Value Hobby TWEETY - 25 User manual

TWEETY‐25
Almost‐Ready‐to‐FlyNitro/ElectricAerobat
INSTRUCTIONMANUAL

SPECIFICATIONS
WINGSPAN:45.7”(1160mm)
LENGTH:38.6”(980mm)
WINGAREA:370sqin(24sqdm)
FLYINGWEIGHT:Approx.3.3lbs(1500g)
SUGGESTEDPOWERSYSTEM:GForceG15(3542)
BrushlessElectricMotoror.15‐25NitroMotor
SUGGESTEDRADIOSYSTEM:4‐CH,4‐5StandardServos
FEATURES
Light‐weightlaser‐cutplyandbalsaconstruction.
Detachablefuselagehatchforeasyaccessofbattery
andelectronics.
Convenientlypoweredbyeitheranelectricoranitro
motor.
Pre‐coveredinhighvisibilitytrimscheme.

WARNING
ThisradiocontrolledmodelisNOTatoyandNOTintendedforpersonunder16yearsold.Keepthiskitoutofreachofyoungerchildren,asit
containspartsthatcouldbedangerous.Aradiocontrolledmodeliscapableofcausingseriousbodilyinjuryandpropertydamage.Itistheowner's
responsibilitytoassembletheaircraftproperly.TestflyyourmodelinthepresenceofanexperiencedRCmodeler.Yourmodelmustalwaysbe
operatedandflownusinggreatcareandcommonsense,aswellasinaccordancewiththesafetycodeoftheAMAorMAAC.Wesuggestyou
purchaseproperinsurancepriortoflyingthismodel.TheFCCrequiresthatyouuseonlyradiofrequenciesspecifiedforR/Cmodelaircraft.Donotat
anytimeflythismodelwhileundertheinfluenceofdrugsoralcohol.
PartsoftheAirplane


1.Fuselage
2.Finandrudder
3.Wing
4.Horizontalstabilizerandelevator
5.Canopy


IncludedHardware

Pleasenotethefollowingabbreviationsusedinthismanualaboutfasteners:
1. CMmeanssocketheadscrews,e.g.CM4means4mmsocketheadscrews
2. PWAmeansself‐tappingscrews,e.g.PWA2/PWA3means2or3mmself‐tappingscrews
3. PMmeansroundheadmachinescrews,e.g.PM4‐4mmroundheadmachinescrews
4. Ф1.8X600mmmeans1.8mmdiameterand600mmlengthpushrod
Qty
1.Rudderpushrod[Ф1.8X600mm]2
2.Elevatorpushrod[Ф1.8X600mm]2
3.Throttlepushrod[Ф1.5X300mm]1
4.Aileronpushrod[Ф1.8X150mm]2
5.Elevatorjoinerwire[Ф2X84mm]1
6.Tailwheelassembly1
7.Fueltank1
8.Wingjoinerstrip1
9.Electricmotormountingplate1
10.Wingjoinerplate1
11.Fueltankmountingbraces1
12.Electricmotormountingblock4
13.Mainwheels2
14.Landinggear1
15.Socketheadscrewsforuseasmainwheel
shaft[CM3X35mm]
2

Qty
16.Roundheadmachinescrews(securing
wingstoFuselage)[PM3X30mm]
2
17.Roundheadmachinescrewsforsecuring
landinggear[PM3X20mm]
2
18.PushrodEZ‐connectorforthrottleservo
[Ф2.1mm]
1
19.Self‐lockNutsforsecuringwheelshaft
[Ф3mm]
4
20.Controlhorn4
21.Roundheadmachinescrewsforcontrol
horns[PM2X20mm]
12
22.Self‐tappingscrewsforsecuringCanopy
[PWA3X10mm]
4
23.M3Washer6
24.Clevises4
25.EZlinkforpushrodZ‐Bend4


InstalltheAilerons


Step1:Drilla1/1 6 ‐inchholeintothecenterofeachhinge
slotintheaileronandwingpanel.Trimthecoveringaway
fromeachhingeslottoensurethatthehingeswillbe
properlygluedinplace.


