Bengtson Company HALBERSTADT DIII User manual

HalberstadtDIII36’
Copyright©2005‐11M.K.BengtsonAllRightsReservedRev07/11
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HALBERSTADTDIII36”
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R/CScaleModelInstructions
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CONTACTINFORMATION
DesignedbyM.K.Bengtson
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ManufacturedandDistributedby:
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BengtsonCompany
e‐mail:[email protected]
WebSite:www.aerodromerc.com

HalberstadtDIII36’Page1
Copyright©2005‐11M.K.BengtsonAllRightsReservedRev07/11
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HALBERSTADTDIII36”
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ThankyouforpurchasingtheHalberstadtDIImodel
plansforelectricflight.
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FinishedModelBYDaveOttney
Thefirstsingle‐seatscoutproductoftheHalberstadter
Flugzeug‐Werkewasthe100h.p.Mercedes‐enginedD.I
oflate1915.Thiswasanorthodoxslab‐sided,two‐bay
aircrafttypicalofitsperiod,withaflush‐typeradiator
locatedinthestarboardsideofthecenter‐sectionpanel
andaclawbrakemountedinthecenteroftheaxle.The
D.Iwassubsequentlymodifiedbyinstallinga120h.p.
ArgusAs.IIenginewhichwascompletelycowledin
behindacar‐typeradiator,withanungainlyexhaust
manifoldejectingoverthetopwing.In1916the
aircraftwasagainre‐enginedwiththe120h.p.Mercedes
D.II,andinthisformitwentintoproductionastheDII
tosupplementtheFokkerDtypebiplanes,whichwere
thenreplacingtheobsolescentFokkermonoplanes.The
HalberstadtD.IIwasaneatlittleaeroplaneanditstwo
baywingstructuremadeitexceedinglystrong.
RelativelyfewD.IIsandD.IIIswerebuilt,thoughsome
wereconstructedunderlicensebyHannoversche
Waggonfabrik.ThereportoftheInter‐Allied
CommissionaftertheArmisticerecordedthat100
HalberstadtD.IIandD.IIIswereattheFrontinJanuary
1917.Theyweresuppliedinitiallytothe
KampfeinsitzerkommandosservingwiththeFl.AN.
reconnaissanceunitsforprotectionduties.However,
withtheformationofthefirstJastasinthelatesummer
of1916theyjoinedtheFokkerDIllsandDIVs,and
someofthefirstAlbatrosDIs,toformamotley,
compositeequipagefortheseunits.Bytheendof1916
theHalberstadtD.IIandD.IIIhadbecomeobsolescent
andwerelargelywithdrawnfromtheWesternFrontor
relegatedtoquietersectors.However,whileon
operationstheywereabletogiveagoodaccountof
themselvesandwerecertainlyrespectedbytheirAllied
adversaries.
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THEMODEL
AsemiscaleadaptationoftheHalberstadtDIII,this
modelisdesignedtobeeasytobuildandexcitingtofly.
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POWERSETUP
ThemodelcanbesetuptobepoweredbytheGWS
300CmotorandtheDgearboxanda10x4.7APCprop.
Batterypowerpackcanbe7600maHNicadsoran
equivalentweightNimh
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R/CGEAR
Afourfunctionminireceiverandfourmicroservosare
allthatarerequired.
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SPECIFICATIONS
Morethan160lasercutparts
Scale:  ~1/9
Channels: R/E/A/T
Wingspan: 36ʺ
WingArea: 401sqin
Weight: 23ozreadytofly
PowerSystem:GWS300CwithDgearbox
Prop:  10x7
Wheels: BalsaandplywoodwithNeoprenetires
AirfoilType:Flatbottomed
Cowl:  N/A
Spinner: N/A
Covering: BalsaandLitespanorPolyspan
Decals: Availableonthewebsite
PrototypeBy: DaveOttney
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
WingConstruction
Pindown,overtheplan,thet/e,sparsandwingtip,
gluingasrequired.Addtheleadingedgestockafterthe
basicframeisdoneasthestockisinsertedinarotated
fashion.Addthewingtipsandalignthefronttip
alongthecenteroftheleadingedge.Sandtheleading
edgestocktoberoundedandmeettheribs.
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TheUpperwing
Upper Wing Construction Detail
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.
BuildingoftheRightSideoftheFuselage
Beginbybuildingtworearfuselageframesoverthe
planandallowtodry.Selecthardbalsaorbasswoodfor
thelongerons.Buildoneframeandletitdry,thenturn
thisoverandbuildtheotherframeontopofit.Now
theyshouldbothbeidentical.Usesomethin
polyethylenesheetbetweentheassembliestoprevent
themstickingeithertotheplanortoeachother.
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Jointhetwoframesovertheplanwithcrossbracesand
thetailskidmount.Check,checkandcheckagainthat
thisandAllotherstructuresremainperfectlystraight
andsquare.
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FuselageConstructionDetail
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Strengthenthetriangularsectionsoftheformerswith
thinCA.
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FuselageConstructionDetail
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Optional1/32”balsasheetingshownoverstringers.
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FuselageConstructionDetail
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Here2lamsof1/32”balsaareusedtomakethecockpit
decking.CAthemtogetherforstrength.
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CockpitDeckingDetail

