliedastotheperformanceofthecompletedmodel.Ifthebuyerisnot

preparedtoaccepttheliabilityassociatedwiththeuseofthisproduct,thebuyerisadvisedtoreturnthiskit

immediately,innewandunusedcondition.

SafetyinAssembly



Duringassemblyofthisaircraft,youwillbeaskedtousesharpknivesandhobbyadhesives.Pleasefollowall

safetyproceduresrecommendedbythemanufacturersoftheproductsyouuse,andalwaysfollowthese

importantguidelines:



ALWAYSprotectyoureyeswhenworkingwithadhesives,knives,ortools,especiallypowertools.Safetyglasses

arethebestwaytoprotectyoureyes.



ALWAYSprotectyourbody,especiallyyourhandsandfingerswhenusingadhesives,knives,ortools,especially

powertools.Donotcuttowardexposedskinwithhobbyknives.Donotplacehobbyknivesontablesorbenches

wheretheycanrollofforbeknockedoff.



ALWAYShaveafirst‐aidkithandywhenworkingwithadhesives,knives,ortools,especiallypowertools.



ALWAYSkeephobbyequipmentandsuppliesoutofthereachofchildren.

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SafetyinFlying

ThisisNOTatoy!Itisaveryhigh‐performanceRCairplanecapableofhighspeedsandextrememaneuvers.It

shouldonlybeoperatedbyacompetentpilotinasafeareawithpropersupervision.



ONLYflyyouraircraftinasafe,openarea,awayfromspectatorsandvehicles–andwhereitislegaltofly.



NEVERflyoveranunsafearea,suchasaroadorstreet.



Neverflytooclosetoyourselforspectators.



Neverrunyourmotorinsideahouseorbuildingwiththepropellerattached–Removethepropforsafety.

RequiredItems

CAGlue–ThinandThick

Epoxyglue

HobbyKnife

SmallPhillipsScrewdriver

SetMetricAllenWrenches

Scissors

SmallPliers

WireCutters

Maskingtape

Optional–Heatgun

BeforeStartingAssembly

Examination



Unpackyourairplaneandexaminethecomponents.Checkfordamageofanykind.Ifyouseeanydamage,

pleasecontactValueHobbyimmediately.



Covering



Yourairplanewaspackedinplasticatthefactorywithoutanywrinklesinthecovering.Youmaynoticesome

wrinklesnow;morelikely,youwillnoticeafewinadayortwoorthefirsttimeyoutaketheplaneouttothe

flyingfield.Thesewrinklesaretheresultofwoodshrinkageand/orexpansion.Balsawoodchangessizeand

shapeslightlyasitisexposedtovaryinghumidityintheair.Thisisanaturalpropertyofbalsawood.Asyour

airplaneadjuststotheweatherinyourpartoftheworld,wrinklesmayappearanddisappear.Wrinklesmaybe

removedwiththegentleapplicationofheattothecoveringmaterialonyourairplane.Thebesttooltouseisa

hobbyheatgun.Applytheheatgently:thecoveringmaterialwillshrinkasyouapplytheheat,andthiswill

removethewrinkles.BECAREFUL!Toomuchheatappliedtooquicklycandamagethecovering,eitherby

causingittopullawayfromthewoodatseamsandcornersorevenbymeltingit.Thecoveringwillshrinkatlow

temperaturewithpatientapplicationofheat.

WrinklesinthecoveringDONOTaffectflightperformance.

Removethecanopybeforeattemptingtouseheatonyourcovering!Thecanopyismadeofthermo‐activated

plasticandWILLdeformwiththeapplicationofheat.Donotapplyheattothecanopy.

Ifyouneedtocleanyourairplane,werecommendusingadamptowel.Thepaintusedonthecanopyandcowlis

notsafeforallcleaners.Inparticular,DONOTusealcoholontheseparts,itwillremovethepaint.

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RecommendedSetup



MainPartsoftheAirplane

Accessoriesandsmallpartsnotpictured

ConfigurationModelQty

Radio4channel 1

MotorSizeGForceG32BrushlessOutrunnerMotor（4250‐800KV)1

SpeedControl80ABrushlessESC1

Recommended

Battery（LiPO）GForce30C4000mAh4S14.8VLiPO1

PropSize14X7or15X61

ServosStandardservos5(nitro)

4(electric)

Y‐HarnessUniversalServoY‐Harness（300mm）11.8‐Inch(Futaba"J"and

JRCompatible)1

ExtensionUniversalServoExtension（600mm）23.6‐Inch(Futaba"J"and

JRCompatible)2

ChargerGTPOWERX‐CHARGERC66SLiPOCharger1

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Section1:AileronInstallation

Step1.Locatetheaileronhingesfromthehardware

pack,andinsertthehingesintheslotsinthetrailing

edgeofthewing.

