molded fiber-filledmotor mount. Using the plans
and themotormount, you must now carefullymark
the
location ofthe fourmountingholesrequiredfor
the
mount. Using adrilland a 1/8"dia. bit, drillthefour
holes throughthe firewall.Now epoxythe4-40 blind
mountingnutsin placetothebackofthefirewall,in-
to theholesjustdrilled—keepingadhesiveout of
the threads.Locate themotormount to the frontof
the firewalland use theboltstotightenit in place.
Allowthe gluetocureand removethemount. The
firewallis now epoxiedin placetothefrontof the
fuselage—aligncarefullyand allowtocure.
11.
Assemblethefueltankthatyouplantouse. This
designcanuse either10or 12oz. fueltanks.(We've
showna Du-Bro12oz. tank, mountedupright,on the
plans.) Fit yourtankintothe nose ofthefuselage
assembly.Youcansee thatthetankneeds tobe sup-
portedtositlevel.Make up a coupleofsupportsfor
thetank(twolengthsof 1/4" x 1/2" balsa, between
the
twoF-5's workswell)and gluethem in place,
making surethe tanknow restslevel.Inthisway,
whenthefuselageis complete,the tankcan bein-
sertedfromthe lowerwingopening intothenose
and removed,ifneeded, withassurancethatit is in
placecorrectly.Now use a 3/16" dia. drillbittomake
the tworequiredholesthroughthefirewallforthe
fueltubing(welikeand suggesta "twolinesystem";
one fuellineforfuelfeedand fillingand theotherfor
the pressuretapand overflow).Removethetank.
12.
Drilland taptheholesnecessaryin themotormount
to attachyourengine(weliketouse4-40 Allen-head
hardwareforthispurpose). Attachthemotormount
to thefirewalland the engineto themount.By view-
ing fromthe front,determinethelocationof the
throttletubehousingexithole. Thisshouldbe lined-
up withthecarb'sthrottlearm. Drilla 1/16"dia. hole
throughthefirewallforthistube.Rough-uptheouter
surfaceof theouterthrottletubehousingand glueit
in place in thefirewall—about3/16"ofit shouldpro-
trude out fromthefaceofthefirewall,therestof it
runs intotheradio
compartment. Be
sure your
tank
stillfitsin place.
13.The servos shown on the plans are of average or
standard configuration;yoursmay be different
(taller,wider,etc.). The ElderBiplanewillaccept
almostany radio system.Inthisstepyouare going
to determinethe locationofthe 1/4"x 1/2" balsa
servotraybearers. Remember thattheservotrayis
1/8"thickply. Lay one of theservosthatyouplan to
use directlyover theside of thefuselage,at the loca-
tion shown on the plans and mark thelocationof
thesetraybearers. Cut, fitand gluein place the servo
traybearers,one on each side of the fuselage.
14.Using the 1/8"x 3" x 30" balsa sheet provided,the
bottomnose of thefuselage,back to the rear faceof
F-7 is sheeted—notecrossgraindirection,typical
throughout thisstep. Again,hold or tape the lower
wing'scentersectionin placein the F-5 wingsaddle.
The bottom rear of the fuselageis now sheeted from
the
trailingedge of thecentersection,back tothe
point shownon the plans. The topof the fuselageis
now sheeted,as shownon theplansand illustra-
tions.Asshown,do not sheetthetopofthe1/4"ply
firewall,thisisthelocationofthetopF-3 former.Use
yoursandingblocktosmooththefuselagesides
and sheetingjustappliedand toblendthebottom
nose sheetingand landinggearmountingblocks to
the smoothcurveshownon theplans.
15.Using a penciland triangle,hold thefuselagedirect-
ly overthesideviewon theplansand mark theloca-
tionofformersF-6,F-8,F-9, F-11 andF-12directlyon-
tothetop1/8"balsa sheeting.From yourkitbox,
locatethetwo1/8"x 6" x 21" balsasheetsthatare
the fuselagesides.Use a straightedge and an
X-actoknifetotrue-upone ofthelong edgesofeach
of thesesheets.Now lay one of thesheetsdirectly
overthefuselage,aligningitstrued-upedge withthe
top surfaceof the top1/8"sheeting.Note thatthefor-
wardend ofthesheetingterminatesat sectionB-B.
Withthesidesheetingproperlyaligned,pressit to
thefuselagesideat thetubeends ofeachof the
cabane trunnionblock locations.Thisshouldindent
thesheetingwiththe slightlyprotrudingtubing
ends. Removethesheetingand use a 1/8"dia. drillbit
tomake a hole throughthe sheetingat both indenta-
tions.Repositionthesheetingtothe fuselageand
use a pencilto carefullydrawthe bottomand rear
fuselageside outlinesonto the sheeting.Use your
X-actoknifetoremove thedrawnoutline. This
fuselagesideis now gluedin placetothe fuselage
frame.Repeat processfortheoppositeside. Use
your sanding block to true-upalledges and sides.
16.
Locate and remove 1/4" die-cutpartsF-3 (1)and F-4
(2). Standthe fuselageon itsnose, firewallflatto
yourworksurface.GluethetwoF-4 formersin place
to each sideof thefirewalland theF-3 formertothe
top ofthefirewalland thetopsofthetwoF-4's. Use
your sanding blocktosmooththeformerstotheface
of the firewall.Locateand removeformersF-6, F-8,
F-9,F-11 and F-12 fromtheirdie-cutsheets.Using
the locationmarks made earlier,glueeach of these
semi-formersin placetothetop ofthefuselage.
Make sure theyare centeredand thattheysitat right
angles tothe fuselagesheeting.(Notethattherewill
be oneextraF-6 former—itwillnot be needed.) From
the stockwoodin your kitbox, locatea lengthof 1/4"
sq. balsa. Measure, cutand fitthe requiredlengthto
fitintoF-12 (at the rear), forwardto and includingthe
F-2location—4-1/2"ahead of sectionA-A.Partially
cut throughand crackthislongeron at theF-9and
F-6formerlocationsto obtain the right outline.Glue
this longeron in place. Cut and fitthetworequired
1/4"sq. balsastiffenersthat fitintothe F-4 formers
and angleback tothesecond1/4"x 1/2"upright(sec-
tionB-B). Note thatthesetwopieces fitonlyintoone
half of thewidthof F-4 and that theyare notched to
fitinside oftheupright(see Top View).
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