Bengtson FOKKER DVII Manual de usuario

FokkerDVII36”

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FOKKERDVII

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R/CScaleModelInstructions

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FokkerDVIIbyBertAyers

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CONTACTINFORMATION

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TheFokkerDVIIwasdesignedbyM.K.Bengtson

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ManufacturedandDistributedby:

BengtsonCompany

e‐mail:[email protected]m

WebSite:www.aerodromerc.com

FokkerDVII36”Page2

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FokkerDVII

ThankyouforpurchasingtheFokkerDVIImodelfor

electricflight.AsemiscaleadaptationoftheFokkerDVII,

thismodelisdesignedtobeeasytobuildandexcitingto

fly.

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POWERSETUP

TheSpeed400motorpowersthemodelandtheMini‐

Olympus2.33:1gearboxanda10x6APCprop.Battery

powerpackcanbe8x600maHNicadsoranequivalent

weightNimh

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SPECIFICATIONS

Morethan200lasercutparts

Scale:  ~1/9

Channels: R/E/A/TorR/E/T

Wingspan: 36ʺ

WingArea: 318sqin

Weight: 25ozreadytofly

PowerSystem:Speed400,Mini‐Olympus2.33:1gearbox

Prop:  10x6

Wheels: Balsa&plywood,Neoprenefoamtires

AirfoilType:Flatbottomed,nearlyscaleshape

Cowl: Builtupbalsa

Spinner:N/A/

Decals: Availableonwebsite

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BEFORESTARTING

Anoteaboutthephotos:Thephotosweretakenofa

prototypeandthepartssuppliedmaylookslightly

differentfromthem.However,theconceptsillustrated

arethesame.RoddPerrinbuilttheprototype.

WINGS

TheDVIIhadanunusualwingprofilelookingfromthe

noseoftheaircraft.Thewingribstaperedinheight

towardsthetipandhadthetopofthewinglevel(the

bottomofthewingcurveduptogiveanapparent

dihedral).Themodel’stopwinghasthecorrecttaperin

theheightoftheribswiththetopofthewingbeing

straightandthebottomtaperingupatthetips.

Similartothebottomwing,thetopwingismadefrom

twopanelswithacentersection.

Thetrailingedgescanbesandeddownversionsofthe

templatessuppliedinthekit.Alternately,use¾”trailing

edgestockandusethetemplatesasaguidetosandthe

scallopsinthebackedge.Apieceofsandpaperwrapped

aroundasuitablecylinderorbottlemakestheperfect

sandingtool.Thismethodsavesalotonsandingtime.

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TopWing

Thetopwingcanbevirtuallybuiltupbeforeanyglue

needtobeapplied.

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TheLeftTopWing

TheplansshowthepartsforboththeR/EandR/E/A

versionofthetopwing(moredihedralintherudder/

elevatorversionanddifferentribsforwheretheailerons

aresituated).

TheaileronsfortheDVIIareonlyonthetopwingandare

relativelysimpletomake.

Apre‐cutwingtip,leadingedgesparandribsmakethe

jobeasy.

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TheLeftAileron

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WingIPStrutAttachmentPointDetail

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FokkerDVII36”Page3

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ThewingIPstrutsarerecessedintoslotsintheupper

portionof1/8”ribs.Somescrap1/8”balsasandedto

matchtheribprofilereinforcestheseslots.

Withtherightandleftwingpanelsfinished,itistimeto

jointhetwoviathecentersection.

Beforejoiningthepanels,aquickcheckwiththesteel

rulertomakesureeverythingisaligned.Sightingdown

thelineofthetopspar(1/16x1/8bass)withthesteelruler

insertedintheholeforthetopspar

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CheckTopSpar

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SightingDowntheLineoftheTopSpar.

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Theaileronjoinsthewingatanangletothetrailingedge.

Thismeansthattheaileronservo,whichneedstobeat

rightanglestothedirectionofaileronmovement,also

needstobeatanangletoavoidbinding,etc.

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LowerWings

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TheLowerWing

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LowerWingSheeting

Theinnertworibbaysaretopsheetedwith1/16”balsa.

Thefinalsandingwillremovethesparextendsbeyond

theendoftherib(sodoesthesheetingforthatmatter!).

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WingsCompleted

Fuselage

Thefuselageisa1/8thbalsaforwardsectionwithabuilt

uptailarea.Thisproducesafuselagethatisbothlightand

strongandiseasytomakestraight.

The1/8thsectionismadefromtwopiecesofbalsa.They

arekeyedtoensurethatthefuselagesidesareassembled

correctly.Thisisespeciallyimportantasthecabanestrut

cutoutsarealreadyinthefuselageside.

