Bengtson Company FOKKER EIII User manual

FokkerEIII
Copyright©2007M.K.BengtsonAllRightsReservedRev07/11

FokkerEIII
or
FokkerEIIIEZ1/6Scale


R/CScaleModelInstructions






CONTACTINFORMATION
DesignedbyM.K.Bengtson
PrototypebyBrianAllen

ManufacturedandDistributedby:
BengtsonCompany
e‐mail:[email protected]
www.aerodromerc.com

FokkerEIIIPage1


Copyright©2007M.K.BengtsonAllRightsReservedRev07/11
Thankyouforbuyingthe1/6th scale AerodromeRC
FokkerEIII
OR
FokkerEIIIEZBuildVersion
NOTE:Thismanualisforboththestandard
AerodromeRCFokkerEIIIandEZBuildversions.The
differencesarenotedabove.Also,Briandeviatedfromthe
designinmanyareasasindicatedinthefollowingmanual
takenfromhisbuildcomments.Themodelcanbebuilt
accordingtotheplanconsiderablysimplerandlighter.
However,forthosedesiringadetailrichmodel,Brianʹs
modificationsareincluded.Eventhoughtheresulting
modelwasheavierthandesignedfor,itstillfliesvery
well.
ModelSpecifications
Scale:1/6th
Wingspan:66ʺ
WingArea:712Sq.inwingarea.
Weight:~48Oz.
PowerSystem:AXI2820DirectDrivebrushlessmotor
Prop:15X6prop
AirfoilType:FlatbottomedfortheEZbuildversion,
Undercamberedforthestandardversion
Channels:R/E/A/T
Covering:BalsaandLitespanorPolyspancovering
Cowl:Builtupbalsaandplywood
Wheels:balsaandplywoodwithNeoprenefoamtires
forthestandardversion,spokewheelsforthestandard
version.Separatemanualforspokewheelsisincluded
withstandardkit.
Features:Self‐aligningwingsforfast,accurateassembly
PrototypeBuilder:BrianAllen
Designer:M.K.Bengtson

FUSELAGE
Idecidedtostartonthefuselage.Thesidesaremadeup
ofalasercutpieceof3/16ʺbalsaanda1/32ʺplydoubler
forthefrontandastickbuiltaftendfrom3/16ʺsquare
balsa.Thefirstthingtodoistogluethedoublerstothe
balsasides(makingsuretomakeonerightandoneleft).
Whenthisisdonethesidesarepinnedtotheplanandthe
aftsectionisbuiltusing3/16ʺbalsaand1/8ʺbalsaforthe
diagonals.


Balsafuselagesideanddoublergluedtogether.Makeone
leftandright!!

Thedesignerincludeslasercutpiecesof3/16ʺbalsaand
1/8ʺbalsatomaketheseparts.Ihadafistfulof3/16ʺsq
balsainmywoodstocksoIusedthose.Ididnothaveany
1/8ʺsquarebalsasoIusedsomescrappiecesof1/8ʺx
3/16ʺbalsaIhadlayingaround.ThereasonIdidnotuse
thelasercutpiecesof3/16ʺand1/8ʺsqbalsaprovidedwas
duetothefactyouneedtoglueseveraltogethertogetthe
properlength.Iwasjustlazyanddecidedtoraidmy
woodstash.

Ibuiltthesecondsidedirectlyontopofthefirsttoinsure
thattheyareidentical.Whencompleted,Isandedboth
sidessmoothandcheckedallthegluejointsandreglued
asnecessary.




Thewingsarebuiltupontwocarbonfiberorfiberglass
1/4ʺodtubes.Ihadsometroublelocatingcarbontubesso
Ipurchasedanumberof1/4ʺ(.248ʺactualOD)fiberglass
tubesfromakiteshop.Thetubesextendpasttherootrib
ofeachpanelandintothefuselage.Thetubesareinserted
intotwo9/32ʹODbrasstubesthatextendfromfuselage
sidetofuselageside.Wherethetubesglueintothe
fuselagesidesthereareplywoodreinforcementrings

FokkerEIIIPage2


Copyright©2007M.K.BengtsonAllRightsReservedRev07/11
gluedinplaceontheinsideofeachfuselageside.There
aretwoperside.Iinsertedasectionof9/32ʺbrasstube
intoeachholeasaguideandthenslidthereinforcement
ringinplaceandgluedit.



Thefirewallconsistsoftwopiecesof1/8ʺliteplythatare
gluedtogether.ThiswasdoneusingmediumCAwith
carrytakentoinsurethatthetwopartsarelinedup
correctlywitheachother.



Firewallpiecesgluedtogether.

LANDINGGEARMOUNTS
ThelandinggearontheEIIIisaninterestingpuzzleof
parts.Iwouldrecommendstudyingtheplanscarefullyas
ittakesabitofponderingtogetthewholethingfigured
out.Itconsistsonamaingearof1/8ʺmusicwireanda
numberofsupportingpiecesof3/32ʺmusicwire.Timeto
bugmybuddyRonwhohasthebigK&Swirebenderto
getreadyforsomebending.


The3/32ʺwirepartspluginto1/8ʺODbrasstubesthatare
epoxiedinplaceintwoLGmountsonthebottomofthe
fuselage.Thesearemadeupofseveralpiecesof1/8ʺlite
plyandasectionof1/8ʺODbrastube.



Therearmountconsistsofthreepiecesofliteplyandthe
brasstube.Thetwosmallerpiecesaregluedtothelarger
oneseparatedby1/8ʺ(useapieceof1/8ʺmusicwireor
brasstubeasaspacertogetthepieceslocatedproperly).

FokkerEIIIPage3


Copyright©2007M.K.BengtsonAllRightsReservedRev07/11
Whenthepiecesareglued,the1/8ʺODbrasstubeiscutto
lengthandepoxiedinplace.

