Bengtson 1/16th Scale Manuale utente

SopwithTriplane20”

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SopwithTriplane20”1/16Scale

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R/CScaleModelInstructions

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CONTACTINFORMATION

DesignedbyM.K.Bengtson

PrototypebyDaveMitchell

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ManufacturedandDistributedby:



BengtsonCompany

e‐mail:[email protected]

www.aerodromerc.com

SopwithTriplane20”Page1

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Sopwith Triplane 1/16th Scale

Thankyouforpurchasingthe1/16thScaleSopwith

Triplanemodelforelectricflight.

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THEMODEL

Asemiscaleadaptationofthe1/16thScaleSopwith

Triplane,thismodelisdesignedtobeeasytobuildand

excitingtofly.

Specifications

More than 200 laser cut parts

Scale:  1/16th

Weight: ~6oz

PowerSystem:GWSIPSA

Prop:  7x3

Channels: R/E/T

Wheels: BalsawithNeoprenefoamtires

Wingspan:~20ʺ 

AirfoilType: Flatbottomed

WingArea: 137sqin

Cowl:  Builtupbalsa

Decals: Availableonthewebsite

Designer: M.K.Bengtson

PrototypeBuilder: DaveMitchell

Thefollowingbuildinformationisfrompostedcomments

byprototypebuilderDaveMitchell

DaveMitchellhere,erstwhilesecretaryfortheD/C

Maxecuters.Irecentlystartedaprototypebuildofan

AerodromeR/CSopwithTriplane,19.8ʺWS,micror/c.

SuppliedtomebyAirMidiMicros.Aneatlittlebeastie‐‐

photosaswegoalong.



TheplancallsforanIPSA,butthepropdiameteris

limitedto7ʺ,soIsuggestedanIPS2instead‐‐‐lookclose,

andyouwillseethenotationontheplan!Iʹllbeusingall

stockmicroGWSgearasperAirMidiʹsrequest,asthisis

whattheysell‐‐‐‐‐sonobreak‐the‐bank‐in‐the‐pursuit‐of‐

superlightweight‐happinesshere.R‐E‐T.Iʹmhopingto

bringitinat1g/sq.in,whichwouldpegitat137g,so

yeah‐‐‐around5oz.Thatmightbeoptimistic,butweʹll

see.Usingallkitwood,andforthemostpartfollowing

plansexceptforafewminormods.Itwilldefinitelybean

outdoorflyer.

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SopwithTriplane20”Page2

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Itriedsomethingnew(forme)forhingingthe

tailfeathers,illustratedhere.Thefinandrudderpostsare

laminated,withafewstripsofKevlarthreadbetweenthe

laminationstoserveashinges.Workswell‐‐besuretopre‐

beveltheedgesofthepoststoallowmovement.



StartingtolookSopwithishatthisstage.Timetostart

inonallthosewings....

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Heresheiswiththebottomwingpinnedinplace....

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WHEELS

Gluingthe1/16”balsasidesonthelaminated1/16”

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1/4”Diameter

neoprenecordingtogethertofroma“tire”.UsethinCA

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

SopwithTriplane20”Page3

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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.



Hereʹsashotofoneofthelowerwingpanelonthe

board.Imadesomemodificationstotheriblayout.Kit

uses1/32plytrailingedge‐‐interesting

‐

Iʹmshootingfor1g/sq.in.Youʹllhavetodothemathto

translatethatintooz/sq.ft,Iʹmtoolazy!

IhaveseveralR/Caircraftflyinginthisrange,allusing

prettymuchthesameGWSgearasIwillhaveinthe

Sopwith,thoughallofthem(a28ʺHerrStearman,a

24ʺHerrPittsSpecial,anda20ʺscratchbuiltFokkerDr1)

usetheIPS‐Amotorwith9‐10ʺprops.

Finishedoffallthemwingsandstuckittogetherfora

photo.



Andacloseup.Notetheplytrailingedgeofthewings.

Theinterplanestrutsaredesignedtoregisterthewing

spacingcorrectly.Notethereisasteponallfourstruts

thatthemiddlewingisrestingon‐‐kindofhardtosee

here,Iʹlltrytopostaphotothatshowsitbetter.Oncethe

middlewingisgluedintoplace,asecondpieceisgluedto

thetrailingedgeofeachstrut,abovethemiddlewing,to

finishoutthestrutprofile.

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Wirelandinggearinplacenow,andeverything

sandedup.IhavedecidedtocoverherwithLitespan,

whichisamaterialIhavemixedfeelingsabout,butI

thinkitwillbegoodforthisbird.Itistougherthantissue,

whichisafeatureImayneedgiventheplaneʹsrelatively

highexpectedwingloading.SoIspenttheevening

SopwithTriplane20”Page4



brushingtheframeworkwithBalsalocandgettingallthe

littlebitsinplace.



Anotherview.Thebatterywillbelocatedinbottomof

thenose,betweentheLG.Ihadoriginallythoughttousea

350mah2SLipoly,butIamthinkingnowalittlesmaller,

tosaveabitofweight.Wewillseehowitbalances....



ProgresscontinuesontheSopwith....nearlydone.I

havechosentofinishherinFrenchmarkings,aircraft#10

locatedinDunkirk,1917.Photoevidencesuggeststhat

thisaircraftactuallyfeaturedthelargetailplaneofearly

Tripes,butWTH.

IcovereditwithLitespan,asplanned,butIwoundup

makingtissue‐and‐Litespaninsigniasandmarkings,

appliedwithFuturefloorpolish,workedprettywell.The

noseiscoveredwithaluminiumleaf.



Landinggearandwheelson.....andapaperClergetin

thenose.Ipluggedherintoday,ranthemotorupand

checkedallthecontrolsurfaces.Afewmoredetailsand

someriggingandsheʹsreadytogo!



Anotherview.WhatagreatdesigntheSopwith

Triplanewas!



Anothershot,inthemorningsun.Ijustneeda

machinegunandatailskidnow,andtoworkupahatch

forthebattery

SopwithTriplane20”Page5



HereisanexcerptfromDaveʹsMaidenflightreport:

“IgottoflytheSopwithTriplanetoday.Lightbut

slightlygustywinds.Firstflightswereunpleasantlyhairy‐

‐twitchyandovercontrolled.Idialedbacktheservo

throwsandfedinabitofexponentialforthestab,and

thingsgotbetter,butitwasstillnotideal.ThenIputina

larger(350mah)batterypack,whichmovedtheCGupa

bit‐‐‐ahhh,nowweʹregettingsomewhere.IthinkIwill

needtodropinanother5gorsoofweightinthenose.I

hadinstalledaGWSIPS‐2motor,withaGWS7060prop.

YoucouldprobablyfallbacktoanIPS‐Amotor,withthe

sameprop‐‐‐IhadwaymorepowerthanIneeded.Very

sensitivetocontrolinput,especiallystab.Sheʹsnotfora

beginningflyer,andsheʹstoohotforindoorsunlessitʹsa

bigsportsdome,butshesurelooksneatintheair....Iʹma

happycamper“



CONTACTINFORMATION

Distributedby:

BengtsonCompany

e‐mail:[email protected]

WebSite:www.aerodromerc.com



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