Bengtson Company Wedell Williams 52.4 User manual

WedellWilliams52.4”
Copyright©2005KurtBengtsonAllRightsReservedRev10/05
WedellWilliamsRacer
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R/CScaleModelInstructions
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CONTACTINFORMATION
DesignedbyKurtBengtson
PrototypebyGregSmith
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ManufacturedandDistributedby:
BengtsonCompany
POBox51102
PacificGroveCA93950
PhoneandFax:831‐393‐0991
e‐mail:[email protected]
WebSite:www.aerodromerc.com
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WedellWilliams52.4”Page2
Copyright©2005KurtBengtsonAllRightsReservedRev10/05
WEDELLWILLIAMS
ThankyouforpurchasingtheWedellWilliamsmodelfor
electricflight.
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THEMODEL
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Asemi1/6thscaleadaptationoftheWedellWilliams,this
modelisdesignedtobeeasytobuildandexcitingtofly.
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FinishedModelbyGregSmith
POWERSETUP
TheAXI2820/12DirectDrivemotoranda12/8APCprop
powerthemodel.Batterypowerpackisa3100mah3s2p
lithiumpack.
SPECIFICATIONS
Morethan205lasercutparts
Scale:1/6
Channels:R/E/A/T
Wingspan:52.4
WingArea:441sqin
Weight:52oz
PowerSystem:AXI2820/12DirectDrive
Prop:12x8APC
Wheels:balsaplywoodwithNeoprenefoamtires
AirfoilType:flatbottomed
Cowl:builtupbalsaandplywood
Covering:BalsaandLitespan,PolyspanorCoverite
Microlite.
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FEATURES
 Removablewingconstruction
 Wingalignmentisbuiltintomodel
 Scaledihedralwithailerons
 Scaleribplacementandairfoil
 Lightweightfrontbalsasheetedformer,stringerand
keelfuselageconstruction
 Lasercutpartsforbuiltupcowlincluded
 Lasercuttailpartsincluded
 Lasercutbalsaforbuiltupwheelpants
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KitincludesVacuumFormedEngine–FrontOnly
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KitIncludesVacuumFormedCanopy
ReplacementEngineFrontsandCanopies
Availableat:www.AerodromeRC.com
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
Thewingisbuiltinthreepieces,twoouterpanelsanda
centersection.Buildthesectionsandjointhemlater.
Startbybuildingthecentersection.Thesparsare1/4ʺ
balsa.Forthecentersection,everythingpinstotheboard.
Addtheplywoodlandinggearmounts.Inserttheblind
nutsandglueinplace.Addtheleadingedgestockafter
thebasicframeisdoneasthestockisinsertedinarotated
fashion.
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WingCenterSection
Fortheouterpanels,thecentermostribisangledtoallow
fordihedral,andthekitincludesatemplatetosetthe
dihedralangle.
Oncetheleadingedgeison,shimuptheentirewing