Thefrontlandinggearmountismadeupinasimilar
fashionastherearwithaninterestingtwist.Thelower
sectionconsistsofthreepiecesof1/8ʺliteplyandalength
of1/8ʺodbrastube.Itisgluedupinthesamemannerand
thetubeepoxiedinplace.Thetopsideofthismountalso
hasaliteplystructuretoholdthemain1/8ʺmusicwire
gear.Itconsistsofonepieceof1/8ʺliteplythatisgluedto
thetopsideofthefrontmount,twopiecesof1/8ʺsquare
liteplytoformachannelandatoppieceof1/8ʺliteply.
Thetwopiecesof1/8ʺsquareliteplyaregluedtothe
pieceonthetopsideofthemountspacedapart1/8ʺ(usea
pieceofmusicwireorbrasstubeasdescribedpreviously
asaspacer.Thelandinggearwillthenbeepoxiedinplace
andthe1/8ʺliteplycapaddedandthewholeshebangis
thengluedintothefuselage.Ithastobedoneinthisorder
sinceoncethemountisgluedintothefuselageyoucannot
getthegearwireinplace.Ithastobeinplacebeforethe
mountisgluedintothefuselage.



Theriggingwirepylonmountismadefromtwopiecesof
1/8ʺliteplythataregluedtogether.

Aftergluingupthefirewallitistimetogetthefront
sectionofthefuselageassembled.Thefirewalland
formersF3andF4areallthesamewidth.SoIlaidthe
rightfuselagesideonthebenchandgluedthefirewall
assemblyandformerF3inplaceaftercheckingtoseethey
wereperpendicularandsquaretothefuselageside.After
that,thebottomformerF4isgluedinplace.Thisformer
goesfromtherearlandinggearblocktoF3.Oncethese
partsaregluedinplacetheleftsideinplacedonthe
fuselageassembly,checkedeverythingninewaysto
Sundaytomakesureallwasalignedproperlyandglued
itup.





FokkerEIIIPage4


Copyright©2007M.K.BengtsonAllRightsReservedRev07/11




AfterthetwofuselagesidesaregluedtogetherIadded
some3/8ʺtrianglestocktothefirewall/fuselagesidejoint
toreinforcethisarea.



Therearlandinggearblockassemblyisgluedinplace
next;makingsureitisevenandlevelwithformerF4.3/8ʺ
balsatrianglestockisaddedontheinsidetoreinforcethis
area.

NotethatIhavegluedtheblockinbackwards,thewide
pieceonthebottomshouldbefacingtherear,notthe
front.Thisisnotarealproblem,asIwilljusthaveto
readjustthewirepartsofthelandinggearabit.Watchthe
orientationoftheLGblocksoyoudonotmakethis
mistake.Gottapayattentionandstopwatchingthe
HistoryChannelwhileIbuild!!



Trianglestocktoreinforcethisarea.



ThetwoformersF2andthelaminatedplypylonsupport
arenextgluedinplaceonthetopsideofthefuselagein
theirrespectivenotches.

FokkerEIIIPage5


Copyright©2007M.K.BengtsonAllRightsReservedRev07/11


Ihaveplacedtheplansheetwiththetopviewonthe
buildingboardandpinnedthefuselagedowntoit.The
nextstepistocutallthe3/16ʺsqcrosspiecesandglue
themandformersF6andF7inplace.

WhilesortingthroughthesheetsoflasercutpartsInoted
thatIhadasecondF4.Afterwonderingforashortwhile
whythereweretwoofthemIlookedattheplansandsaw
thatthesecondonegetsinstalledonthetopofthe
fuselage.Alwayspaystolookcloselyattheplans.Ihave
thusgluedthesecondF4inplaceonthetopofthe
fuselage.



Thebackendofthefuselageisthenputtogetherusing
sectionsof3/16ʺsqbalsastickscuttolength.Iused
severalT‐squarestolocatethesidesproperlyoverthetop
viewoftheplansandtoinsurethatthesideswere
perpendiculartothebuildingboard.Afterthe3/16ʺsq
sticksareinplace,formersF6andF7aregluedinplace.
F6isgluedonthebottomsideofthefuselagewhilethe
twoF7ʹsaregluedonthetopandbottomside.










FokkerEIIIPage6


Copyright©2007M.K.BengtsonAllRightsReservedRev07/11
FormerF6gluedinplaceonbottomrearoffuselage.



TwoformersF7gluedinplaceatendoffuselagerear.

UponcompletionofthefuselagerearareaIdecideditwas
atadbitwhippy.Iinstalledsomediagonalsonthetop
andbottomsidesusingapieceofsoft1/8ʺx3/16ʺbalsato
helpstiffenuptherearofthefuselage.Veryeffective.



IforgottoinstallthetwoF10piecespreviously.Theyare
gluedinplaceatthetailonthesidesofthefuselageand
servetostiffenupthebackend.



Wingconstructiontime.Thedesignconsistsofanumber
of3/32ʺbalsaribsandalitplyrootribwithtwo1/4ʺ
carbonfiberorfiberglasstubesasthesparsanda3/8ʺ
diameterhardwooddowelorcarbontubeastheleading
edge.Ihadtroublefindinganyreasonablypricedcarbon
fibertubessoIusedsome1/4ʺfiberglasstubesthatIgot
fromaKiteShopcalled“IntotheWind”.Theyhaveaweb
siteandIorderedthemrightoffthesite.Theyareactually
.248ʺODbutthatiscloseenough.

