AerodromeRC Fokker DVI User manual

FokkerDVI35.5”

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Fokker DVI 35.5” 1/8th Scale

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R/CScaleModelInstructions

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CONTACTINFORMATION

DesignedbyM.K.Bengtson

Prototype:ChrisBaum

Model:RichardDery

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ManufacturedandDistributedby

BengtsonCompany

e‐mail:[email protected]

www.aerodromerc.com

FokkerDVI35.5”Page1

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FokkerDVI35.5”1/8thscale

ThankyouforpurchasingtheFokkerDVI35.5”1/8th

scalemodelforelectricflight.

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ModelbyRichardDery

ModelSpecifications

Morethan240lasercutparts

Scale:  1/8th

Channels:  R/E/A/T

Wingspan:  35.5”

WingArea:  400sqin

Weight:  ~25ozreadytofly

PowerSystem: MPJet3.46:1BBGearboxLong

CanSpeed400ORAXI2217BL

motor

Prop:  10x7

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

tires

AirfoilType: Flatbottomed

Cowl:  Builtupbalsaandplywood

Spinner: N/A

Designer:  M.K.Bengtson

Prototype: ChrisBaum

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BUILDINGTHEMODEL

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.

WINGS

Buildthetopwinginthreepieces.Notethatthetrailing

edgesare1/32”plywoodandaresuppliedinthekit.Theleading

edgesarelasercut1/4”balsa.Thecabanemountsaresockets

formedbyepoxyingshortlengthsofbrasstubinginthecabane

mountingribs.

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Putsmallscrappiecesof1/8”balsaonthenotchesintheribs

thatacceptthecabaneandIPstrutstoserveasreinforcements

andasabaseforcoveringlater.Theslottedsparsaligntheribs

sothattheyareinatrueverticalorientationwhenthewing

panelsareinraisedintoposition.

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Theforwardsparalsoservesasanattachmentpointforthe

tabsofthesawtoothshaped1/32”plywoodleadingedge

extension.

Thisisascaleaswellasstrengthenhancementinthedesign.

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Buildtheaileronsandsandtheleadingedgetoshape.

Choosearoundedshapeforcenterhingingorabevelledshape

fortophinging.

Finishedlowerwings:

Finaltopwingassembly

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Aileronservosareattachedwithshortthreadedrodstothe

ailerons.Aileronservosarefitinservocompartmentslocatedin

thelowerwingswiththesupplied1/32”plywoodservocovers.

Routeservowiresthroughholesinlowerwingribs.Usea“Y”

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

connection.Alternatively,twoRCchannelscanbeusedwhen

mixedelectronically.Ifdifferentialaileronthrowsaredesired,

rotateeachservohornforwardabout20degrees,while

maintainingtheneutralpositionoftheaileron.Thisshould

counteranyadverseaileronyaw.

FUSELAGECONSTRUCTION

Thefuselageisbuiltastwoseparateboxstructures,thefront

sheetareaandtherearbuiltupsection,whicharethenjoined

overtheplan.Thissystemnotonlykeepseachstagesimple,but

italsohelpstoensureastraightfuselage.Somemodelersprefer

tobuildeachsidecompletelyontheplanandthenjoinboth

halvesoverthetopview.Bothsystemshavetheiradvantages

anddrawbacks.Thefollowingisthefront/backmethod.

Beginbybuildingtworearfuselageframesovertheplanand

allowtodry.Selecthardbalsaorlaminatedbalsaforthe

longerons.Adddiagonalsforarigidstructure.Repeatwiththe

otherside.Somebuildersbuildthesecondsideoverthefirstto

insuretheymatchperfectly.BesuretousewaxpaperorSaran

Wrapbetweentheseoryouʹllnotbeabletogetthemapart.Join

thesidesoverthetopviewoftheplanandaddthecross

membersandtailskidmount.Checkandcheckagaintoinsure

thatthestructureissquareandstraightoryouwillendupwith

abananafuselage.Finallyaddthewedgeshapedhorizontal

stabilizersupports.Waituntilthefrontfuselageisjoinedtoadd

theturtledeckformersandstringers.

Buildthefronthalfanddecking

Laythefrontsidesontheplanandgluethemtogether.The

alignmentnotchinsuresthattheymateproperly.Ontheinside

surfacesgluethe1/32”plywooddoublers.Useaheavyweight

andslowsettinggluelikeepoxy.Ifawaterbasedglueisused,

warpingmayoccursoallowthegluetodryundertheweight.

JointhesideswiththefrontF1andbackF3formersand1/8”ply

undercarriagemountcrossmembers.Addthedeckingandtop

formers,andcarefullytrimtosizeandfit1/16”sheeting.The

sidecheekscanbeaddedafterthefrontandbackofthefuselage

arejoined.Theribshapedpartsthatframethelowerwingroot

locationaretheretosupportthecoveringmaterial.

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CabaneStruts

Thecabanestrutsarefashionedusing1/16”diametermusic

wirebendasshownontheplans.Addbalsafairingsatassembly

time.Thetopofthecabanesformabarthatfitsintoslotsinthe

wing.Balsa,bassorscrapplywoodcanbeusedtofairthe

cabanes.

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TAILSURFACES

Layoutandgluepartsofthetailsurfacesontheplans.

Sandthetailparts,roundingoffalledges.Don’taddthe

hornsorhingethesurfacesuntilaftercoveringiscomplete.

LANDINGGEAR

ThelandinggearisfashionedfromCAhardened1/8”

plywood.Sand,soakwiththinCAandthen,securely,epoxythe

geartothemodel.0.045”musicwireisusedtoreinforcethe

gear.UseKevlarthreadorstrongcarpetthreadandsecurethe

wirealongthegear.CAinplace.Ashockabsorbingmechanism

hasbeendesignedtoletthemodelhavealittlegivewhen

landing.Attachthe3/32”musicwireaxletothetopsideofthe

LGcrossmemberwithKevlarthreadandepoxyinplace.Small

holesareplacedinthisparttofacilitatethelacingofthisthread.

