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sides of the fin slot; trim out the slot if necessary' The root ribs
itroutO meet the fin root fairings snugly and squarely- .
Remove the tailplane and pivot dowels, and glue the plvot tuoe
in place by applying a little instant glue from the outslde l aKe
;;i;;;
td "q-"ä te-the fin inwards;it is best to fitthe f in post 29
temporarily to avoid this.
Cnecf tnai ttre crank moves freely over its entire arc of move-
Äeni. anO sanO oack the ends of the pivot tube flush with the fin
skin if necessary; work carefully here, and protect the sur-
rounding area ofthe fin surtace with tape to prevent damage'
The rudder
The first step here is to trim the lin post 29 to Jit snugly in the
iäifing edge ofthe fin. lt should be located parallelto th^e.trailing
äaqä äitü tin moulding, recessed bv about 8 mm Glue it.in
püä wittr epoxy resin. Place scrap wood strips on either side'
and press the sides together with small crew clamps untll tne
iäiiri nas set traro. Here is a usefultip: before gluing the tin post
in olace. fix the spreader strips in the correct position with small
oiäces öt oouUte-sided tape. The clamps will then be easy to
ättäCn. Sigt't atong thefin from aboveto checkthat it is nottwist-
ed. and iinecessäry undo the screw clamps and re-align the
t]n. ti ij essentiat tträt tne tin is in line with the tuselage centrel-
i n e .
fite out ttre rounded areas at the top and bottom of the fin, as
shown in the drawing. Cut holes in the lin post 29 lor the hinge
luqi 59. They are tocäted about 50 mm from the top and bottom
i'i
- oritt th; hotes 4 mm diameter, then file them out to fit the
h"roe luqs. TheY must be central
öui'trrelöaoing äoge strip 47 to length, glue it to the front face.of
the rudder, and sand the edges flush Mark a centrellne on tne
irontläce öt part +7 from top to bottom, and glue the hinge tube
ii exactly alöng tnis line, using instant glue. Fitting the pivot rod
57 in the tube will help to keep it straight.
Glue the in - fill strips 58 on either side of the pivot tube, and glue
tträ tront strip 47 bn top. Tape all the parts in place Sand all
edges flush.
Thä next stage - rounding off the rudder leading edge
- must be
carried out \,iith particular care, as the fit of the rudder to the fin
ücruii"ttottt" dppearance of the whole tailgroup Keepstrictly
iä it'ä cross - seötions shown, and check the fit continually bv
offerinq the rudder uP to the fin
ihe ruäoer hinge lug positions are now transferred to the rud-
Oäi. ee sure toättow fbr the top and bottom strips 23 Remove
the Divot rod 57 and cut a horizontal slot 4 mm wide across the
iuääer teading edge at the marked points. The slots must be
deeo enough lo cut right through the pivot tube'
Insert the pivot rod in the rudder, and push the hlnge.lugs oacK
until vou feel them snap onto the rod. Check that the hinge lugs
iotätä treety, anO trim the slots it necessary' Checkthatthev line
r
:orrectly wilh the holes in the fin post.
ir,e iudoeimust be installed central to the fin To ensure that
itris ijttre case, tit a thin strip of card between the fin and rudder
än Oottr siOes. g" careful not to push the rudder in so lar that it
cannot be deflected. About 30 degrees movement is necessary
on both sides. Apply s-minute epoxy to the rudder hinge.lugs
and the fin post holes, and plug them in as already descrloeo'
iäo" ttr" r.uäa"t in pläce. When the epoxv has set, check that
thärudder moves fräely to both sides. lt can be removed at any
time by pressing it out ot the hinge lugs.
Cut the pivot rod llush and glue the top and bottom blocKs zc Io
the tios of the rudder. Sand the blocks to a rounded sectron' to
match the fuselage.
StiOe ttre steet pulhrod 48 into the rudder bowden cable outer
änO mä* wnetä it crosses the rudder' Cut a slot for the rudder
noin CS tooteo l.3mm diameter), and glue the horn in the slot'
Aoolv taoe around the slot to avoid excess resin soiling tne sKln
r'frä Ädiä l" instalted almost within the thickness of the rudder,
üriählJrinäiit ooes not foulthe luselage side. Bend the.final
I mm of the rudder pushrod at right - angles' and connect ll to
the rudder horn. The connection is quite secure, and neeos no
further fixing.
The wings
The first stage here is to sand down the trailing edges Work ca-
i.irLtu. to "ciieue an even thickness of no more than 1 mm Take
"är" äiso to maintain a smooth airfoil shape Particular care is
näeded wnen sanding the ailerons; be sure to keep the wings in
their foam negative shells when sanding. The leading edges on-
lv require a light sanding.
