FUTABA SkyLeaf Leader User manual

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This product is for F3A competition. It can not be assembled or ﬂighted by a beginner. It

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Thank you for purchasing Futaba Sky Leaf R/C airplane.

To maximize your enjoyment, and to ensure proper

ﬂying, please read through this assembly

instruction manual.

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1. This product is only designed for use with radio control models. Use of the product described in this instruction manual is

limited to radio control models.

2. Modiﬁcation, adjustment, and parts replacement:

Futaba is not responsible for unauthorized modiﬁcation, adjustment, or replacement of parts on this product.

3.Your Sky Leaf should not be considered a toy, but rather a sophisticated, working model that functions very much like a full-

size airplane. Because of its performance capabilities, this airplane, if not assembled and operated correctly, could possibly

cause injury to yourself or spectators and damage to property.

4.You must assemble the model according to the instructions. Do not alter or modify the model, as doing so may result in an

unsafe or unﬂyable model. In a few cases the instructions may differ slightly from the ﬁgures. In those instances the written

instructions should be considered as correct.

5.You must take time to build straight, true and strong.

6.You must use an R/C radio system that is in good condition, a correctly sized motor, and other components as speciﬁed in

this instruction manual. All components must be correctly installed so that the model operates correctly on the ground and

in the air. You must check the operation of the model and all components before every ﬂight.

■No part of this manual may be reproduced in any form without prior permission.

■The contents of this manual are subject to change without prior notice.

■Futaba is not responsible for the use of this product by the customer.

■Company and product names in this manual are trademarks or registered trademarks of the respective company.

Precautions

Forsafeuse

Please observe the following precautions to ensure safe use of this product at all times.

Meaning of Special Markings:

The parts of this manual indicated by the following marks require special attention from the standpoint of safety.

DANGER - Procedures which may lead to dangerous conditions and cause death/serious injury if not carried out

properly.

WARNING - Procedures which may lead to a dangerous condition or cause death or serious injury to the user if not

carried out properly, or procedures where the probability of superﬁcial injury or physical damage is high.

CAUTION- Procedures where the possibility of serious injury to the user is small, but there is a danger of injury, or

physical damage, if not carried out properly.

= Prohibited = Mandatory

WARNING:AlwayskeepR/Ccomponentsawayfromsmallchildren.

Assembly precautions

We,asthemanufacturer,provideyouwithagood

quality,thoroughlytestedkitandinstructions,but

ultimatelythequalityandﬂyabilityofyourﬁnishedmodel

dependsonhowyoubuildit;therefore,wecannotin

anywayguaranteetheperformanceofyourcompleted

airplane,andnorepresentationsareexpressedorimplied

astotheperformanceorsafetyofyourcompleted

airplane.

Takeyourtimeandfollowtheinstructionstoendup

withawell-builtmodelthatisstraightandtrue.

First-timebuildersshouldseektheadviceof

experiencedmodellersbeforebeginningassemblyandif

theydonotfullyunderstandanypartoftheconstruction.

Installingamorepowerfulmotorthanspecifiedor

flyingthehi-speedaggressivelymayleadtoserious

damageandaccidents.

Maketheassemblycorrectwiththismanual.

■Iftheassemblymanualisnotfollowed,inﬂightfailureordanger

tomodelandpropertycouldoccur.

DonotﬂybeforeconﬁrmingthecorrectlocationoftheC.G.

■ IftheCGisincorrect,themodelwillbediﬃculttoﬂyandcould

leadtoacrash.

Sincethedirectionoftheservosofanairplanecanbe

easilymistaken,beverycareful.

■Doublecheckthatalldirectionsarecorrect.

Donotuseanoverpoweredmotorortoolargeof

propelleronthisairframe.

■Whennotequippedproperly,theperformancemightnotbeas

describedbythemanufacturer.

Makesurethatallsurfacesarelevelbeforeﬂying.