Step2.SaturateeachofthehingeswiththinCA.Make

suretoglueboththetopandbottom.

Step3.Usethehingetoputtheaileroninposition.

Useahobbyknifetosetthegapbetweenthecontrol

surfaceandthewing.Alsocheckthattheaileroncan

movefreelywithoutrubbingatthewingtip.

Step4.Flextheaileronupanddownseveraltimesto

breakintheaileronhinges.

Step5.Repeatsteps1through4toinstallthe

remainingaileron.



Section2:AileronServo&Control

HornInstallation

Step1.Locatetheitemsshowninthepicturebelow.

(ServosandY‐Harnesssoldseparately).

Step2.Removethecoveringfortheinboardservoin

thebottomofthewingasshown.

Step3.Gluetheservomountingblockstotheservo

hatch.(Thelocationhasbeenmarked).



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Step4.Placeaileronservobetweenthemounting

blocksandmounttheservototheblocks.(Please

centertheservoarmelectronicallybeforemounting).

Step5.Usetwoself‐tappingscrewstosecurethe

blockswontloose.

Step6.Tieawheelcollarontoapieceofstring.Drop

thewheelcollarintothewingfromtherootand

retrieveitfromtheservoopening.

Step7.Tiethestringontotheservoextension.Gently

pulltheextensionthroughthewingusingthestring.

Untiethestringwhentheservoleadhasbeenpulled

through.Usetapetosecuretheservoleadtothewing

topreventitfromfallingbackintothewingpanel.



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Step8.Securethehatchtothewing.

Step9.Connecttheclevistothecontrolhorn.Center

thecontrolsurfaceanduseapentomarkthe

pushrodwhereitcrossestheholeoftheservohornas

shown.

Step10.Bendthepushrod90‐degreeatthemark,trim

theexcesswiredependingonthelengthofthewire

needed,anduseapushrodconnectortosecurethe

pushrodwiretotheservohorn.

Step11.Repeatsteps1through10toinstallthe

remainingservo.



Section3:ElevatorInstallation

Step1.Slidethehorizontalstabilizerintotheslotin

thefuselage,andcenterthestabilizerinthefuselage.

Step2.Tracetheoutlineofthefuselageonthe

horizontalstabilizerusingafelt‐tippedpen.

Step3.Removethecoveringfromthehorizontal

stabilizerinsidethelinedrawninthepreviousstep.

Step4.Positionthestabilizerandelevatoronaflat

surfaceasshown,andmakesuretheyarein

alignmentwitheachother.Thencenterthejoiner

wireontheelevatorandmarktheelevator.

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Step5.Carveslotsanddrillholesforthejoinerwireon

thelocationsmarkedontheleadingedgeofthe

elevators.

Step6.Slidethejoinerwireintotheslotinthe

fuselageasshown.

Step7.Insertfourhingesintotheslotsintheelevators

andsaturateeachofthehingeswiththinCA.Make

suretoglueboththetopandbottom.

Step8.Usethehingesandjoinerwiretoplacethe

elevatorsinposition,andflextheelevators

45‐degreesafewtimesupanddown,makesurethe

elevatorcanmovefreely.ThenapplythinCAonthe

hinges.

Step9.Carefullycheckthealignmentofthestabilizer

tothewingtomakesureA=Basshown.

Step10.ApplythethinCAonboththetopandbottom

ofthestabilizertosecurethestabilizerontothe

fuselage.

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Section5:Rudderandtailwheel

Installation

Step1.Slidethefinbackintothefuselage.Checkthe

alignmentofthefintothestabilizerusingasquare.

Thefinmustbe90degreestothestabilizerwhen

properlyaligned.

Ifnot,carefullysandthebottomofthefintoprovide

theclearancetoalignthefin.

Step2.Insertthefinintotheslotinthefuselageand

applysomeglue.Makesurethefinisfullysecured.

Youmightalsouse30‐minuteepoxytosecurethefin.

Applytheepoxytoboththeexposedwoodonthefin

andtheslotinthefuselage.Usecarenottogetepoxy

ontheelevatorjoinerwire.Insertthefinandusetape

toholdthefininpositionuntiltheepoxyfullycures.

