
thesurface
with
glue,
then
glue
thehornintoitsslot,using
plen-
ty ofepoxy.
The
position
ofthe
horn
-
andin
particular
the
position
ofthe
lin-
kageholerelativetothehingeline
-must
be
identical
onbothai-
lerons,otherwisetheywillnothaveequalmovement.The
60
de-
gree
bellcranks
provide
differentialaileron
movement;
ifyou
movethe
pushrod
anequalamount
either
wayfrom
the
wing
root,theaileronshoulddeflect
more
upthandown.
Gluethebellcrankassemblyintothewing,
using5-minuteepo-
xy,checkingthatthemountissufficientlydeepinthewing,and
thatno
gluegets
ontothebellcrankto
jam
itup.
Temporarilyhingetheaileron
tothe
wingwith
stripsoftapeand
pin
itatneutral.Setthebellcranktoneutralalso.Markthe
point
at whichthe pushrod
crossesthe horn,andbendthe rod at
right
-
anglesatthat
point.
Cuttheangledenddowntoalength
of10mm
andconnectittothehorn.The
entire
aileronlinkage
cannowbe
checked
lor correctoperation.Thethreaded
push-
rodmustbefreetomoveinsideitstunnel.The
aileronsshould
be
abletodeflectabout
40degreesupand20degreesdown,
andmustnot
jamup or rubat anypoint.
Adjustthe linkage
wherenecessaryuntilthisislhecase.
Sealthebellcrankwellwith
rhe
well
cover21(grain
direction
spanwise).
Be
sureto
glue
itsoundi:...Sand
thecoverback
flush
withthewing
skin
when
the
glue
hasJ3thard.
Installingthe aileron sen os in the wings
We
canonly
providegeneral
guidelines
here,
asservos
vary
so
greatly
in
sizeand
mounting
provisions.
Youmustdecideatthe
outsetwhetherthehatch
overtheservowellisto beremovable
or glued
in place.
A removablehatch
severelyweakensthe
wing,and
you
mustremedy
thisby
installing
reinforcingwebsin
aspanwisedirection.Werecommend
spruceor
plywood
strips
ofappropriatesize.
However,in practice a permanently
sealed servo well has
proved
anexcellentalternative.
Servo
failure
isextremelyrare,
andifthisshouldhappenthehatch
caneasilybecutoutandre-
placed
with
anew
one.This
method
ismuchsimpleranddoes
notweakenthewing
significantly.
Installingtheservoextensionleadisvery
simple,asthebowden
cableouterisfree
tomoveinside
thewing.Pulltheouteroutof
theservowellslightly,
cutofftheendoftheextensionleadatan
angleand
glue
itintothe
outer
with
adropofinstant
glue.
Now
pull
thebowdencableouteroutof
the
winglrom
therootend
andtheleadwill
bepulled
throughthewingwithit.
Westronglyadvisetheuseof
separation
filtersityouintendins-
tallingservosinthe
wings.
Thefiltershould
be
littedat
the
wing
root
endof
thelead,
asclosetothereceiveras
possible.
The
MULTIPLEXextensionleadset including
separationfilteris
availableunderOrder
No.
85138.
Thelinkagebetweenaileron
servoandaileroniscompleted
with
anM2threaded
pushrod
withaclevisfitted
atthe
horn
end,to
provide
a
means
ofadjustment.Checkthattheservooutputarm
can
movefreely
tobothendsolitstravel.In
general
terms
you
shoulduseaslongaservo
output
arm
and
horn
as
practical,
as
thishelpsto minimise
"spring"
andslopinthelinkage.
Wingtips and plug -in tip extensions
Sealoneendofthebrasstubes
53and54,either
with
glue
orby
squeezing.Insertthebrasstubes
(4
mm
diameter
front,
3
mm
diameterrear)betweenthereinforcementsinthewings
and
the
plug
-in
extensions.Usearoundfileto
pilot
-
drilltheholesifne-
cessary.Fitthesteeldowels22and23,and
temporarily
join
the
extensionstothe
win9s.
Checkforalignmentandmakeanyad-
justments
required.Epoxy
thetubesin
place,
join
thewingsand
extensions,andleavethem
caretullyalignedwhiletheepoxy
cures.Thebrasstubesshould
projectbyabout3
mm.Drillholes
wheremarked
inthetipribs45,andcheckthattheyfit
accurate-
ly.
Glueonetip
rib
tothe
wing
panel
tip,securewithtapeandal-
lowthe
glue
toharden.Sandbackthe
brasstubes
flushwith
the
rib,
then
tix
thesecondtipribtothefirstwithsmall
pieces
of
double
-sidedSellotape.
Applyepoxyto the rootface of the
plug
-in
extensionand
press
itagainstthewing.Tapeitin
place
securely,takingcarethatno
gluegets
inside
thebrasstubes.
When
theepoxy
has
sethard,useaflatsandingblocktosand
backthetipribsflushwiththewing
skins,
with
the
plug
-inex-
tensionsin
place.
Bendthe
ioiner
dowelstoa
gentle
"S"
shape,
toensurethatthetipextensionsareheldsecurely.