Thetrainingedgeismadefromtwopiecesoflasercut
3/16ʺbalsathathavealongscarfjointthatrequiregluing.
Ipinnedalongmetalstraightedgetotheboardtokeepit
frommovingandthenpinnedthetrailingedgepiecesup
againstthestraightedgetoinsurethattheywerestraight,
thenglued.Ithenpositionedthestraightedgealongthe
trailingedgepositionontheplansandpinnedthetrailing
edgeinplace.



Afterremovingthewingribsfromthesheetsandsanding
offthesmallholdtabs,youthreadthemontothetwo
spars.Thenstartingwiththemostoutboardrib,theribs
arelocatedinposition,checkedforverticalwithasmall
triangleandthengluedtothetrailingedgeandthespars
usingthinCA.ThethinCAseemstoholdwelltothe
fiberglassspars.OncetheribisgluedinplaceIthen
pinnedeveryotherribtotheboardtokeepthewhole
shebangfrommoving.Eachribispulledawayfromthe
stackandlocatedandgluedinplace.Makesurethatthe
properribsarelocatedattherootendofthepanel;oneis
slightlysmallertoaccommodatethesheeting.Checkthe
ribnumberscarefully.Itisimportantthattheliteplyroot
ribbeaccuratelylocatedinplacebothperpendicularto
thetrailingedgeandtheboardtoinsurethatthepanel
willmateproperlytothefuselage.

FokkerEIIIPage7


Copyright©2007M.K.BengtsonAllRightsReservedRev07/11




Afteralltheribsaregluedinplacetheleadingedgeis
added.Iusedapieceof3/8ʺhardwooddowel,asIwas
unabletofindany3/8ʺcarbontubethatdidnotcostand
armandaleg.At$.75eachthehardwooddowelsarea
buy.

Thedowelfitsintoalasercutroundnotchonthefrontof
eachribanditisgluedinplace.RibR0isaddedatthe
rootribalongwithgussetR8andtheleadingedgeis
sandedtomatchthecontourofR0.

Oncetheleadingedgeisgluedinplacethesubribsare
installedandgluedinplace.










FokkerEIIIPage8


Copyright©2007M.K.BengtsonAllRightsReservedRev07/11
Thewingtipismadefromthreelaminationsof1/16ʺ
balsa.Theyaregluedtogetherandthewingtipisgluedin
place.Whengluingthefrontofthetiptothelastwingrib
Iusedasmallshillofabout3/32ʺto1/8ʺthickatthevery
frontofthewingtip.Thissetsthefrontofthewingtipat
justaboutthecenterlineofthewingleadingedgedowel,
whichIthinklooksbetter.Therearwingsparneedstobe
notchedatthelastwingribtoallowittodroptocontact
thewingtipeasily.Iusedafinetoothedsawtocuta
notchintothetubeatthelastribandthenbentitdown
andglueditinplaceintothenotchinthewingtip.



WhenthetipisgluedintheplacepiecesR2andR5are
thengluedinplace.Thetipisthensandedroundonits
edgeandthelastwingribandtheleadingedgedowelare
sandedandblendedintothewingpanel.



Thewingpanelsareheldagainstthefuselagesidebytwo
8‐32boltsandaccompanyingblindnutsinthewingpanel
rootribs.Thesewereinstallednextalthoughtheyshould
havebeeninstalledpriortothestartofthewing
construction.Ijustforgottodoit.Therearelasercutholes
intherootribsandeachfuselagesidefortheboltsand
blindnuts.

Dependingonwhosebrandofblindnutsyouareusing
the1/8ʺliteplyrootribmaybetoothintoallow
installationoftheblindnut.Ihadtoaddtwospacers
madefromscrapsof1/8ʺliteplytomakeupthethickness
oftheblindnut.Theseweregluedinplaceontherootrib
andtheblindnutholesredrilled.Theblindnutswere
theninstalledandheldinplacewithsomemediumCA.



Oncetheblindnutsareinstalledthewingpanelissheeted
onthetopsidebetweentherootribandthefirstfullrib
using1/16ʺbalsa.




FokkerEIIIPage9


Copyright©2007M.K.BengtsonAllRightsReservedRev07/11
Eachpanelhaseightwingwireriggingpointsthatare
madefromsomelasercut1/8ʺliteply.Therearefourlong
piecesthataregluedinplaceovertherearspar(twoon
topandtwoonthebottom)andfourshortpiecesthatare
gluedinplaceoverthefrontspar(twoontopandtwoon
thebottom).Thesearetheattachmentpointsfortheflying
andlandingwires.



Ididsomeworkonthewingpanelsandfuselagecarry
throughs.Thefiberglasstubesthatareusedforthewing
sparsexittherootrib.Theyneedtobetrimmedsothey
canfirintothebrasstubesinthefuselagethatlocatethe
wings.Thefiberglasstubesaretrimmedtoalengthof
about2ʺto21/2ʺfromthefaceoftherootrib.

Thefuselagehastwo9/32ʺbrasstubesthatareinstalled
fromsidetoside.Thefiberglasstubesthatexittoewing
panelrootribsslidintothesebrasstubesandthepanels
areretainedbytwo8‐32bolts.

Thetubesaremeasuredandcuttolengthandtheinside
ofeachtubeendisdeburredusinga#11Exacto.Thetubes
arethenslidintothelasercutholesineachfuselageside
(andthewashershapedreinforcements)andaresecurely
epoxiedinplace.Whendry,thepanelsarethenslidinto
thetubesandtheretainingscrewsdraweverythingup
tightandsnug.

Ihavenotyetepoxiedthetubesinplace.Iwillleavethem
looseuntilIcancheckalltheanglesanddanglesandthe
incidenceofeachpanel.ByleavingthemlooseuntilthenI
canmakeanyfineadjustmentsneeded.Asthingsarenow
theylookgoodfromthegitgo.