Step2:TestfitaCAhingeintoeachofthehingeslots.If
necessary,enlargetheslotswithahobbyknife.When
satisfiedwiththefit,placethehingesintotheslots.Pusha
pinthroughthemiddleofeachhingetokeepthem
centered.


Step3:Jointheailerontothewingpanelandremovethe
pinsfromthehinges.Centertheailerononthewing.


Step4:Adjusttheaileronsothereisasmallgapbetween
theLEoftheaileronandthewing.Thegapshouldbe
about1/6 4 ‐inchorjustwideenoughtoslipapieceof
paperthrough.


Step5:ApplysixdropsofthinCAtothetopandbottomof
eachhinge.Donotuseacceleratorinthehingingprocess.
TheCAmustbeallowedtosoakintothehingenaturally.
AftertheCAhascured,flexthesurfacesseveraltimesto
breakinthehinges.Pullonbothsurfacestomakesurethe
hingesaresecure.

Repeatsteps1‐5fortheotherwingpanel.

InstalltheAileronServos&Pushrods

Beforeinstallation,confirmthattheservosyouwillbe
usingwillproperlyfitintheservoopening.Make
adjustmentsasnecessaryforyourservos.Thepre‐cut
servoopeningsonthisairplanewillfitmoststandardsized
servos.


Step1:Installingtheservosinthewingwillrequirethe
useofaservoextensionwireforeachaileronservo.One
Y‐harnessconnectorisalsorequiredandisusedtoallow
theaileronservostoplugintooneslotinyourreceiver.
Youmayalsohaveacomputerradiothatallowsyouto
plugtheservosintoseparateslotsandthenmixthem
togetherwiththeradiotransmitter.Ifyouchoosetomix
themtogetherwiththeradioratherthanaY‐harness,
refertothemanualforyourparticularmodelradiosystem.


Step2:Attachtheservoextensiontotheaileronservoand
secureitwithheatshrinktubing.Thetubingcanbe
shrunkaroundtheconnectorwithaheatgunormicro
torch.Ifyouraileronservohastabsmoldedintothecase
formountingtheservoonitsside,theymustbecutoffin
orderfortheservotofitintotheservobayinthewing
panel.Followtheinstructionsincludedwiththeservofor
cuttingthetabs.Installtheeyeletsandgrommetsincluded
withtheservo.

CUT OFF
UNUSED ARM
ENLARGE TO
2mm

Step3:Securelytiethestringfrominsidetheopeningfor
theaileronservototheendoftheservoextension.Pull
theservowireandextensionthroughthewing.


Step4:Temporarilypositiontheaileronservointothe
servobay.Installandremoveaservomountingscrewinto
eachofthefourholes.ApplyadropofthinCAintothe
holestohardenthewood.Afterthegluehashardened,
installtheservointotheopening.Cutthreearmsfroma
four‐armedservoarm(armsmayneedtobepurchased
separately).Centertheservowithyourradiosystemand
installaservoarmparalleltotheaileronhingelineas
shown.

Aileron Pushrod
17 mmФ1.8X 0 Nylon Clevis
8mm
The c levis needs to be
secured onto the
pushrod for about 8mm

Step5:Placeoneofthenyloncontrolhornontheaileron,
positioningitasshowninthesketchandaligningitwith
theservoarmusingastraightedgeasaguide.Markthe
locationforthescrewholes.Drillaholethroughthe
aileronatthemarksyoumade.Installandremovethe
screwintoeachoftheholes.Hardentheholeswithadrop
ofthinCA.Afterthegluehashardenedcompletely,secure
thecontrolhornwithtwoscrews.

Fa slin k
Servo Arm
Aile ron Pushrod
17 mmФ1.8X 0
6mm
Ben d t he e nd of the wire in t o a right
angle. Depending on the length of
the wire needed, excess wire can be removed.
Step6:Locatethepushrodwirewiththreadsononeend.
Screwanylonclevisontotherod.Itisrecommendedyou
useaclevisretainer(notincluded)tohelpkeeptheclevis
inplace.Slideasiliconeclevisretainerontothebaseof
theclevis.Connecttheclevistothesecondholeonthe
controlhorn.
Step7:Usetapeorasmallclamptoholdtheaileroninthe
neutralposition.Withtheservoarmstillparalleltothe
hingeline,makeamarkonthepushrodwhereitcrosses
theouterholeintheservoarm.Removethepushrodand
clevisfromthecontrolhornandmakea90degreebendat
yourmark.Cutofftheexcesspushrodwire6mmbeyond
thebend.Enlargetheouterholeintheservoarmusinga
2mmdrillbit.Connectthepushrodtotheservoarmusing
anylonFast‐Link.