■Ifthesurfacesarenotlevel,theairplanewillnotﬂystraightand

willbehardtocontrol.

Assemblethisairplaneonlyinplacesoutofchildren's

reach.

■Asmallchildmayaccidentallyoperatethesystem.Thiscould

causeadangeroussituationandinjuries.Eachpartcanbevery

dangerouswhenmishandledandcausechemicaldamage.

Usegluesandadhesivesthatareneededforassembly

inawellventilatedarea.

■Poorventilationcouldleadtotoxicfumesbeinginhaled.

DANGER

Donotdirectlyexposemodeltofuel,oil,exhaustgas,

etc.

■Ifleftinsuchanenvironment,themodelmaybeattackedand

damaged.

Donotaddanyextradevicesthatarenotsuggestedby

thefactoryontheairplane.

■Iftheairplaneischangedtoomuch,themanufacturecannot

promisecorrectperformance.

Storage and disposal precautions

Other precautions

CAUTION

Donotstoredevicesinthefollowingplaces:

・Whereitisextremelyhot(30℃[86F]orhigher)orcold(0℃[32F]

orlower)

・Wheretheequipmentwillbeexposedtodirectsunlight

・Wherethehumidityishigh

・Wherevibrationisprevalent

・Whereitisverydusty

・Wherethedevicemaybeexposedtosteamandheat

CAUTION

Whenthedevicewillnotbeusedforalongtime,

removethebatteryfromthetransmitterandaircraft

andstoretheminadryplacewherethetemperatureis

between0and30℃ [32Fand86F].

■Leavingbatteriesinsideyourmodelandradiowhentheyarenot

beingusedforlongperiodswill resultin batterydeterioration,

liquidleakageandotherdamage.

JointheAcademyofModelAeronautics.

■The AcademyofModelAeronautics(AMA) providesguidelines

andliabilityprotectionshouldtheneedarise.

AlwaysusegenuineFutabaproductssuchas

transmitter,receiver,servo,etc.

■Futabaisnotresponsiblefordamagesustainedbycombination

withotherthanFutabaGenuineParts.Usethepartsspeciﬁedin

theinstructionmanualandcatalog.

Flying precautions

DANGER

Takeenoughsafetyprecautionspriortooperatingthis

model.Youareresponsibleforthismodel'sassemblyand

safeoperation.

First-timefliersshouldseekadviceforhintsinpre-

ﬂightadjustmentsandassemblyfromexperiencedﬂiers.

Beremindedthatflyingabadlyassembledorbadly

adjustedairplaneisverydangerous.

Inthebeginning,first-timefliersshouldalwaysbe

assistedbyanexperiencedﬂierandneverﬂyalone.

Beforeflyingyourairplane,ensuretheairfieldis

spaciousenough.Alwaysﬂyitoutdoorsinsafeareaswith

nodebrisorobstacles.

Ensurethepropelleraresecurelyinstalled.

Donotﬂyyourairplaneondayswithstrongwindsor

sidewinds.

Donotallowabystandertogettooclosetothe

propeller.

Donotusedefectivepropellers.

Nevergraspthetransmitterantennawhileﬂying.

■Thetransmitteroutputmaydropdrastically.

Alwaysmakesurethatalltransmitterstickmovements

operateallservosproperlyinthemodelpriortoflight.

Also,makesurethatallswitches,etc.functionproperly

aswell.Ifthereareanydiﬃculties,donotusethesystem

untilallinputsarefunctioningproperly.

Whileoperating,nevertouchthetransmitterwith,

orbringthetransmitternear,anothertransmitter,acell

phone,orotherwirelessdevices.

■Doingsomaycauseerroneousoperation.

Donotpointtheantennadirectlytowardtheaircraft

duringﬂight.

■Theantennaisdirectionalandthetransmitteroutputisweakest.

(Thestrengthoftheradiowavesisgreatestfromthesidesofthe

antenna.)