MyflyingbuddyRonhasbentupalthewirepartsforthe
mainlandinggear.AK&Swirebendercomesinreal
handyhere.SowithpartsinhandIdecidedtogetstarted
onthelandinggear.

Themaingearisepoxiedintothemainlandinggear
block,whichisthenepoxiedintothefuselage.Thefront
pieceL2slipsintothebrasstubethatisalreadygluedinto
themaingearblockandheldinwithabitofepoxy.

Youmusttrailfiteverythingfirsttomakesurethat
everythingfitsproperlyandinthecorrectlocation.One
thingtonoteisthatthetwopiecesof1/8ʺsqliteplyonthe
topofthelandinggearblockthatformthechannelforthe
1/8ʺmusicwiregearareactually3mmthick,whichisa
tadlessthanthe1/8ʺthicknessofthemusicwire.Asa
resultthetoppieceF12thatcapsoffthegearholddown
willnotlayflatonthe1/8ʺsqpieces.Youneedtoglued
somepiecesofscrap1/32ʺbalsatothetopofeach1/8ʺsq
pieceandthensandthendowntothecorrectthicknessso
thepieceF12laysflat.




FokkerEIIIPage10


Copyright©2007M.K.BengtsonAllRightsReservedRev07/11
Whenready,sandalltheendsofthepieceL2andthe
maingearwirethanwillbegluedtoremovealloiletc.
Mixupsome30‐minuteepoxyandsquirtsomeintothe
endsofthebrasstubeinthelandinggearblock.Insertthe
endsofL2andthenfillthemainslotwithepoxy,addthe
gearandthenaddsomegluetothe1/8ʺsqpiecesandadd
F12.Clamptightly.



Addgluetotheslotsinthefuselageandplacethegear
block/wireassemblyinplace.Themaingearwireslants
forwardslightly.Accordingtheplantheaxlesshouldbe
roughlyinlinewiththefrontedgeofthelandinggear
block(thewidebasepiece)soImovedthegearwire
forwarduntilitwasinthecorrectpositionbyeyeball.The
wirepieceL2slantsforwardofthemaingearwireby
about1/8ʺatitspointapex.Iclampedapieceof1/8ʺthick
sprucetothemaingearwireusingclothespinsandthen
clampedthewireL2tothespruce.



Letdrythoroughlyandwhendry,removealltheclamps
andaddsometrianglestocktothegearblockinsidethe
fuselagetoreinforcethisarea.



WiththemaingearandforwardL2pieceinplace,itwas
timetogetserious.IhadtorebendtheL4piecesfromnew
wire,astheonesmybuddyRonbentupformeweretoo
short.ThisisduetothefactthatIgluedtherearlanding
gearplateinbackwardssotherearL2piecewasoffbya
bit.Nobigdeal.InfactIwouldrecommendnotbending
thetwoL4andtheoneL3piecesuntilyougetthemain
gearandforwardL2gluedinplaceandtherearL2
positioned.



IplacedtherearL2intothereartubeonthegearmount
andpositioneditaccordingtotheplans.Itleansforward
slightly;thetopapexshouldbeinlinewiththefrontof
thelandinggearplate.Withthatinplace,IthencuttheL3

FokkerEIIIPage11


Copyright©2007M.K.BengtsonAllRightsReservedRev07/11
piecetolengthandhelditinplacewithsomefinecopper
wiretokeepitfrommoving.IthenbentupthetwoL4
pieces,positionedthemandtweakedthemasrequired
andheldeverythinginplacewithsomeclothespinstoget
alltheanglesanddanglescorrect.Whensatisfied,theL4
andL3areremovedandtheL2isremovedfromthetube.
Some30‐minuteepoxyismixedupandsquirtedintothe
tubeandtheL2reinstalled.



OncetheL2isinstalledandpositioned,theL3andtwoL4
piecesarepositionedandheldinplacewithfinecopper
wire.Wheneverythingiscorrectlypositioned,thewhole
shebangisthensilversolderedtogetherusingasmall
propanetorchandsilversolder.Whendone,alltheexcess
wireisclippedandthegearisleftsotherearL2cancure.



Whentheepoxyhascured,thesolderjointsarefiledand
cleanedupasneeded.

RUDDER
Idecidedtobuilduptherudder.

Itconsistsofanumberof3/16ʺthicklasercutbalsaparts
thatyouassembleovertheplanswithadroportwoof
thinCA.Therudderisconnectedtothestabpivotbya
pieceofbrasstubingthatisattachedtothestabpivot.
Therearetwopiecesoftubingontherudderthatserveas
guidetubesfortherudderpivottube.Theplancallsfor
thesetobe5/32ʺODwitha1/8ʺodbrasstuberiding
insideofthem.Iusedpiecesof3/16ʺtube(anda5/32ʺ
pivottube),asthe3/16ʺodtubesarethesamediameteras
therudderisthick.Theplancallsforaluminumtubing
here.Iusedasmallpieceofbrassandalargerpieceof
aluminumtubingasIhadthesearound.

Thetwopiecesareseparatedbyabout3/8ʺ,thisiswhere
thepivottubethatisattachedtothestabtuberides.The
smallerdiametertubesridesthroughthetwopieceson
therudderandcapturesthetubeonthestabpivotto
provideabearingsurface.

Thisisabitdifficulttodescribebutisapparentifyou
studytheplans





FokkerEIIIPage12


Copyright©2007M.K.BengtsonAllRightsReservedRev07/11
ELEVATOR

Thehorizontalstab(fullflyingstab)isbuiltinasimilar
mannertotherudder.Itconsistsofanumberoflasercut
3/16ʺbalsapartsthatareassembledovertheplanwith
thinCAaspertherudder.