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paneloffthebuildingboardwithscrap1/8ʺbalsaandre‐
pinthepanel(thatnowhasaleadingedge)totheboard.
Thisshimmingisnecessarysotheleadingedgeclearsthe
board,allowingthewholewingpaneltobepinneddown
again.
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WingConstructionDetail
Addthetipribandthewingtipsupportpart.Notethat
theseareangledupwardslightly.Abalsaangletemplate
isincludedwiththekitsoyoucangettheangleright.The
bottomsparwillneedtobecrackedandbentupwardto
accommodatetheupwardangleofthetiprib.Thisisthe
onlypartofthewingassemblywhereyouneedtobea
littlecareful.Thewingtipsarebuiltwiththewingpinned
totheboard.Withthewingpanelpinnedtotheboard,
gluethecurvedwingtippiecetotheendrib,leadingedge
andtrailingedge,beingcarefultogiveitthecorrectangle
asshownonthebalsatemplateincludedwiththekit.
Crackthetopandbottomsparssotheycometogetherat
thewingtipandglueinthespars.Addtheplywood
riggingpointmounts.Theyaremadefromplywoodfor
thecasethatoptional1/16thmusicwireriggingisused.
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WingPanelsJoined
Thethreewingpartsmustnowbejoined.Pinthecenter
sectioninplaceontheplan,lineupeverything,andshim
upthewingtipsasshownontheplantogettheproper
dihedral.Epoxytheribswheretheribsmeetandallowto
set.
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Sheetthecentersectionforstrengthandtomakesurethe
epoxiedjointsholdfirm.The1/16balsaeasilybendsto
theslightcurveofthedihedral.Gregsheetedthetopand
bottomwith1/16balsa.Onthebottom,heonlysheeted
thejointswiththecentersection.
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WingSheeting
TheLeadingEdgeoftheAileron
Theleadingedgeoftheaileronisroundedoverwith
sandpapertomaketheaileronmovablewithaminimum
gap.Thetrailingedgeofthewinginthatsectionisleft
flat.Alternately,tophingeusingcoveringashinging
material.InthismethodbeveltheLEoftheaileronfrom
toptobottom.
FUSELAGECONSTRUCTION
Thefuselageisofformerandkeelconstructionwithan
internalplyriserthatservestofixthecabaneattachment
points,undercarriageattachmentpoints,motormount,
lowerwingandbatteryintoaunifiedstructure.
Beginbyassemblingthetopandbottomkeelsontheplan.
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FuselageLeftSideConstruction
BuildingoftheLeftSideoftheFuselage
Buildtheleftfuselagesideframeovertheplanincluding
thesidekeel.AddthefrontformerF2andthelastformer
F7thenthesidekeel.Usingthesidekeel,theother

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formersareaddedmakingtheverticalalignmenteasy.
Adddiagonalbracesbeforeremovingtheassemblyfrom
theboard.
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FuselageBracing
Finishingtheleftsideandstringers
Attachstringeralternatelyleftandrightinasymmetrical
fashiontoavoidabananafuselage.
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FuselageRightSideFormersinPlace
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FuselageSheetedandStringered
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1/16thbalsasheetingisshown.Choosethelightestbalsa.
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ThemotormountisdesignedforanAXI2820/12.Itiseasy
toassemble,withdownandrightthrustincorporatedinto
theparts.
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FuselageMotorMount
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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.
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VerticalTailSurfaceConstruction
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HorizontalTailSurfaceConstructionl
LANDINGGEAR
Thelandinggearismadefrom1/8”musicwire.

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AddingtheUndercarriagemounts
Theundercarriageismountedusing1/8”landinggear
straps.
WingFairings
Gregfashionedwoodenwingfairings.Hesays:”The
baseforthefilletsis1/32ply.Tomakeitbendaroundthe
forwardedgeofthewing,cutkerfs.Donʹtworryifyou
cutthroughthethinply,youcanjusttapethelittlekerf
piecesonthengluethemtotheframe.“
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WingFairing1/32”PlyScoring
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WingFairingAttachment
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WingFairingSoftBalsaFill
“Ineededtoaddsomewoodtothefusetohave
somethingtogluethefilletbaseto.Theredarrowsshow
whereIaddedbalsawoodtothefuse.
Usewoodgluetogluethefilletbaseson.Itsetsupslowly
soyoucanadjustthingswhileitsets.Boltthewingonto
holdtheplyfilletbasesinplaceastheydry.
Withthefilletbaseson,cutchunksofbalsatodefinethe
outlineofthefillets.Puttywillbeusedlatertofillholes
soyoudonʹtneedtobetooneatasyoublockthebalsain.“
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WingFairinginPlace
COWL
Thecowlismadefrom1/8”,1/32”plywoodand1/4”
balsa.Italsoservesasthebatterymountinglocation.His
planshowsaconventionalNIMHbatterypackagainstthe
firewall.GregfashionedabatterytrayforaLithium
batterythatfitsinthebottomofthecowlitself.Fourbolts
holdonthecowl.

CowlConstructionDetail
BatteryTray
Thebatterytrayinthecowlis1/16ʺply.Thebatterysitsin
bottomdeadcenterinthecowl.