Neverﬂyonarainyday,whenthewindisstrong,and

atnight.

■Watercouldlead tofailureorimproperfunctionalityandpoor

controloftheaircraftwhichcouldleadtoacrash.

Neverturnthepowerswitchonandoﬀduringﬂightor

whilethemotorisrunning.

■Operationwillbecomeimpossibleandtheaircraftwillcrash.

Evenifthepowerswitchisturnedon,operationwillnotbegin

untiltransmitterandreceiverinternalprocessingiscomplete.

Donotﬂywhenyouarephysicallyimpairedasitcould

poseasafetyhazardtoyourselforothers.

Donotﬂyatthefollowingplaces:

■ Nearanotherradiocontrolﬂyingﬁeld.

■ Nearorabovepeople.

■ Nearhomes,schools,hospitalsairports,roadsorotherplaces

wherepeoplecongregate.

■ Nearhighvoltagelines,highstructures,orcommunication

facilities.

Whensettingthetransmitteronthegroundduring

ﬂightpreparations,donotstanditupright.

■Thetransmittermaytipover,thesticksmaymoveandthe

propellermayrotateunexpectedlyandcauseinjury.

Donottouchthemotor,motorcontroller,duringand

immediatelyafteruse.

■Theseitemsmaybecomehotduringuse.

Forsafety,ﬂysothattheaircraftisvisibleatalltimes.

■Flyingbehindbuildingsorotherlargestructureswillnotonly

causeyoutolosesightofthe aircraft,butalsodegradetheRF

linkperformanceandcauselossofcontrol.

Fromthestandpointofsafety,alwayssetthefailsafe

function.

■Inparticular,normallysetthethrottlechanneltoidle.

Whenflying,alwaysreturnthetransmittersetup

screentotheHomescreen.

■Erroneousinputduringﬂightisextremelydangerous.

Alwayschecktheremainingcapacityofthetransmitter

andreceiverbatteriesbeforeeachﬂyingsessionpriorto

ﬂight.

■Lowbatterycapacitywillcauselossofcontrolandacrash.

Alwayscheckoperationofeachcontrolsurfaceand

performarangetestbeforeeachﬂyingsession.

■ Evenonetransmittersettingoraircraftabnormalitycancausea

crash.

Beforeturningonthetransmitter:

1.Alwaysmovethetransmitterthrottlestickpositiontothe

minimum(idle)position.

2.Turnonthetransmitterﬁrstandthenthereceiver.

Whenturningoﬀthetransmitter'spowerswitchafter

themotor/enginehasstopped(stateinwhichitwillnot

rotateagain):

1.Turnoﬀthereceiverpowerswitch.

2.Thenturnoﬀthetransmitterpowerswitch.

■Ifthepower switchisturnedon/oﬀintheoppositeorder,the

propellermayrotateunexpectedlyandcauseaseriousinjury.

■Alsoalwaysobservetheaboveorderwhensettingthefailsafe

function.

■Maximumlowthrottle:Directioninwhichthemotorrunsatthe

slowestspeedorstops.

Whenadjustingthetransmitter,stopthemotor,

disconnectthemotorwiringthatallowsittocontinue

operation.Whendoingso,pleaseexerciseextreme

caution.Ensurethattheaircraftissecuredandthatit

willnotcomeintocontactwithanythingoranyone.

Ensurethatthemotorwillnotrotatepriortomakingany

adjustments.

■Unexpectedhighspeedrotationofthemotormaycausea

seriousinjury.

Thisairframeisnotdesignedtoﬂyatexcessivelyhigh

speeds.

■Theairplanecouldbecomedamaged.

Donotrechargeabatterythatisdamaged,

deteriorated,leakingelectrolyte,orwet.

Donotallowthechargerorbatterytobecomewet.

■Donotusethechargerwhenitoryourhandsarewet.Donot

usethechargerinhumidplaces.

Donotshortcircuitthebattery. 