Thestabsareattachedtoalengthof3/16ʺbrasstubethat
iscarriedbythestabpivottubebearingtubes(7/32ʺOD
brasstube)thatareepoxiedandthreadwrappedtotheaft
endofthefuselage.The3/16ʺtubeandthebearingtubes
willbeaddedlaterwhenitistimetogeteverythingsetup
andalltheangles,danglesandincidencesarechecked.

Fornow,Icutthepieceof3/16ʺbrasstubetolengthand
usedittohelplocatethepartssothefitagainstthetubeis
tight.



COWL
Timetostartonthecowl.Itconsistsoftwo1/8ʺliteply
formers(oneatthefrontandoneattherearthatmounts
againstthefirewall),sixpiecesoflasercut3/16ʺbalsafor
thefrontofthecowltoallowpropershapingandthree
spacersthataremadeupfromthreepieceseachof1/4ʺsq
balsa.Thecowliscoveredwithtwopiecesoflasercut
1/32ʺply.



Ifirstcutthebalsaspacerpiecesandgluedthemup.I
thenpinnedthecowlpieceC1totheboardandinserted
thespacersloosely.Iusedthreebuildersquarestoinsure
thatthecowlpiecesC1andC2wereinalignmentandI
thenpressedthemtogetheragainstthespacers.These
wereglued;theassemblypoppedofftheboardandthe
plycowlskinsadded.Apieceofscrap1/4ʺbalsawas
gluedtothetopcenterofthecowltosupportthecowl
skinsbuttjoint.



ThenextstepistoglueupthebalsafrontcowlpiecesC3,
attachedthemtothefrontofthecowlandsandtothe
propershape.

Thecowlisheldtothefirewallbytwoboltsandblind
nuts.Lasercutholesareprovidedforthesepiecesanda
quickcheckoftheholesshowseverythinglinesupwell.



Igluedupthepiecestomakethefrontofthecowl.These
consistofsixpiecesoflasercut1/4ʺbalsathataregluedto

FokkerEIIIPage13


Copyright©2007M.K.BengtsonAllRightsReservedRev07/11
thefrontofcowlpieceC2toformthefrontofthecowl.
Whenthisisdone,thefrontedgeisroundedoverfairly
severelytogetthepropershape.Ihavenotyetstartedto
roundoverthecowlfront.

Thecowlisattachedtothefirewallusingtwo4‐40screws
andblindnuts.Theholesinthefirewallarethecorrect
diameterforthe4‐40blindnutssothereareinstalledthere
andgluedinplace.Iusedtwo4‐40x3/8ʺlongsockethead
capscrewstoholdthecowlinplace.Ifyoulookinthe
photo,youcanseeoneofthecapscrews.





AILERONS

ThefullsizeEIIIusedwingwarpingforrollcontrol.Since
thisisasemiscalemodelandriggingupafunctional
wingwarpingsystemwouldbeabitofajob,this
particularbirdwasdesignedwithfullspanstripailerons.
Whenhingedfromthetopandthehingegapcovered
theyshouldnotbetoonoticeableanditallowstheplane
toretainthescaledihedralinsteadofthe5degreesorso
perpanelthatarudder/elevatordesignwouldrequire.

TheplancallsforaHitecHS‐55ineachpaneltodrivethe
aileronineachwing.IhadacoupleofHS‐81ʹslaying
aroundlookingforanapplicationsoIdecidedtouse
them.AstheHS‐81ʹsareabitbiggerImovedtheservo
locationbackawayfromtheTEabitmoretoallowthe
servotofiteasilywithinthewingstructure.

Twolasercutservohatchesfrom1/32ʺplyareprovidedin
thekit.AsIhaveanastyhabitofbreakingthese,Imade
twonewonesfrom1/16ʺply.Ilocatedthebackendofthe
hatch5ʺfromthetrailingedgeandgluedinapieceof
1/16ʺx3/8ʺbalsaflushwiththeribbottom.Thiswillform
partofthehatchholddownandalsogivethecovering
somethingtograbonto.Ithenplacedthehatchcoverin
placeandgluedanotherpieceof1/16ʺx3/8ʺbalsaatthe
otherendflushwiththeribbottom.

Ithengluedapieceof1/16ʺx3/8ʺbalsatothebackendof
thehatchcovertoformatongue.Thiswillslipintoaslot
attheback3/8ʺbalsapiecetoretainthehatchcover.The
frontendgetsheldinplacewithsome2‐56screwsand
blindnuts.

Icutapieceof1/8ʺliteply9/16ʺwideandgluedittothe
insidefaceoftheforward3/8ʺbalsapieceallowingabout
3/8ʺorsotoextendintotheservoarea.Thisformsthe
piecethattheblindnutswillattachto.Ithenlaidthe
hatchcoverinplaceandatthetrailingedgeendIglueda
pieceof1/8ʺsqspruceontopofthebalsatongue(glueto
theribsonly).Thisformstheslotthatthetongueslips
into.Ithendrilledtwoholesabout3/16ʺinfromthe
forwardedgeandabout1/4ʺinfromthesidesthroughthe
servohatchcoverandtheunderlying1/8ʺliteplyplate.
Thesearethelocatedfortheholddownscrews.Ithen
enlargedtheholesintheliteplyplateandinstalled2‐56
blindnuts.Thehatchcovercannowhavetherearend
tongueslippedintotheslotandthehatchhelddownby
thetwo2‐56screws.

Theservoisheldinplacebytwopiecesof3/8ʺsq
basswoodeachabout5/16ʺlong.Theservolocationis
marked,thetwobaspiecesgluedinplaceandsome
trianglestockaddedtohelpreinforcethepieces.The
mountingholesarethendrilledandtheservoisscrewed
inplaceusingthe2‐56servomountingscrewsthatMicro
fastenerssells.Thesearethe2‐56SocketHeadscrewswith
theintegralwasher.Thesearegreatitemsbytheby.