Addshortpiecesof1/8”brasstubingasbearings/spacersforthe

wheels.Userubberbandstoactasshockabsorbersbutmake

eachsideexactlyastheoppositesite.Otherwise,theshock

resistanceisunequalandyourmodelwillcanttoonesideon

everylanding.AddingKevlarcrossriggingwilldramatically

strengthenthelandinggear.

COVERING

Anylightweightcoveringmaterialcanbeused.Polyspan

withdopeorMinwaxPolycrylicmakesagoodchoice,Litespan

isalsopopular.

Decaloutlinesforthismodelareavailableon

www.aerodromerc.com/decalsinAdobeAcrobatpdfformatfor

printingoutondecalpaper.

WindsockDatafile“FokkerDVI“publicationhasdetailson

placementandmarkings.

Availableat

http://www.byrdaviationbooks.com/

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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.

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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.

Underwing

Theunderwingisbuiltaroundtheaxlewitha1/8”balsa

leadingedgeanda1/8”balsabottomwithribs.Ifdesired,sheet

thetopwith1/32”balsainsteadofleavingitopentocover.Be

carefultosettheincidencecorrectly.Theunderwingaddssome

lifttothemodelinflight.

COWLING

Thebackpartofthecowlingisofbuiltupconstructionusing

C1andC2and1/32”plywood.Theholesareforthelocating

dowelsthatextendfromthefirewallformerF1.(Alternatively,

twoofthesecanbeenlargedandusedasmountingholesforneo

magnets.)Constructthefrontpartofthecowlbygluing

C3,C4,C5partsmakingsurethattheyarealignedproperly.

Makeacardboardtemplatefromtheplanasaguideforsanding

thebalsaintoshape.

Thecowlshouldnowbesealed,sandedandprimeduntilno

woodgrainisleftshowing.Baby(Talcum)powderincleardope

makesanexcellentbalsasealer.

Talcumpowdermixedinwhitegluemakesexcellentfiller

forgapsorgouges.Sanddownafteritdries.

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DUMMYMOTOR

ApartialDummymotorisincludedinthekit.Itisthepart

thatisvisibleunderneaththecowling.Makeupthecylinders

usingcardstockandoptionallyusethedoublethreadmethodof

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attachingthreadtotheoutsideofthecylinderstosimulatefins.

RemoveonethreadafterwindingandCAtherestinplace.

FittingTailSurfaces

Attachtheruddertotheverticalstabilizerusing1/8”stripsof

CAhinges.Similarly,attachtheelevatortothehorizontal

stabilizer.Gluethehorizontalstab/elevatorassemblyontothe

fuselage.Thengluetheverticalstabilizerandrudderassembly

intotheslotinthehorizontalstabilizer.SincetheFokkerDVI

hasaveryshortnose,pullpulltailsurfacecontrolsare

mandatory.

AileronServos

Thismodelusesinwingservosmountedon1/32”plywood

servocovers.

NOTE:Chrisdecidedonaninternalpullpullaileronlinkage

instead.

Afterassembly,connecttopaileronstobottomaileronswith

1/16”musicwirepushrods.Connectthemtothe1/16”plywood

controlhornsfittedinthebottomoftheaileron.

Rudder/ElevatorServos

Apull‐pullsetupforconnectingthesecontrolsurfacestothe

servosisrecommended.Connectthemtothe1/16”plywood

controlhornsfittedintheelevatorandrudder.



FittingtheRiggingWires

UsestrongthreadorKevlarfishinglineorelasticbeading

cordingtosimulateriggingwires.Usesmallscrews,fishing

hookeyes,straightpinheadsorsmalleyeletstoattachthelines.

These“wires”canaddadegreeofstrengthtoyourmodel.

Batteryhatch

Fashionabatteryhatchfrom1/32”plywood

ASSEMBLY

ThelowerrootriblocatingholesprecutIParedesignedto

makealignmentofthetopwingeasy.Firstattachthelowerwing

tothefuselage.Thisisbestdonebeforethelandinggearis

permanentlyattached.Takethedimensionsfromthesideview

ontheplanandmakeafoamboardtemplatetosupportthetop

wingontopofthefuselage.Whentheepoxysetsforthelower

wings,insertthesandedandpaintedIPstruts.Inadryfit

processaddthetopwingandtheninsertthecabanewiresand

testforfit.WhensatisfiedepoxytheIPstrutsandaddadropof

CAintothecabanemusicwiremountstosettheminplace.

BalancingtheModel

Balancethemodelatthepointshown.Choosingalarger

batteryispreferredtoaddinglead.

HereisChrisBaumʹs“inthebones”shotoftheFokkerDVI.

FLYING

1.ThemodelshouldROGongrass,pavementorhard

surfaces.

2.Letthemodelgainaltitudeslowlyofftherunway.

3.Applyingtoomuchupelevatoratslowspeedsrisksa

stall.

4.Makeyourturnsgentlyastightturnsrisktipstalling

inanymodel.

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

6.Thinkoftheelevatorasadevicetochangethe

attitudeofthemodel.

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

climb.

8.Oftendownelevatorappliedatstallingcanavoida

majorcrash.

Themostimportantdetailsforproperflight

operations:CorrectCGlocationandStraightnon‐warped

wings.

CONTACTINFORMATION

Distributedby:BengtsonCompany

e‐mail:[email protected]

WebSite:www.aerodromerc.com

Table of contents

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