Step3.Locatethetailwheelassembly.Roughenthe

tailgearwireusingmediumgritsandpaperwhereit

willentertherudder.Getthemassembled.

Step4.Drillaholeintherudderforthetailwheelwire.

Insertthehingesintotheslotsintherudderandtest

fitthewheelwireintothegroove.(Bendthewire

90‐degreessoitcaninsertthepre‐drilledhole).

Step5.Securethetailwheelbrackettothefuselage

usingtwo＃2x3/8insheetmetalscrews.



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Step6.Slidethewheelcollaragainstthetailwheel

bracketandtightenthesetscrew.



Section6:LinkageInstallation

(RudderandElevatorServo)



Step1.Locatetheitemsnecessaryforthissection.



Step2.Threadaclevisontoa6inwireaminimumof

10turns.



Step3.Removethebackplatefromacontrolhorn

usingsidecuttersorasharphobbyknife.Positionthe

controlhornontheelevatorsothehornalignswith

thehingelineoftheelevator.Markthepositionfor

themountingholesusingafelt‐tippedpen.



Step4.Drillthree3/3 2 i n holesthroughtheelevatorat

thelocationsmarkedinthepreviousstep.

Step5.Place2‐3dropsofthinCAintotheholeto

hardenthewood.Repeatthisforeachofthethree

holes.

Step6.Attachthecontrolhornusingthree2‐56x1/2

screwsandthecontrolbackplate.

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Step7.Attachthepushrodconnectortotheholeof

theservoarmasshown.

Step8.Slidethewirethroughtheouterholeinthe

elevatorservoarm.Securethewireusinganylonwire

keeper.Itmaybenecessarytodrillouttheholeinthe

servoarmusinga5/6 4 " drillbit.

Note:Usea1/4 " pieceofheatshrinktubingonthe

clevistokeepitfromopeningduringflight.

Step9.RepeatSteps2through8fortherudder

linkage.

Section7:NitroMotorInstallation

Step1.Locatetheitemsshowninthepicture.



Step2.UsingfourPM4X.7874inSHCS,fourM4fiat

washers,fourM4lockwashers,andthreadlocking

compound,attachtheenginemountrailstothe

firewall.Leavethescrewsslightlyloose.Testfityour

enginebetweenthemounthalves.Slidethemount

halvesagainstthesidesoftheengineandfinish

tighteningthemountscrews.

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

Step3.Positionthefrontoftheenginedrivewasher

4.1338in(105mm)fromthefrontoftheengine

mountingbox.Markthelocationoftheenginemount

holesontothemountrailsusingaDeadCenterHole

LocatorRemovetheenginefromthemountandusea

Ф4tapanddrillsettocreatethreadsinthefour

mountingholes.Attachtheenginetothemountusing

fourPM420mmSHCS,fourФ4fiatwashers,andfour

Ф4lockwashers.



Step4.Prepareanassembledservohornarmas

shown.



Step5.Attachaquickconnectortotheservoarm

usingquickconnectorwashersandretainers.Center

thethrottlestickandtrimwithboththereceiverand

transmitteron.Installthethrottleservoarminthe

neutralposition.



Step6.Movetheservotothethrottleopenposition

usingtheradiosystem.Manuallymovethethrottle

armonthecarburetortotheopenposition.Usea

3mmsetscrewtosecurethethrottlepushrodwire.



Step7.Checkthemovementofthethrottletoverify

thereisnobindingateitherloworhighthrottle.If

thereis,makethenecessaryadjustmenttoeliminate

anybinding.Installthethrottleservoarmscrewwhen

complete.



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Section8:FuelTankInstallation

Step1.Thefueltankcanbeassembledasatwoline

systemconsistingofavent(pressure)linetothe

mufflerandacarburetorline.Fillingandemptyingof

thetankwouldneedtobedonethroughthe

carburetorline,oranoptionalfuelfillvalve.Thetank

canalsobeassembledasathreelinesystemhavinga

ventline,carburetorline,andfillline.Ifinstallafill

line,puncturethetopofthestopperabovethesealed

offfueltubehole.Thefillandcarburetorlinesshould

extendout13mmbeyondthestopperandthevent

lineshouldbebentupwardsandleftuncut.Withthe

tubesinstalledinthestopper,thestopperplates

looselyinplacewiththePM3x25mmscrewtohold

theassemblytogether.