FokkerEIIIPage14


Copyright©2007M.K.BengtsonAllRightsReservedRev07/11


Withbothservomounts/hatchcoversmadeupthenext
stepistomakeupandhingetheailerons.
Thedesigncallsfortheuseofstandard1/4ʺx1ʺaileron
stockandtotophingetheaileronstomasktheir
appearanceoneachwingpanel.

Idecidedtousemystandardcenterhingedaileronsand
madethemup.Iusedtwopiecesofstandardtapered
aileronstockandsevenlargeCAtypehingesperaileron
Thehingesarespacedineveryotherribbay(wellsortof)
andslotsarecutusinganXactoknifeontheaileronstock
andtrailingedgecenterlines.Whendone,thehingesare
slippedinplaceandtheaileronisassembledtothewing
panelandcheckedforalignment.Whenacceptable,thetip
endoftheaileronistrimmedandsandedtofollowthe
contourofthetip.

Ahornwillbeaddedandapushrodfromtheservotothe
hornneedstobemadeup.

Asofthispoint,asidefromsomefinalsandingand
shaping,eachpaneliscompletedandreadyforcovering
.


OneofthemostdistinctivefeaturesoftheFokkerEIto
EIVseriesofmonoplanefightersisthedistinctivecheek
fairingoneithersideofthefuselageThesewerethereto
helpfairinthecowltothefuselageduetothediameterof
therotaryengineusedontheseplanes.

Thedesigncallsforcarvingtheseoutofsomeblueorpink
foam.AsIamabitconcernedabouttheshortnoseand
longtailontheEIII(andjustabouteveryotherWWI
aircraft)Idecidedtomakemycheekfairingsoutofsome
balsablocksIhadhandy.Figuredabitmoreweightinthe
nosewouldnʹthurtthebalanceissue(althoughIwillstate
thatthedesignisverylightintheaftfuselageandtail,just
theoveralllengthversusthenoseissolong).

Icutupandgluedupsomepiecesofblocktomakeone
largeenough.Ithenplaceditonthefuselageandtraced
theoutlineofthecowlonthefrontfaceoftheblock.Ithen
brokeouttheBowieknifeandstartedhackingaway.Once
IgotrealcloseItackgluedtheblockinplaceandfinished
thecontourwithsome80‐gritsandpaperonasanding
block.

OncetheblockwasshapedtomatchthecowlcontourI
poppeditoffandtracedthesideshapeonitandcutitout
onthebandsaw.Backagainwiththeknifeand80‐grit
sandpaperuntilIhadafinishedcheekfairing.Tookabout
anhourbetweenworkandwatchingtheHistoryChannel.

Thedesignhasthewingrootcutbackatananglefromthe
leadingedgebackaboutaninchorsotolayagainstthe
cheekfairing.IfounditdifficulttogetthisanglerightsoI
justfilledinthecutbacksectionofthewingleadingedge
withasmallblockandsandedittomatchthewing
contour.Ithencutaslotinthecheekfairingoftheproper
shapetoallowthewingtoslideintoplace.Looksgood.



FokkerEIIIPage15


Copyright©2007M.K.BengtsonAllRightsReservedRev07/11
Haveonecheekfairingcompleteandamcarvingawayat
thesecond.

ThecowlontheEIIIhasaverypronouncedradiusonthe
front.Thedesignhasthree1/4ʺbalsasheetsglued
together,whichthengetcarvedandsandedtoshape.As
carvingandsandingaresomeofmyleastfavoritethings
todoIhaveputoffdoingthis.Ifinallyattackedthefront
ofthecowlwithacarvingbladeandlotsofstripsof80
gritpaper.AftercreatingamountainofdustIhaveacowl
thatlookslikeitshould.



DUMMYMOTOR
IalsostartedtoworkonthedummyOberurselRotary
Engine.Thisisanimportantpieceoftheairplaneasitis
usedtomount(andhide)theAXIoutrunnerthatwill
powertheplane.



Thedesignissimilartoothersthisdesigneruses.It
consistsofanumberoflasercutbalsaandplyringsglued
togethertoformthecrankcase.TheAXIoutrunnerboltsto
thefrontplyringsandthewholeshebanggetsboltedthe
airplanesfirewall.Thedummycylindersareconstructed
ofacoupleoflasercutbalsadiskswithsomecardstock
wrappedaroundthem.Coolingfinsaresimulatedby
heavythreadthatisgluedon.



Thefabricationoftheenginestartswithlaminatingthe
twofront1/16ʺplypiecestogether.A1/8ʺliteplypiece
thengetsgluedtotheinsidefaceofthefrontply
lamination.ThemountingholesfortheAXIoutrunner
needtobedrilledoutto3mmdiameter(about.120ʺ)so
thiswasdoneatthistime.



TheAXIoutrunneralsohasalargeCcliponthefrontface
thatholdstheshaftinplace.Thecenterholeintheply
mountingplateneedstobeenlargedtoclearthis;
otherwisethemotorwillnotlayflushagainstthemount.
InmycaseIgluedsmallpiecesofscrap1/16ʺplaceonthe
mountingfaceoftheinside1/16ʺplypieceateach
mountingscrewlocationtospacethemotorawayfrom
theplymountingplate.Ithenredrilledthemounting
screwholesthroughthesestandoffs.TheAXOoutrunner
nowmountsagainstthemountingplatewithno
interferenceproblem.