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ForwardFuselagePre‐glue

Makesureyouallowthemtodrythoroughlybefore

movingthemfromthebuildingboard.Alightsanding

doneatthisstagewillgetridofanyjointline.A1/32”ply

doublerisnextplacedoverthemiddlesectionofthe

fuselage.

1/32”PlyDoubler

Theplansshowwherethisshouldgo,butitcanbeputin

thewrongspotifcareisnottaken.

Atthisstagealeftandrightsidearemade,somarkeach

sideappropriatelybeforecommittinganygluetothe

model.

Uselightpencillinestomarkwherethedoublerneeded

togotomakesurethatglueisnotspreadeverywhere.

Afterwaitingforthegluetotack,weightbothsidesdown

withleadshotbags(andsomeplasticwraptomakesure

theydon’tsticktogether)forthegluetodry.

Oncethefuselagesidesaredry,theformerscanbe

attachedtooneside.

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RearFormerisBeingGluedtoOneSide

Similarly,thefrontformerisgluedtotherightside.

NoteRoddʹsextensiveuseofweightsandsquarestomake

sureeverythingisalignednicely

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Oncetheglueisniceanddry,thetwosidesarebrought

together.

Addthe1/32”plycabanestrutmountingreinforcements

insidethefuselage.

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1/32”PlywoodCabaneStrutMountingReinforcements

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RearFuselageConstructionDetail

Therearfuselageismadefrom1/8thsquarebalsasticks.

TheDVIIshouldhavethelongeronsmadefromhard

balsa(butnotbulletproofbalsa!).

Thefirstsideisbuiltovertheplan,withthesecondside

beingbuiltoverthetopofittogivetwoidenticalsides.

Bitsofcoveringbackingpreventthesidessticking.

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ScrapBalsatoHoldthe1/8thSquareFlattotheBuildingBoard

Roddusedsomescrapbalsatoholdthe1/8thsquareflat

tothebuildingboardsohedidnothavetopinthrough

thelongeronsandweakenthem.

Witheachsidealignedtotheplan,thecrossmemberscan

starttobegluedintoplace.

Whencuttingthecrossmembers,cuttwoatatimesothey

willbeidentical.Thiswaytheyarebothright.

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RearFuselage

Theblockofbalsaatthetailisforthelandingskid.

Addasmallbitif1/8thsquarebalsa,suitablytaperedtofit

betweenthetwoendpostsofthefuselage,tomakethe

rearjointniceandfirm.

Asthereisamajorchangeintaperintherearfuselagejust

underthetailplane,smallcutsweremadeintotheinside

ofthelongeronswherethechangeintaperislocated.Bits

of1/8thsquarebalsasupportsthejoint.

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MotorMount

Insertthemotormountbeforethefrontofthemodel

becomestoostifftoallowittobepoppedintoplace.The

motormountispre‐cutforaS400Mini‐Olympuswith

somesidethrustalsobuiltin.Makesureitgoesintogive

rightthrust.Theparthasmarkedwhichwaygoesup.

Themotormounthastwowingsoneachside,whichfit

intocorrespondingslotsinthefuselage.

Thecowlsupportcrossmemberisgluedintoplaceafter

themotormountisinstalled.

Withthefrontfuselageessentiallycompleteandtherear

fuselagecomplete,itisnowtimetobringthetwo

together.

Atthisstage,donotaddanyoftheupperformerstothe

frontfuselagetomakeiteasiertosetthingsupflat.

Thefrontfuselageisweighteddowntothebuildingboard

andtherearfuselagealignedintotheslots.

UnlikesomeBritishaircraft,theDVIIdoesnothavea

straighttoplongeron.Bitsfromaroundtheworkshopare

usedtopropuptherearfuselagetogettherightchanges

inslope.Checkthatthestructureissquare.

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RearFuselageDetail

TIP:Putlittlemarksalongthecenterlineofformers,etc

whichwillsignificantlyhelpthejoiningprocess.

Thesecrettoastraightfuselageistoholdoneendfirmly

whileallowingtheotherendto‘float’alittle.Thisensures

thatthepartsdofitintoplacewithouthavingtobeforced

tofit.

Thetopfuselageformersweregluedintoplaceandalso

downtherearfuselagetosupporttheturtledeck.

Roddusedpapertomakeupatemplatetoavoidwasting

balsa.

Thetemplatewasmadeslightlyoverlong,withoneend

15mmwideandtheotherexpandingto86mmwherethe

rearfuselageformerwaslocated.Anyoverhangwas

sandedoffwhentheturtledeckwasgluedtothefuselage.

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FuselageTemplate

Thecowlneedstobeconstructednext.

Thecowlismadefromthreepiecesofbalsa–two1/4”

andone1/8”Thethinonegoesinthemiddle.

Thegearboxmustsitdownonthemotormountingplate,

sorelievethefrontbracealittleandgougeoutasmall

groveinthenosehatch.