Finishthewingpanels


Step1:Withoutusinganyglue,testfitthewinghalves
withthewingjoiner.Makesurethehalvesfittogether
well.Ifthereisaproblemwiththefit,lookfor
obstructionssuchasgluebumpsorwoodsliversinsidethe
wingswherethejoinersfit.Makeanyadjustments
necessarytogetagoodfit.



Step2:Mixagenerousamountof30‐minuteepoxy.Pour
theepoxyintothejoineropeningonthewing.Makesure
theepoxyisdistributedallthewayaroundinsidethe
wings.Useanepoxybrushtocoattherootribsofboth
wingsandonehalfofthejoinerallthewayaround.Insert
theepoxy‐coatedhalfofthejoiner.Wipeawayexcess
epoxyasitisforcedout.


Step3:Coattheprotrudingendofthejoineralltheway
aroundwithepoxy.Jointheotherwing,pressthetwo
halvestogether,allowingexcessepoxytodripoutasyou
go.Whenthewingscometogether,wipeawayexcess
epoxythatissqueezedout,thenuseaC‐clampand
severalstripsofmaskingtapeonboththetopandbottom
ofthewingtotightlyholdthetwohalvestogether.If
epoxycontinuestoworkoutofthewingunderthetape,
removeonestripatatimeandwipeofftheepoxy,then
replacewithanotherstripoftape.Donotdisturbthewing
untiltheepoxyhashardened.


Step4:Locateandremovethecoveringfromthewing
boltholesnearthetrailingedgeofthewing.


Step5:Alignthewingboltplateovertheholesonthe
undersideofthewing.Withthewingboltplatecentered
overtheholes,useasharpiepentotracearoundtheplate
ontothewing.


Step6:Trimthecoveringjustinsideyourlines.Wipe
awaythelineswithalcoholandgluethewingboltplateto
thewing.
Continuethewingboltholesthroughthewingboltplate
witha1/8 " [3.2mm]drillbit.Awoodbackerpiecewhile
drillingwillhelpensureclean‐edgedholesinthewingbolt
plate.


Step7:Whenyouarefinishedinstallingelectronicsinside
thefuselage,youcaninstallthewingontothefuselage
usingtwomachinescrewsandtwoflatwashers.

InstalltheStabilizer


Step1:Locatethehorizontalstabilizerslotunderthe
coveringonthetailsectionofthefuselagebylightly
pressingwithyourfinger.Theslotislocatedonbothsides
ofthefuselage.Carefullyremovethecovering.Makesure
youdonotcutintothewood.


Step2:Locatetheslotfortheverticalfinonthetopof
thefuselageandremovethecovering.Makesureyoudo
notcutintothewood.


Step3:Insertthestabilizerintothestabilizerslotsoitis
centeredinthefuselage(dimensionAshouldbeequal).
Placethewingontothefuselageandsecureitinplace
withthewinghold‐downbolts.Viewtheplanefromthe
rearandatadistanceofafewfeet.Thestabilizershould
beparalleltothewing(dimensionBshouldbeequal).If
not,sandthestabilizermountingbaseslightlytoachieve
theproperpositionofthestabilizer.


Step4:Attachapieceofstringtomeasurethedistance
“A”ofeachstabilizerhalves,and“B”thedifference
betweenthewingtipandthetopofstabilizer.Both
distancesshouldbeequal.


Step5:Withthestabilizerproperlyaligned,useafelt‐tip
pentotracealinearoundthetailoftheairplaneonthe
topandbottomofthehorizontalstabilizer.