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AddingtheUndercarriagePlates
UndercarriageConstructionDetail
Removefromtheboardandaddtheplywoodformers
crosspiecesthatserveasu/cplates.
AddingtheDecking
Addallthestringersandformers,andcarefullytrimto
sizeandfit1/32”sheeting(sheetingisoptional).
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DeckingConstructionDetail
TAILSURFACES
Layoutandgluepartsofthetailsurfacesontheplans.
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TailSurfaceConstructionDetail
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TailSurfaceConstructionDetail
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Jointheelevatorswiththe1/8”doweljoinerthatis
insertedintothecarbontubebearing.Sandthetail
parts,roundingoffalledges.Don’taddthehornsor
hingethesurfacesuntilaftercoveringiscomplete.
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LANDINGGEAR
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LandingGearConstructionDetail
Assembleplylandinggearpartsandusethemas
templatesforbendingmusicwirereinforcements.CA
strengthentheplyportionsforstrength.Securethe
structurewithkevlarthread.Attachlandinggearto
fuselagewithkevlarthread.
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DUMMYMOTOR
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DummyMotorDetail
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MOTOR
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MotorMountDetail
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MotorMountDetail
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COVERING
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AssembledWingsandFuselageReadyToFit
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AssembledComponentsTestFit
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Testfitcomponentsforproperfitbeforecovering
Anylightweightcoveringmaterialcanbeused.
PolyspanmakesagoodchoiceLitespanisalsopopular.
ThisprototypewascoveredinCoverlite
Downloadabledecaloutlinesareavailableon‐lineat
http://www.aerodromerc.com/decals.htm
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PaintingInProgress
WHEELS
Gluingtheplysidesonthe¼“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

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hubsareprovidedthataretoslipoverthebrasstubing
asshown.Alternatively,gluinganadditional½”
squarepieceofscrap1/8”balsawithaholedrilledinthe
centercanbesubstituted.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.
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WheelConstructionDetail
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INSTALLINGTHERADIOCONTROLGEAR
ServoBay
ItisaswelltogetthebulkofyourR/Cgearfittedatthis
stage,andalsothemotor.
BatteryTray
Afteralltheabovehasbeenplaced,mountthebattery
trayandusethebatterypositiontobalancethemodelas
shownontheplan.
ASSEMBLY
WING
UsingLocatingDowelsandAligningWingPanels
Thefirsttaskistoepoxythelowerwingsaccurately
ontothefuselage.Use5‐minuteepoxyforthistask.
Applyepoxytothewingribthatmeetsthefuselage.
Attachthewingstothefuselage.Usethelocating
dowelstoassistwithaligningthewingpanels.Allow
epoxytoset.
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Afterthelowerwingsareattached,thestrutsare
inserted.Thetopwingisaddedandepoxiedinplace.
Thetriangularformersaidingettingthewingincidence
accuratelyplaced.
FittingTailSurfaces
Slipthecontrolhornsontothewirepushrodendsand,
withboththeservosandthecontrolsurfacescentered,
gluethehornsintotheirslots.
FittingtheRiggingPostsandGuy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tothemountingcrosspieces
placedinthewingduringassembly.Whilenot
technicallyrequiredthesewirescanaddadegreeof
strengthtoyourmodel

ConstructionDetail


HalberstadtDIII36’Page6
Copyright©2005‐11M.K.BengtsonAllRightsReservedRev07/11

TailSkidConstructionDetail
BALANCINGTHEMODEL
Balancethemodelatthepointshown.Itisbestto
positionthebatterytodothisoperation.

FLYING
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.aerodromerc.com