Donotrepair,deform,modify,ordisassemblethe

batteryand/orbatterycharger.

Donotdropthebatteryintoaﬁreorbringitnearaﬁre.



Donotchargeandstorethebatteryindirectsunlight

orotherhotplaces. 

Donotchargethebatteryifitiscoveredwithany

objectasitmaybecomeveryhot.

Donotusethebatteryinacombustibleenvironment.

■Thegascouldigniteigniteandcauseanexplosionorﬁre.

Alwayschargethebatterybeforeeachﬂyingsession.

■ Ifthebatterygoesdeadduringﬂight,theaircraftwillcrash.

Battery and charger handling precautions

DANGER

■ Chargingthe batterypastthespeciﬁedvalue maycauseaﬁre,

combustion,rupture,orliquidleakage.

■ Donotchargethebatterywhileridinginavehicle.Vibrationwill

preventnormalcharging.

WhenusingtheLithiumbattery,donotconnectthe

chargertothebalancechargeconnectorandthepower

connectoratthesametime.

■ Doingsocouldcauseaﬁre,combustion,generationofheat,

rupture,orliquidleakage.

Insertthepowercordplugﬁrmlyintothereceptacleup

toitsbase.

Alwaysusethechargerwiththespeciﬁedpowersupply

voltage.

■Usethespecialchargerbyconnectingittoaproperpower

outlet.

Ifthebatteryliquidshouldgetinyoureyes,donotrub

youreyes,butimmediatelywashthemwithtapwateror

othercleanwaterandgettreatedbyadoctor.

■Theliquidcancauseblindness.

Donottouchthechargerandbatteryforanylengthof

timeduringcharging. 

■Doingsomayresultinburns.

Donotuseachargerorbatterythathasbeen

damaged. 

Donottouchanyoftheinternalcomponentsofthe

charger.

■Doingsomaycauseelectricshockoraburn.

Ifanyabnormalitiessuchassmokeordiscolorationare

notedwitheitherthechargerorthebattery,removethe

batteryfromthetransmitterorchargeranddisconnect

thepowercordpluganddonotusethecharger.

■ Continuedusemaycauseﬁre,combustion, generationof heat,

orrupture.

Donotsubjectthebatteriestoimpact.

■ Doingsomaycausefire,combustion,generationofheat,

rupture,orliquidleakage.

WARNING

Useandstorethebatteryandbatterychargerina

securelocationawayfromchildren.

■ Notdoingsomaycauseelectricshockorinjury.

Ifthebatteryleaksliquidorgeneratesanabnormal

odor,immediatelymoveittoasafeplacefordisposal.

■Notdoingsomaycausecombustion.

Ifthebatteryliquidgetsonyourskinorclothing,

immediatelyﬂushtheareawithtapwaterorotherclean

water.

■Consultadoctor.Theliquidcancauseskindamage.

Afterthespecifiedchargingtimehaselapsed,end

charginganddisconnectthechargerfromthereceptacle.

Whenrecyclingordisposingofthebattery,isolatethe

terminalsbycoveringthemwithtape.

■Shortcircuitoftheterminalsmaycausecombustion,generation

ofheatorrupture.

Donotplaceheavyobjectsontopofthebatteryor

charger.Also,donotplacethebatteryorchargerinany

locationwhereitcouldfall.

■Doingsomaycausedamageorinjury.

Donotstoreorusethebatteryandchargerwhereitis

dustyorhumid.

■ Insertthepowercordplugintothereceptacleonlyafter

eliminatingthedust.

Aftertheaircraft/transmitterhasbeenusedforalong

time,thebatterymaybecomehot.Immediatelyremoveit

fromtheaircraft/transmitter.

■ Notdoingsomaycauseaburn.

CAUTION

Donotchargethebatteryinextremetemperatures.

■ Doingsowilldegradethebatteryperformance.Anambient

temperatureof10℃to30℃(50Fto86F)isidealforcharging.