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GearboxDetail

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Gearboxinplace

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Cowl

Theradiatorwasthentackgluedintoplaceonthenose

androughlysandedtoshapetomatchtheDVIIdrawings.

Lookingfromthetop,theradiatorshouldhaveashape

approximatelylikeaflatbottom‘v’.



Rough‐SandedNosefromtheSide

FokkerDVII36”Page7

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Toprovidealittlesupport,Roddgluedsomescrapbalsa

intothethinnedareasforadditionalsupport.



BackofCowl,

Note:C1wasincorrectlyplacedupsidedown.

Roddmadehiscowlremovable,althoughthisisnot

absolutelynecessary,itdoesmakeservicingthemotor

easier.PairedNeomagnetsmakeexcellentattachment

holdsforthisapplication.



RadiatorMeshTemplateDetail

Forthemeshcoveringthefrontoftheradiator,thisis

shownontheplansassomewire‐doorscreen.

Tohelpwiththefittingprocess,Roddcutatemplatefor

theholeinthefrontfromsomescrapcardboard



RadiatorMeshDetail

Abitofmeshwascutroughly3–5mmoversizeandthen

bentaroundtheformertogivearoughshape.

Roddusedpull‐pullcontrolsforthetailfeathers,sohe

addedsomesupportsforthewireswheretheyexitthe

fuselage.Hesupportedthewiresusingsomelightbalsaat

theexitpointswiththewiresroutedthroughsmall

aluminumtubestostopthemeatingthroughthefuselage

everytimetheymoved.

TubesMountedandSanded/FiledFlushwiththeSurface

Thepairoftubesisfortheelevatorwhilethesingletubeis

fortherudder.Makesuretoroughupthesurfaceofthe

tubesbeforeyouCAtheminotherwisetheywillpullout.

Thetubeshavebeenbentroughlyintoposition,withthe

finalanglesofthetubeshavingtowaituntiltheservos

andwiresinareinplace.



FokkerDVII36”Page8



FrontofFuselage

Theenginesitsonanotherbitof1/16”sheetthatisslightly

lowered(toroughlythetopofthefuselagesides).Of

course,thismustbefittedbeforeyouaddthetop

sheeting.

TailSurfaces

Thesestructuresarebuiltfromsuppliedlasercutparts

andabitofbuildersuppliedstripstock.



HorizontalStabilizerandElevator

Useslightlyharderbalsaforthetrailingedgeofthe

horizontalstabilizerasthiswouldactasabitofaspar.



Rudder



VerticalStabilizer

Therudderismostlyfromthelasercutsheet,againwith

stripwoodsuppliedbythebuilder.

WHEELS

Gluingtheplysidesonthe3/8”balsacoremakesthebasis

forthewheels.Usethebrasshubforalignment.Epoxythe

hubsinplaceandaddasufficientamountofepoxy

aroundthebaseofthehubtoreinforcetheconnectionof

thehubtotheply.Plywoodreinforcinghubsareprovided

thataretoslipoverthebrasstubingasshown.Next,CA

gluetheneoprenecordingtogethertofroma“tire”.Use

thinCAsparinglyastheCAbondsveryaggressivelyto

therubber.PresstheCAwettedendstogetherforan

instantbond.Thebestwaytoaligntheendsistoglue

themwhiletheyareinplaceonthewheel.Thenattachthe

tirestothewheelsandCAinplace.AthinbeadofCA

aroundtherimmakesforasecuretire.

Paperconesarecutout.Useaballpointpentoscoreeach

lineonthebacktomakeanimpressionof“spokes”Itis

helpfultodothisoperationonapapertabletsothatthe

penmakesagoodcrease.Foldthepaperalongthecrease

linestoexaggeratetheraisedlines.Oneofthesections

formingawedgeiscutout.Makecutstothecenterofthe

circlealongapairofthespokes.Closethepapercutoutto

formaconeandtapethejointinsidethecone.

Theinsideconesmaynowbeattachedtothewheels.The

outsideconesmaybeattachedatthispointifwheel

collarsaretobeused.Alternatively,afterinstallingthe

wheelsonthelandinggear,awashermaybesolderedto

holdthewheelinplaceandthentheconeisattached.This

methodmakesaverynicescaleappearance.

FokkerDVII36”Page9



CompletedWheel

Thewingstrutsaremadefrom¼x1/8spruce/bass/etc.

Cutoutthethreesectionsaccuratelytotheplansandthen

gluedthemtogetherovertheplans.

Makesurethatbothstrutsarethesame.

Aftereverythingisaligned, these need to be sanded

into roughly an airfoil shape.