Step6:Removethestabilizeranddrawtwoadditional
lines,topandbottom,1.6mminsidethelinesdrawnin
thepreviousstep.Usingaknife,carefullycutthroughthe
coveringalongtheinsidelinesandremovethecovering
fromthecenter.Donotcutthewoodunderthecovering!

Ifthecoveringisnotremovedfromthestabilizer,a
properbondforyouradhesivewillnotbeachieved.

Step7:Mix30‐minuteepoxyandspreadsomeinsidethe
horizontalstabilizermountonthefuselage.Spreadmore
epoxyontothetopandbottomofthestabilizerwherethe
coveringwasremoved.Insertthestabilizerintothe
fuselagefromtherearandadjustthealignmentusingthe
guidelinesthatweredrawnontothestabilizer.Wipeoff
anyepoxythatsqueezesoutusingapapertowel
dampenedwithrubbingalcohol.Recheckthealignment
frequentlywhiletheepoxycures.

InstalltheVerticalFin


Step1:Testfittheverticalfinintheslotinthetopofthe
fuselage.Sandtheedgesoftheslotifnecessarytoobtain
asnugfit.Drawalinearoundtheverticalfinwhereit
meetsthefuselage.Cutthecovering1/16”[1.6mm]
insidethelinesyoudrewontheverticalfinandthetopof
thefuselage.Removethecovering.


Step2:Mixsome30‐minuteepoxyandapplyittothetop
ofthehorizontalstabilizerthroughtheslotandonthe
sidesoftheslot.Applymoreepoxytotheverticalfin
wherethecoveringwasremoved.Inserttheverticalfin
intothefuselageandadjustthealignment.Checkfora90
degreeanglebetweentheverticalfinandhorizontal
stabilizerwhenviewedfromtherear.Usemaskingtapeto
holdtheverticalfininthisposition.Recheckthe
alignmentfrequentlywhiletheepoxycures.

InstalltheElevator

Step1:Findthepre‐cuthingesfromtheincluded
accessories.Testfitthehingesintheslotsintheelevator
halvesandstabilizer.Ifthehingesdonotslideintothe
slotseasily,workyourknifebladebackandforthinthe
slotafewtimestoprovidemoreclearance

OF HINGE SLOT
DEEP IN CENTER
DRILL A HOLE
3/32

Step2:Drilla3/32”[2.4mm]hole,1/2”[12.7mm]deepin
thecenterofthehingeslots.Reinsertyourknifebladeto
cleanouttheslotafteryoudrilltheholes.


Step3:Insertfourhingesintotheslotsinthestabilizer.
Presstheelevatorsontothehingesuntilthegapbetween
theelevatorsandstabilizerisabout1/32”[.8mm].Flex
theelevatorsalittleinonedirection,butdonotallow
themtopullawayfromthestabilizer.Applysixdropsof
thinCAontoeachhinge.Turnthefuselageoverandapply
sixmoredropsofthinCAtotheothersideofeachhinge.
DONOTuseacceleratorwhilehinging,astheCAmust
wickintothehingetoproperlyattachthehinges.Usea
papertoweltoabsorbanyexcessCA.AftertheCAcures,

flextheelevatorsinbothdirectionstofreeupthe
elevatorsforoperation.




Step4:Temporarilyinsertapushrodintotheelevator
pushrodexitslot.Usethepositionofthepushrodtoalign
theelevatorcontrolhornsontotheundersidesofthe
elevatorhalves.Markthelocationsofthecontrolhorn
mountingholesontotheelevatorhalvesanddrillholesat
themarks.Donotdrillallthewaythroughtheelevator
halves!Threadascrewintotheholeandbackitout.Apply
acoupledropsofthinCAgluetotheholeandletitharden.
Attachtheelevatorcontrolhornstotheelevatorsusing
fourscrews.


InstalltheRudderandTai lWheel


Step1:Assemblethetailwheelassemblysetusingthe
includedaccessories.