Cut
thetipblocks46tolength
and
glue
themtothe
plug
-
inex-
18
tensions.Sandthemto shape
when
theglue
has
set.Cut
to
length
thetipblocks
tor
the
wings
proper,
and
mark
onthemthe
position
ol the brasstubesin the wingtip.
Drill
holesabout
'10
mm
deepattheappropriateangle
(tront
3
mm,
rear2
mm).
Roughenuponeendofthelocating
pegs
24
and25andbend
themtoa
gentle
"S"
shape,sothattheyarean
interferencefit
in
thebrass
tubes;
plug
themintothebrasstubesinthewing.Fit
thetipsand
check
that
they
fit
snugly.Maskoffthetiprib
with
tape(to
prevent
itgetting
stucktothewing)and
pierce
itwhere
the
pegspass
through.Applyepoxytotheholesinthetipblock
and
plug
it
ontothe
pegs.
Press
theblockagainstthewingtip,
secure
with
tape,andallowtheresilrtocure;Carefully
prise
oll
thetipblock,slidingathinknife
bladebetweentipblockand
wingtip.Removethe tape,
plugin the tip blockand sand
smooth.
Airbrakes
TheAlpina
magic
istactory
-fittedwith
twin
-bladesuper
-air-
brakesasstandard;all
you
need
todois
completethelinkage
and
fit
theblades.
Bend
the
final
2
mm
ofthesteel
pushrod
49
atright
-
angles,fita
metal
clevisandsolderthe
joint
well.
Rotatetheairbrakeleverstothe
upright
position,pulling
theac-
tuating
mechanism
towardsthewingroottoraisetheendlever.
Threadthe
pushrod
intothe
outer,
positioning
the
rod
underthe
front-facing
pins
onthelevers.Thisis
essential
if
thebrakeunit
is
to
function
correctly.
When
theairbrakeisclosed,these
pins
holdthe
pushrod
inposition.
Thread
the
rodinto
thebov n
cableandconnecttheclevistothelugontheactuating'.,€-
chanism.Checkthatthebrakefunctionscorrectly.
The
brakebladescannowbefittedusingthescrews50:firstthe
lowerblade52thenthe
upperblade
51.Please
take
particular
careatthisstage;itisessentialthattheshallowflangeonthe
screw
head
engages
inthebrakeblade,otherwisethebrake
unitwilltendto
jam.
Thescrewheadisnecessarilyverythin,so
besureto usea screwdriver
witha perlectly
squarebladetip,
and work carefully.
Takecare also notto bendor distortthe
blades.Theycan easilybe straightenedif necessary.
Check
thatthebrakesystemworkscorrectly.
Cutthebrakecap55tolength,trimtofit,and
glue
itin
place
with
contactadhesive.Donot
uses-minuteepoxy
for
this
joint,
as
you
risk
gluing
theairbrakemechanismtothewing,whichinva-
riablyresultsin seriousdamageto the structure.
Sand
the
brake
capto section,using
no morethanmoderate
pressure.
Theuseofthescrews53as
pivots
allowstheusertoremovethe
brakebladesandreplacethema
tew
times,
which
canbe
very
usefulatthefinishing
stage.
Nevertheless,alwaystake
great
care,andneverusetorce.
Wingjoiner blades
Thenext
step
isto
glue
the
wing
joiner
blades20andthelc '-
ing
pegs
24intothewings.Thebladeboxisdeliberatelyslig.(ly
oversize,to allowa degreeofadjustment,sothistaskmustbe
carriedout
in
conjunction
with
the
fuselage.Theblades
should
reachtotheoppositesideofthefuselage.Mark
theendotthe
projectingpartwitha felt-tip pen.
De-greasethat partof the
bladewhichistobegluedintothewing,and
roughen
upthesur-
face
thoroughly.
Apply
tapetothe
wingrootfairing
on
thefusel-
age,toavoid
excess
resinsoilingthesurface,andcutthrough
thetapeoverthe
joiner
bladeslots.Applyastripoftapeoverthe
topandbottomsurfacesofthe
fairing
also.
Assemble
the
wings,
blades,locating
pegs
andfuselage
"dry"
-i.e.without
glue
-
first,
tocheckalignment.
Bevel
theendofthebladebox
with
a
knite,
to
formadisheden-
try;thishelpsindistributingtheepoxyinsidethebox.
Pour
a
ge-
nerous
quantity
ofslow
-
settingepoxy
(UHU
plus
endfest300,
Araldite)intothebladeboxandlocating
peg
hole
inone
wing,
preferably
withthewingstandingon
itstip,
anddistribute
there-
sinevenly
roundtheinside,usingalengthofmetalrod.There-
sincanbemade
lessviscous
by
warmingit
up
with
aheat
gun.
Allow
airbubblestoescape,
thenre
-
fillMh resin.Applyepoxy
tothe
joiner
bladeandthelocating
peg,
asfarasthemarked
points,
andslidethem
into
the
wing.Remove
excess
resinim-
mediately.lt is importantthatthereis noepoxyleftonthepro-
jecting
bladeandlocating
peg.
Slidethe
wing
ontothefuselage
as
far
asitwillgo,andlineupthewingwiththerootfairing.Apply
tapeoverthe
joint
tofixthetwocomponents
together.Themo-
delisnowleftstandingonthewingtip,fuselageatthetop,until