6eoaäe ttre"aireron fro-m the wing panel by cutting at right-
anqles to the fuselage centreline at the end of the machlned slor
äüiitä ""ä"i"io" Rimove a strip 7mm wide f rom both ends of
tt'e äit"ron, to provide clearance for the balsa sealing strips'
sjnd tne aiteroir leading edge perfectly straight The machining
Drocess leaves rounded corners to the machined slot; these
should be sanded out square.
öriin" äit"i"" recess seäling strips 47 to the lengths required
and trim them to fit. Glue them to the wing, using tape to holo
ihem in olace, and sand theedgesflush. Please notethatthetop
i,äoä - i,t'iln later forms the äileron hinge line
- must be lett
inäro. Otfer up the aileron to the wing and check that it fits ac-
curately.
WnJn ättactring the sealing strips to the ailerons it is vital not to
distort the panlls. Weight them down on a flat board, with the
f"ääing "Og" projectind slightlv, and leave them in this position
untit tnä qt;e Äas-set. Giue the sealing strips 47 to the end faces
of the ailäron, and sand them back flush. Offer up the aileron to
thewing, and sand back as required. The gap between wing and
aileron at either end should be about 1 mm'
The lollowing section describes two methods of actuating the
a erons:
f. ihe orthodox linkage using servos in the fuselage and bell-
cranks in the wings.
2. The system based on wing - mounted servos
Aileron bellcranks
Drill a 3 mm diameter hole in the bellcrank mount 43 where
marfeO. nssemOte the bellcrank 44 as shown in the drawing'
änä äi"*
ii io tn" mount Be sur€ to make one left - hand and
onö riont - trano assembly. The crank must rotate freely, but wi-
ttrout ötay. lf there is a little axial movement, rub the inside.sur-
iäöääiJ'i" ättt'" twoflanged bushes on 4oo grade wet-and-dry
abrasive paper to remove a little material. Adjust the tightness or
ttr" oiuot äcie* curefully, and secure the nut with 5-minute epo-
xv when vou are satisfied.
dä-ouir tire enOs of one steel pushrod 48. Pass it into the front
OoJOen caUte outer tube from the wing root end,-and slide it as
far as the bellcrank. Pull the end of the rod out of the bellcranK
il"rriiärär". it'*äo a clevis 40ontothe end' and bendthetinal2
Ä-"i oiüiä,i,ii" "t iisht - angles. slide the link right to the end and
läiOär ii sounOtv to-the rod Connect the clevis to the bellcrank
fu-.i* if,ä t'of" inown on the plan) and fitthe bellcrank mount in
ihe wing well. Refer to the drawing for the correct linl(age noles
and bellcrank orientation.
ön""xtt'ättt'" u"ricrank rotates freely when the rod.is operated'
Shift the bowden cable outer tube in the wing' and
pull lt oacK
iäm ine aiteron uellcrank weltiust far enough to ensure that the
äreuii ooäs not toul it at maximum movement lt is important not
to move the bowden cable outer more than is absolutely neces-
"ä. f ra*itut
10 mm from the clevis at full throw), to prevent
inä'"iäel iöo tr"ting under compression. check th€t the.bell-
crank and the associated linkage do not touch the toam aI any
point.
itre uowden cable outer is normally free to move inside the
wino. lf vou find it is fixed, twist a small round file into it at the.rool
enol Cäreiurrv twist the tube to and fro until it is released lrom
it'" *inq ir.in. oo not use force under any circumstanc€s The
6owaäriCaote outer can now be shifted as required Take great
ääre not to putt it out too far, as it is exceedingly diflicult to
push
it back into the wing again.
öeitt'e o"ilcrant t;its-neutral position (long arm parallel.with
the fuselaqe centreline) and mark where the threaded
pusnroo
lC crosseä tne sealing strip when the rod is at right
- angles.to
tt'eäifeön leading ed-ge, and the rod is pointing exactly to the
connection point on the shorter bellcrank arm using a
polnleo
iounätire "r.it atunnelfrom the sealing strip through the.foam to
the bellcrank well. Remove as little foam as possible' to-avolo
ünnäcJisäriry weakening the structure' Screw a clevis 40 onto
tnä tnreaOeobustrrod, and bend the rod as shown in the draw-
inä. Fass it tnlousn the tunnel and connect the clevis to the bell-
cränk. Hold the aileron against the wing, with equal cle^a-rance
at
either end, and mark the position of the aileron horn 3u (orllleo
i7 mm oiänieterl. rile outihe horn slot in the aileron untilthetop
"iin i" ui"ioi"-nppry strips oftape round the slotto avoid soiling
1 7
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