Step2:Theinstallationtabofthetailwheelneedtobe
mountedonthebottomofthefuselage.Test fitthe
ruddertothefuselagewiththetailwheelassembly
installedintheorientationshown.Makeanyadjustments
necessarysothetabonthetailwheelissecurelyfastened
onthefuse.Roughenthewireonthetailwheelassembly
thatfitsintotherudderwithsandpaperandcleanitoff
withalcohol.Gluethetailwheelwireintotheholeinthe

LEoftherudderwithmediumorthickCAglue.Fitthe
ruddertothefuselagealongwithCAhinges.GluetheCA
hingesinplacewiththinCAglue.


Step3:Asyoudidwiththeelevator,usethepushrodto
temporarilypositionacontrolhornontothesideofthe
rudder.Thensecurethecontrolhornusingtwoscrews.


InstallingtheTailServosandPushrods


Step1:Installtheelevatorandrudderservosintothe
fuselageasshownusingthehardwaresuppliedwiththe
servos.BesuretohardenthescrewholeswiththinCAas
wasdonewiththeaileronservos.Cutthreearmsfrom
twofourarmedservoarms.Centertheservoswithyour
radiosystemandinstallthemontotheservoswiththe
servoscrews.Enlargetheouterholesofeachservoarm
witha5/64"[2mm]drillbit.Dependingonyourbalancing
needs,youcaninstallthereceiverbatteryinthefrontof
thefuselageoratthebackofthefuselage.



Step2:Threadtheclevissecurelyontotherudder
pushrod.Werecommendusingaclevisretainertohelp
keeptheclevisinplace.Slidethepushrodthroughthe
rudderpushrodexitslotinthefuselageandconnectitto
theruddercontrolhorn.


Step3:Withtherudderintheneutralpositionandthe
rudderservoarmperpendiculartothepushrod,mark
wherethepushrodcrossestheouterholeoftheservo
arm.Asyoudidwiththeaileronpushrods,makea90
degreebendatthemarkandcutofftheexcesspushrod
1/4 " [6mm]beyondthebend.Securethepushrodtothe
servoarmwithaFasLink.Makeanyadjustments
necessarytothenylonclevissothattherudderisproperly
centeredandslidethesiliconeclevisretainertotheendof
theclevis.



Step4:Threadtheclevissecurelyontotheelevator
pushrod.Werecommendusingaclevisretainertohelp
keeptheclevisinplace.Slidethepushrodthroughthe
elevatorpushrodexitslotinthefuselageandconnectitto
theelevatorcontrolhorn.


Step5:Withtheelevatorintheneutralpositionandthe
elevatorservoarmperpendiculartothepushrod,mark
wherethepushrodcrossestheouterholeoftheservo
arm.Asyoudidwiththerudderpushrods,makea90
degreebendatthemarkandcutofftheexcesspushrod
1/4 " [6mm]beyondthebend.Securethepushrodtothe
servoarmwithaFasLink.Makeanyadjustments
necessarytothenylonclevissothattheelevatoris
properlycenteredandslidethesiliconeclevisretainerto
theendoftheclevis.



InstalltheMainLandingGear


Step1:Locatethefourblindnutsinthebottomofthe
fuse.Cutthecoveringfromtheinsideoftheholes.


Step2:Mountthealuminumlandinggeartothefuselage.



Step3:Mountthetwowheelaxles.


Step4:Mountthemainwheelstotheaxleswiththe
wheelcollars.

BrushlessMotorandESCInstallation

Step1.Locatethepartsforassemblingtheelectricmotor
mountasshown.


Step2:Mixagenerousamountof30‐minuteepoxy.Next
gluethefoursupporttrianglesontothemotorrail,oneon
eachsideandtop/bottom.Afterthefoursupporttriangles
havebeensecured,gluethemotormountingplateonto
themotorrail.Theplateshouldbesecuredonthetopand
bottombythefourtriangles.Themotormountingplate
hasbeencutsotheyshouldfitproperlybetweenthe
motorrails.Aftertheplatehasbeensecured,gluethetwo
trianglestockontothesideasshowninthephoto.








Step3.Takethemotormountofyourbrushlessmotor,
markthepositionoftheboltopenings.Youwillneedto
drillholesonthemotormountingplateforthosebolt
openings.


Step4.Installthemotormountthatcamewithyourmotor
ontothemotormountingplate.ThenInstallyour
brushlessmotorontothemotormount.Makesurethe
motorspinsfreely.