FokkerEIIIPage16


Copyright©2007M.K.BengtsonAllRightsReservedRev07/11


Thecrankcasestackconsistsoftwosections,thefrontof3
piecesof1/4ʺbalsa,therearof5piecesof1/4ʺbalsa.Iused
acoupleofpiecesof5/32ʺbrasstubeintwoofthethree
mountingboltholesasguidesinordertogetthepiecesto
lineupproperly.Whenthe5rearsectionpiecesareglued
together,a1/8ʺliteplypieceisgluedtothefacethatwill
beagainstthefirewall.Thetwosectionsarejoined
togetherusingapieceoflasercut1/8ʺbalsaasaseparator.
This1/8ʺbalsapiecehasnotchesinittoserveaslocater
pinsforthedummycylinders.The1/8ʺbalsapiecedoes
nothavetheenginemountingboltholescutinit(have
advisedthedesigner)soafterIgluedittooneofthe
sectionsIdrilledtheholesinit.Eachdummycylinderis
builtonapieceof1/8ʺdoweltoserveasanindexingpin
andtoreinforcethegluejointtothecrankcase.Moreon
thatlater.Oncethebalsasectionsaregluedtogether
(againusingthebrasstubingguidepins)thefrontply
pieceisgluedinplaceandthecrankcaseissanded
smooth.


WhenmountingtheAXIoutrunnerinthecrankcaseyou
willneedtocarveareliefpassageinthecrankcaseto
allowthemotorwirestopassfreelybacktotherearofthe
mountwithoutrubbingagainsttherotatingcan.This
needstobedone.Anoptionwouldbetoreversemount
theAXIusingtheAXImountingkit.Thiswouldalleviate
thewireroutingproblembutwouldrequiresomemodsto
thefrontplymountingplateduetothesizeoftheprop
adapterthatisusedinthiscase.

BATTERYCOMPARTMENT

Ihavespentsometimeworkingonthebottom
battery/equipmentaccesshatchandthebatterymounton
theEIII.

Thebatterymountconsistsoftwopiecesof1/4ʺsquare
balsaabout7ʺlonggluedtoeachsideofthefuselage.I
thengluedfourpiecesof3/16ʺby3/8ʺbalsafromsideto
sideasthebatterytraysupports.Thetrayconsistsofa
pieceof1/8ʺx3ʺbalsaabout7ʺlonggluedtothe
crosspieces.



Thebatterieswillbeheldinplacewithhookandloop
fastenersonthetrayandbatteryandacoupleofhookand
loopstrapsthatwraparoundthebatteryandthetray.

Nextstepistoworkonthebattery/equipmentaccess
hatch.Thehatchconsistsofapieceof1/32ʺlasercutply.
Thedesigncallsforittolayonthebottomedgesofthe
fuselagesideandthelandinggearblocks.Idecidedto
recessitflushwiththebottom.Eitherwayworksfine,
yourstochoose.


FokkerEIIIPage17


Copyright©2007M.K.BengtsonAllRightsReservedRev07/11
Ifirstgluedsome1/8ʺsquarebalsarailsalltheway
aroundthehatchopening.Thesearerecessed1/32ʺto
allowthehatchtositflushwiththebottomofthe
fuselage.AsIplantousesome1/16ʺthickx1/4ʺODrare
earthmagnets,Ineedtoaddsupportpiecesforthe
magnets.Imadethesefrom1/16ʺbalsaandaddedtwo
trianglesattherearcornersofthehatchopening.Ithen
usedapieceofsharpened1/4ʺbrasstubingtocutthe
holesforthemagnetsinthebalsapieces.



Itrimmedthehatchtofittheopeningandpositionedit
place.Ithenmarkedthelocationofthesupportrailsand
thebalsamagnetpiecesontheinsidesurfaceofthehatch.
Ithengluedsome1/16ʺbalsapiecesontheinsidehatch
faceandthenrelocateditandusedtheholesinthe
fuselagepiecestomarktheholelocationsonthehatch
balsapieces.Ithenusedthe1/4ʺbrasstubetocutthe
magnetholesinthehatchbalsapieces.



Ithenusedsomescrappiecesof1/32ʺplyandmadesome
backuppiecesforthebalsamagnetpiecesinthefuselage.
Thesearegluedonthebacksideofthebalsapiecesand
providesomeadditionalgluingsupportforthemagnets.

Ithengluedthemagnetsinplacemakingsuretheywere
properlyorientated.

Thefrontholddownissimplyapieceof1/8ʺsquare
sprucegluedtothefrontofthehatchandthenapieceof
1/32ʺplyisgluedtoformatab.Thisslipsunderthefront
pieceof1/8ʺsquarebalsathatisgluedtothefuselage.

SERVOS
ThetailsurfacesareallpullpullcablesoIdecidedtouse
threestandardsizeFutabaS‐148servos,oneforeach
elevatorandonefortherudder.Theywillbeinstalledaft
ofthebatterytrayandareaccessiblefromthecockpit.

Ifirstgluedsomepiecesof1/4ʺsqbalsatothesidesofthe
fuselagetosupporttheservomounts.Thesearespacedup
fromthebottomofthefuselageinordertoplacethe
servosinafairlylevellinewiththecontrolsurfaces.

Imadetheservomountsfromsomestripsof1/8ʺaircraft
plywoodwithsomepiecesof1/16ʺaircraftplyglued
underneathwheretheservoscrewsgotogivethescrews
abitmoremeattobiteinto.Themountswerethenplaced
onthebalsasiderails,spacedproperlyandgluedinplace
withabitoftrianglestockreinforcementatthesiderails.



Thenextstepistoaddthepullpullcableguidetubesat
therearofthefuselage.Therearetwoforeachsurface.

Theguidetubesfortherudderexitthetopofthefuselage
about2ʺbackfromtheend.Iaddedsomepiecesof1/16ʺ
balsaonthetopsideofthefuselagetosupporttheguide

FokkerEIIIPage18


Copyright©2007M.K.BengtsonAllRightsReservedRev07/11
tubes.Theguidetubesarelengthsof1/32ʺIDplastic
tubing.