IPStrutConstructionDetail

Thecabanesareaddedduringassembly.Thebottom

wingsareattachedfirst,withoutthelandinggear.Thetop

wingsarethenattachedusingtheIPstruts.Thisusually

putsthetopwingprettyclosetothecorrectalignment.An

alignmentjigmadefromfoamboardholdsthetopwing

inalignment.Thejigisa~rectangularpiece tofitbetween

thetopofthefuseandbottomofthewing.Itistaken

directlyfromthesideview.Thedeviationfrom

rectangularisduetothetopwingʹsincidence.Thenlength

ofthecabanesisthenadjustedtofitthemodel.Eachpart

issandedandmatchedinlengthtotheoppositepart.

Epoxythepartsinplace.

Theundercarriageismadefromthreebitsof1/16”wireto

theshapesshownontheplan.

Withabitofplanningandsomecarefulmeasuring,itis

nottoohardtogetsomesymmetricallybentbitsofwire

readytobesolderedtogether.

Tohelpwiththesoldering,Roddmadeanundercarriage‐

solderingjig.

Bymeasuringfromtheplansthespacingandalignmentof

thevariousbits,theundercarriageisclampedtothejig

andthejointscleanedwiththewirebushontheDremel.

Withthejointsniceandshiny,abitofwirebindsthe

joints.Solderusingplentyofheat.Alternatemethod:lash

thepartstogetherwithKevlarthreadandCAglue.Finish

thejobwithepoxy.



UndercarriageConstructionJig



UndercarriageWingParts

AveryprominentfeatureoftheDVIIwasthe

undercarriagewing.

Theplandesignedthewingtobebuiltoverthewire

undercarriage,sothereareslotsinthebottomoftheribs

toallowtheaxletopassthrough.Thetopslotsarefora

FokkerDVII36”Page10



1/8”squarespar.Thebottomofthewingis1/8”balsa.

Herearethebasicundercarriagewingparts.Alignment

linesfortheribshavebeenmarkedonthebottomplate.



CompletedUndercarriageReadyforSandingandCovering

INSTALLINGTHERADIOCONTROLGEAR

AileronServos

Aileronservosaremountedinwingandattachedwith

shortthreadedrodstotheailerons.Note:Usea“Y”

wiringharnessconnectortowiretheservostoasingle

radioconnection.

BatteryTray

Afteralltheabovehasbeenplaced,mountthebattery

traymadefrom1/8”balsaandusethebatterypositionto

balancethemodelasshownontheplan.



ASSEMBLY

Withthemodelflatonthebench,usethelocatingdowels

toassistwithaligningthebottomwingpanelstothe

fuselageandepoxyinplace.Thecabaneandinterplane

strutsareaddednextfollowedbythetopwing.The

alignmentofthetopwingistobecheckedbutmainlypre‐

determinedbythesestructures.

FittingtheTailSurfaces

Glueonthetailsurfacesnextmakingsurethattheyare

straightandtrue.Thereisaslotinthehorizontalstabilizer

forthetabontheverticalstabilizer.Ifpushrodstyle

controlsareused,cutandbendtherodsfirstwiththe

controlhornsdryfittedinplace.Thenwhentheservosare

centered,gluethehornsinplace.



ModelintheBones

COVERING

Almostanylightweight‐coveringmediumwillbefine,but

avoidanythingthatislikelytowarpthestructure.

Althoughpaintshouldbekepttoaminimuminorderto

saveweight,normalhobbyenamelswilltakewellto

Litespan.

Ifyouintendtoaddextradetailtoyourmodel,bevery

carefulnottooverdothings.Alittledetailcanvery

quicklyaddalotofweight.

Downloadabledecaloutlinesareon‐lineat

http://www.aerodromerc.com/decals.htm

ThemodelshouldROGonpavementorhardsurfaces.On

grass,themodelmayrequirehandlaunching.Becareful

thatyourhandorfingersdonotcatchonthelower

rigging.Launchfirmlyandlevel.Whilethetailsurfaces

aresmall,theyshouldnotneedexcessivethrows.Letthe

modelgainaltitudeslowlyofftherunway.Applyingtoo

muchupelevatoratslowspeedsasksforastall.Make

yourturnsgentlyastightturnsrisktipstallinginany

model.Don’texpecttheelevatortomakethemodelclimb.

Thinkoftheelevatorasadevicetochangetheattitudeof

themodel.Thewingandairspeedultimatelymakethe

modelclimb.Oftendownelevatorappliedatstallingcan

avoidamajorcrash.Themostimportantdetailsfor

properflightoperationsare:

1.CGlocation.Tail‐heavymodelsneverflywellor

atall.

2.Downandrightthrust

3.Straightandnon‐warpedwings.

CONTACTINFORMATION

Distributedby:

BengtsonCompany

e‐mail:[email protected]

WebSite:www.aerdromerc.com

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