Step5.InstalltheESCinsidethemotorboxorinsidethe
fuselage,dependingontherequirementforbalancingthe
CG.




Step6.Installthepropandspinner/propadapter.




InstallingtheFuelTank(onlyifyouuse
nitromotor)
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12mm
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Step1:Thefueltankcanbeassembledasatwoline
systemconsistingofavent(pressure)linetothemuffler
andacarbline.Fillingandemptyingofthetankwould
needtobedonethroughthecarbline,oranoptionalfuel
fillvalve.Thetankcanalsobeassembledasathreeline
systemhavingaventline,carbline,andfillline.If
installingafillline,puncturethetopofthestopperabove
thesealedofffueltubehole.Thefillandcarb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.
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To p o f tan k
Ven t
Fill an d carb lin es
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Step2: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
carb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.
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Step3: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.
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InstallingtheNitroMotor(onlyifyou
usenitromotor)
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Step1:Testfityourenginebetweenthewoodengine
mountrails.Checkthepositionoftheenginefor
necessaryoffsets.

117mm
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Step2:Positionthefrontoftheenginedrivewasher
approx115‐120mmfromthefirewall,dependingonthe
engineyouselected.Markthelocationoftheengine
mountboltholesontothemountrailsusingaDead
CenterHoleLocator.Removetheenginefromthemount
railsandcreatethreadsinthefourmountingholes.Attach
theenginetothemount.
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InstallingtheReceiver
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Step1:Secureyourreceiverinsidethefuselage.Then
connecttheservostoyourreceiver.Makesuretheleads
tonotinterferewithanyofthepushrods.
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Step2:Pre‐cutopeningsareprovidedformountingan
on/offswitch.Iftheholespacingdoesnotfityourswitch,
youmayneedtomodifythepre‐cutopening,ormountit
inadifferentlocation.Youcanalsomountanoptional
chargejackreceptaclebelowtheswitch.
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BalancingtheModel
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Afteryouhavefinishedbuildingthemodelintoready‐to‐
flyconditionyoucansettheC.G.ofthemodel.Youneed
tohaveallofthesystemsinstalledbeforeyoubegin,
includingthenitroengineorelectricmotor,landinggear,
radiosystem,andbatterypack.
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TheC.G.islocated64mmbackfromtheleadingedgeof
thewingatthefuselage.
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Thisiswhereyourmodelshouldbalanceforthefirst
flights.Lateryoumaywishtoexperimentbyshiftingthe
C.G.forwardorbacktochangetheflyingcharacteristics.
MovingtheC.G.forwardmayimprovethesmoothness
andstability,butthemodelmaythenrequiremorespeed
fortakeoffandmakeitmoredifficulttoslowforlanding.
MovingtheC.G.aftmakesthemodelmoremaneuverable,
butcouldalsocauseittobecometoodifficulttocontrol.
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Whenbalancingyourmodel,supporttheplaneuprightat
theC.G.positiononthebottomofthewingwithyour
fingersoracommerciallyavailablebalancingstand.Move
thebatteryorreceiverinsidethefuselageasnecessaryso
themodelhangslevelorslightlynosedown.Thisisthe
correctbalancepointforyourmodel.
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Afterthefirstflights,theCGpositioncanbeadjustedfor
yourpersonalpreference.
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SettingControlThrows
Turnonthetransmitterandreceiver.Usearulertoadjust
thethrowoftheelevator,aileronsandrudder.Adjustthe
positionofthepushrodatthecontrolhorntoachievethe
followingmeasurementswhenmovingthestickstotheir
endpoints:
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AileronLowRate
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Up9mm
Down9mm
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AileronHighRate
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Up16mm
Down16mm
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ElevatorLowRate
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Up10mm
Down10mm
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ElevatorHighRate
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Up16mm
Down16mm
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RudderLowRate
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Up12mm
Down12mm
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RudderHighRate
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Up20mm
Down20mm
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Thesearegeneralguidelinesforcontrolthrows.Youcan
experimentwithhigherratestomatchyourpreferred
styleofflying.