Unplugthechargerwhennotinuse.

Donotbendorpullthecordunreasonablyanddonot

placeheavyobjectsonthecord.

■Thepowercordmaybedamagedandcausecombustion,

generationofheat,orelectricshock.

Installationofaileron,elevator,rudder,hinge

Installationofaileronservomount

Theexplanationisshowingtheaileronasanexample,butattachtheelevatorandrudderhingeinthe

sameway.

InserthalfthehingeintotheaileronandadheretheCAglue.Afterdrying,inserttheaileronintothemain

wingandpourtheCAglueintothehinge.Thereshouldbenoclearancebetweenthemainwingandthe

ailerons.

Afterdrying,checkthattheaileronmovessmoothly.

Cuttheﬁlmoftheaileronservomountingholeofthemainwing.Removetheaileronservomountingbase

fromtheincludedpre-cut3mmwoodplateandpaintthecoloraccordingtoyourpreference.Inthesample

itispaintedwhite.Tracetheservomountontotheﬁlmusingathinmarker.Stripouttheﬁlm1mminward

andremoveit.AdheretheservomountwithCAglue.

Installationofaileronservo.Aileronlinkage

Recommendation:BLS173SVi×4,EXTcode200mm×4,S.BUSHUB120-70×2

Cuttheﬁlmattheexitoftheservowireinthecenterofthemainwing.Passtheservowireinsidethemain

wing.Itisalsoagoodmethodtoguidewithaweightedstring.

Attachtheaileronservotothemountwithatappingscrew.

Attachthecontrolhorntotheailerons.

Usingtheguide-#7(photo),ﬁrstmakeaholewitha2mmdrillandthencreateamountingholeforthe

controlhorn.Todeterminethepositionofthecontrolhornwithreferenceto#8.

Maketheaileronlinkage.#9-#11

Cuttheﬁlmoftheholeswithstrutsonthemainwing.

5 6

7 8

Recommendation:BLS173SVi×2

Theservoismountedinsidethehorizontalstabilizer.First,connecttheservotothereceiverandplaceitin

theneutralposition.

AttachHornAtotheservo,ﬁndthearmthatisabout15degreesforwardandcutoﬀtheotherextraarm.

Removetheservohornandplacetheservoonthehorizontalstabilizer.Whilecheckingthepositionwhere

theservohornexitsthehorizontalstabilizer,openthehorndriveholeinthehorizontalstabilizer.

Maketheelevatorlinkage.

Installationofelevatorservo.Elevatorlinkage

11 12

13 14

ThismanualexplainsthefrontmountsuchasAdverrunContraunit.O.S.F3Amotor(motorreduction).

Necessary:Woodmade(5-6mm)motormount(accordingtothelastﬁgureofthismanual),Epoxyglue,

Microballoon,Glasscloth.

Cutthefrontpartofthefuselagelike#18.Thedownthrustﬁtsthefrontofthefuselage.Foranormal

propeller,makesurethesidethrustisatright3degrees.InthecaseofContraunit,thesidethrustis

0degree.Makesuretheclearancebetweenthespinnerplateandthefrontofthefuselageis3-5mm.

BondtheWoodmade(5-6mm)motormount(accordingtothelastﬁgureofthismanual)tothefront.

Usemicroballoonsmixedwithepoxyadhesive.Afterbonding,reinforcetheglassclothwithepoxyadhesive.

OpentheM3screwholesforattachingthemotorunitin4places.Usethefrontmountofyourmotorunit

tocheckthecenterpositionandthendeterminetheholeposition.

Motormount

15 16

17 18

InstallationofMotorunit

ThismanualexplainsthefrontmountsuchasAdverrunContraunit.

Attachthefrontmounttothemotorunit.ThenattachittothefuselagemountwithM3capbolt.Makesure

thatthescrewandthespinnerdonotinterfere.

Makearearmountwith3mmwoodplate.Installitlike#24.

21 22

23 24

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