Theyarecuttolengthandgluedintothebalsasupports
andthencutflushwiththebalsasupportsandsanded
smooth.ThebalsaguidetubesupportareatadflimsysoI
addedapieceofscrap1/8ʺx1/4ʺbalsaunderthebalsa
guidetubesupportpiecestostiffenthingsup.Theendsin
thefuselagearesupportedbyapieceof1/8ʺx1/4ʺbalsa
gluedacrossthefuselage.

Inordertogettheproperlocationandspacingonthe
guidetubesatthisarea,Iinstalledtherudderservoand
ranlengthsofspiderwirethruthetubestotheservoarm.
Iwasabletothengetthecorrectgeometryandspacingof
theguidetubes.Ithenlocatedtheholesonthesupport
piece,drilledtheholesusingabitheldinmyhandand
gluedthetubesinplace.

Theelevatorguidetubesaredoneinasimilarmanner.I
madeonechangeherefromtheoriginaldesign.Onthe
fullsizeEIIItheelevatorcablehornsarelocatedineach
elevatorhalfashortdistanceinfromtheinboardedge.
Thedesignhastheminstalledonthejoinertubeatthe
backendofthefuselage.Theoriginaldesigniseasier
howeverIdecidedtogowiththemorescalelocation.This
willrequiremetomakeacoupleofslightmodstothe
hornsandjoinerandsupporttubeassemblybutthereis
norealbigdifference.


Inanycase,theelevatorcablesexitthefuselageonthetop
andbottomforwardoftheruddercableexits.AsbeforeI
addedsome1/16ʺbalsaguidetubesupports,installedthe
guidetubesandaddedtheinternalfuselageguidetube
supportsasoutlinedfortherudder.Majordifferencehere
isthattherudderguidetubesupportbracewentfrom
sidetosidewhiletheelevatorguidetubesupportbraces
areverticaltopreventinterferencebetweenthesupport
piecesandthecables.

TAILSKID

Idecidedtostartmakingupthetailskid.Itismadeupof
threepiecesof1/8ʺlasercutliteplythatareglued
togetherandsandedsmooth.Thefrontedgethengetsa
pieceof1/16ʺmusicwiregluedtothefrontedgetostiffen
theskidandmakeitabitmorewearresistant.Ihavenot
addedthemusicwirereinforcementyet.



Itisimportantthatthetailskidbegluedupaccuratelyand
stronglyasitisusedtosupporttherudderhingetube
lateron.
Oncethetailskidisgluedupitisreinforcedonitsleading
edgewithapieceof1/16ʺorsomusicwiretostrengthen
theskidandtoprovideawearsurface.Thewireisbentto
followthecontouroftheleadingedgeoftheskidand
thenitisepoxiedinplace.

HATCH
Thebottomfrontsectionofthefuselagebetweenthe
forwardLGmountandthefirewalliscoveredwitha
pieceoflasercut1/32ʺaircraftply.Thedesigncallsfor
thistobeahatchbutafterlookingthingsoverIdecided
thatitwasnotnecessaryduetothelargecockpitopening
andthelargehatchonthebottomofthefuselagebetween
theforwardandrearlandinggearwires.SoIdecidedto
gluetheplyinplacepermanently.Itcouldbemadeintoa
hatcheasilyifyoudecideitisneeded.

AftergluingthebottompieceinplaceIaddedthetop
fuselagedecking.Itisalsomadefromapieceoflasercut

FokkerEIIIPage19


Copyright©2007M.K.BengtsonAllRightsReservedRev07/11
1/32ʺaircraftplyanditisgluedinplacetothefirewall
andthethreetopsidefuselageformers.Ithastwooval
slotscutinit;thesearefortheriggingwirepylonwhich
willbeinstalledlater.

TAILSKIDMOUNT

Thenextstepwastobendupthetailskidbracepieces.
Thesearemadeupofsomepiecesof1/16ʺmusicwireand
areattachedtothefuselagebygluingthemintotheshort
sectionofbrasstubingthatwereplacedintherear
fuselagelongeronsawhileback.

Thetwowirepiecesarethenattachedtothetailskidand
theskidisepoxiedsecurelytothefuselagebottomviaa
slotcutintothetailskidmount.Somecareisneededhere
asthetailskidmountalsoservesasanattachmentpoint
forthelowerendoftherudderpost.Sothingsmustbeall
aligneduptomakesuretheruddercomesoutsquare
withthefuselage.

Themainrudderpostsupportisgluedandwrappedto
thehorizontalstabilizersupporttube.Ihavenotyetmade
thesepiecesup.Ihavecoveredtheelevatorsandrudder
withsomePolyspanandwillprobablycleardopethem
andpaintthembeforeassemblingthetail.Ithinkthiswill
makefinalpaintingoftheplaceabiteasier.Iamstill
contemplatingthis.

Inanyevent,Ihavebentupthetailskidbracewiresand
locatedthemintheappropriatesectionsofbrasstube.
Somefiddlingandrebendingwasneededtogetthe
anglesanddanglesright.Thedesigncallsforthewires
andthelowerrudderpostsupporttubetobewrappedin
Kevlarthreadandgluedtothetailskid.Idecidedtowire
wrapthetwopiecesofwiretogetherwheretheymeetand
silversolderthemtogetherforabitmorestrength.Ithen
filedthenotchonthetailskidfortheruddersupporttube
abitlargersothetailskidwireswouldbeabletorestina
notchontheskid.


COVERING

Ihavecoveredthetailfeathersandtherearfuselagewith
Polyspan.Thefrontofthefuselage(whichismetalonthe
fullsizebird)willbecoveredwithChromeUltracoteand
thenIwillattempttoswirlpatternit.