12mm

Step2.Fitthestopperassemblyintothetankwiththe

ventlinepointingtowardthetopofthetank,butnot

touching.Thefueltubingandclunks(fuelpickup)on

thecarburetorandfilllinesshouldalmostreachthe

backofthetankbutnottouch.Theclunksmustbe

abletomovefreelyinsidethetankwhenassembled.

Adjustthelengthofthefueltubingaccordingly.When

satisfied,tightenthePM3x25mmscrewinthestopper

tosecureitinplace(donotover‐tighten).Markthe

sideofthetankthatmustfaceupwheninstalledin

theplane.Wealsosuggestmarkingthetubesinthe

stopper.



Step3.Insertthetankintothefuselagewiththe

correctsidefacingup.Thefueltubingshouldbe

routedthroughtheholeinthecenterofthefirewall.

Section9:LandingGear&Wheels

Installation

Step1.Locatethepartsofthemainlandinggearfrom

thehardwarepack.

Step2.Installthemainwheelsonthewheelpantsas

shownbelow.

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Step3.Repeatsteps2fortheothersideofthelanding

gear.



Step4.Installthelandinggearlegsintothefuselage

withtheprovided3mmscrewsasshownbelow.

Section10–ElectricMotorandESC

Installation

Step1.Locatetheitemsforthissection.

Step2.Installyourbrushlessmotorontothemotor

mountusingthe4black3mmallen‐headscrews

includedinyourkit.Makesurethemotorspinsfreely.

Dependingonthesizeoftheshaftcollaronyour

motor,youmayneedtoremoveasmallamountof

woodfromthefirewallforfreerotation.



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Step3.InstalltheESCinsidethemotorboxorinside

thefuselage,dependingontherequirementof

balancingtheCG.

Section11:CowlingandSpinner

Installation

Step1.Installthecowlandaligncarefullysothatthe

spinnermatchesthecowlasdesired.Besurecanopy

hatchisinplaceforthisstep.

Step2.Useahobbyknifetomakesmallholesthrough

thepaperstripsintothecowling.Thislocatesthecowl

screwsaccuratelysothattheywillscrewintothe

plywood.Usethe4smallremainingwoodscrewsto

mountthecowl.



Step3.Fixcarefullythepropandspinnerasshown

below.

Section12:WindowsInstallation

Step1.Locatethefrontwindscreenandsidewindows.

Usethehobbyscissorstotrimthesidewindowsfrom

theirsheets.

Step2.Removethecoveringsforsidewindows.



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Step3.Use4screwstosecurethefrontwindscreento

thefuselage.

Step4.UsethinCAtosecurethesidewindowstothe

fuselage.



Step5.Thehatchisremovable.

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Section13:WingInstallation

PartsRequired.

Step1.Slidethewingtubeintothewingpanel.Slide

thetubeandpanelintopositiononthefuselage.

Step2.SecurethewingpanelusingaM6*25MM

nylonbolt.

Section14:SettingCGandControl

Throws

RecommendedCG

Forthefirstflights,therecommendedCenterof

Gravitylocationis84mmbehindtheleadingedgeof

thewingagainstthefuselage.Usethebatterypack,

movingitforwardorbackward,toachievethecorrect

balance.

Low/PrecisionRates(indegrees)and

CorrespondingExponential



Elevator

LowRate

11/16"(11.5º)Up9/16"(10º)Down

HighRate

1/4 " (19.5º)Up1"(18º)Down



Linearmeasurement(Inches)measuredatwidest

partofelevator(roughlyinthecenter).



Aileron

LowRate

3/8 " (8º)Up1/2 " (9º)Down

HighRate

7/8 " (21º)Up11/16"(22º)Down



Linearmeasurement(inches)measuredatroot.

Rudder

11/2"(28º)Left11/2"(28º)Right

Linearmeasurement(inches)measuredatfrontof

counterbalance.

Note:UsetheLowRateformostflying.TheHigh

Rateisusedspecificallyforperformingspin

maneuvers

Note:thatFutabaandHitecradiosrequire

NEGATIVEexponential,whileJRandSpektrumuse

POSITIVEexponential.

Rangetestyourradio

step1.Beforefly,besuretorangecheckyourradioas

manufacturer’sinstructionmanualofyour

radio‐systemrecommends.

step2.Double‐checkallcontrols(aileron,elevator,

rudderandthrottle)moveinthecorrectdirection.

step3.BesurethatyourLiPObatteryisfullycharged.

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Finally...

Enjoy Your Piper Cub J3 40

Have a nice flight!

Value Hobby Piper J3 Cub 40 User manual

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