Multiplex D-8671 Bauanleitung Seite 11

Building instructions for the Multiplex ASW 22
Use the following adhesives during construction:
Foam-wood: white glue, Devcon s-minute epoxy, Copydex;
Wood-wood: white glue, instant glue (cyano-€crylate),
Uhu-hart, Thixofix (contact cement);
GRP-wood: Araldite, epoxy resin thickened with micro+alloons or
other lightweight filler powder (use s-minute epoxy to
hold parts in place initially);
GRP- metal: Araldite.
Tailplane See page 3 O+@
lmDortant!The tailolane is built inverted. and is turned overwhen comDle-
ted. This is essential to ensure a straight hinge line between elevatorand
tailplane to guarantee lull elevator movement.
Join the two tailplane sheeting components 1, using sellotape. Do Dot glue
the parts together. Mark the position olthe ribs on the sheeting. File out a
neat, 10 m.m. U hole lor plastic screw 21. Pin down the top tailplane sheet
on the building board, with thetaped side down. Glue balsa spars3 and 4
on either side ot the joint line, using instant glue (cyano-acrylate). Take
care notto gluethetwo stripstogether. Slidejig strip 2 underthetront edge
ofthe sheeting, with the raised end inside, and pin ittothe building board.
Sand injill block 5 to section, using rib 8 as atemplate. File out a 6 m.m. O
hole in it to take the hollow rivet. Glue the in-fillblock 5 tothe sheeting, as
shown on the plan. Glue in-tillblock 6 and spar doubler 7 in place. Gluethe
elevator ribs and the tront section of ribs 8-16, using instant glue. Plane
down spars 3 and 4 and in-till block 6 to follow the line ofthe tailplane sec-
tion, and sand them smooth. Sand the tops ofthe ribs, using a long san-
ding block.
Taperthe whole length olthe trailing edge otthe bottom sheeting (on the
side to be glued); the taper should be about 6 m.m. wide. Apply contact
glue to the side ol the bottom sheeting to be glued, and also to the ribs,
sparsand trailing edge olthe panelon the building board. Allowtheglue to
airdry tor a tew minutes, then place the sheeting on the paneland press it
down. Remove the tailplane from the building board, sand it smooth, and
attach leading edge strip 17 and tips 18. Sand the leading edge and tips
smooth. Cut through the tip in line with the joint line of spars 3 and 4,
removethetape and detach the elevator, using a sharp knife if necessary.
Bevelthe faces ot spars 3 and 4, as shown on the plan. Continue the hole
for retaining screw 21 though the underside of the tailplane; lile out the
hole already present in the top side, using a round file. Counteöoreforthe
screw head. Check that the hollow rivet and plastic screw fit in their
respective holes, and that the counteöore is deep enough. lf necessary,
file out to suit, but do not glue the rivet in place yet.
Sand the edges of the tailplane support 19 to a bevel and glue it to the
underside of the tailolane. Please note that the side without the comoo-
nent number is the reverse side, i.e. the side to be glued. Cut away the
underside of the tailplane inside the cut-out of part 19. Glue the hom in
place, using 5-minute epoxy, as shown in the plan. To dothis, you willneed
to file out a slot in the elevatorto acceptthe hom. Please note that the cen-
tre of the horn hole should be 15 m.m. from the hinge pivot axis. Replace
the hollow rivet and the retaining screw, and cut the rivel to length.
Rudder See page 4 @
Sand a taper into the trailing edge of the sheeting 23, about 7 m.m. wide.
Glue the right and left sheets together along the trailing edge. To do thß,
pin downthe right-hand sheet on the building board and marktheposition
ofthe ribs on it using atelt-tip pen. Apply instantglue (the thickervariety)to
the tapered edge and glue the lett-hand sheet to it. Remove the sheeting
from the building board and slide the individual ribs 24-28 into place.
Press the sheeting against the ribs with your fingers, and run instant glue
along thejoints. Rib 29 should be glued flush with the bottom edge ofthe
rudder. Sand the tront lace of the rudder. Markthe centreline on the false
leading edge strip 30, using a felt-tip pen, and glue plastictube 3l exactly
central on it, using instant glue. Glue strips 32 on either side ot tube 31.
Glue leading edge strip 33 to this assembly. The complete leading edge
can then be glued to the front lace oflhe rudder, and sanded flush with the
top and bottom edges. Glue end piece 35 in place, and sand ittofollowthe
rudder section. Sand the rudder leading edge to a semi-circular section.
Checking the rudderfor fit, cutting the slotsforthe hinges, and installation
ol the rudder horn are canied out at a later stage.
Rrselage See page 5 @
Mark the position olthe holetorthe tailplane retaining screw on thetop of
the fin, and drillit outto 6 m.m. O. Fit nut 22 intothe fin from the rear, open
face, and glue it in place with slow-setting epory (Araldite). Thicken upthe
epoxy with glass fibres or micro balloons. Leave the tuselage inverted
while the resin cures. Flle the seam line of the tailDlane seal area flat, and
tile off any excess nut length. Mark the position ol the hole forthe elevator
crank on the tailplane seal as shown on the plan, and cut it out with a thin
hacksaw blade. Assemble the elevatorcranktrom the two ply parts 42 and
the core piece 41, gluing them togetherwith the edges flush. Note lhat the
two arms ofthe crank are not the same length. At each end olthe crank a
ball-link 46 is fitted, using M2 screws 47 to securethem. To dothis, drilla
1.5 m.m. O hole in the crank at either end, and drive in an M 2 screw. Press
the ball out of the plastic link. Remove the screw, apply 5{inute epory to
the hole, and screwthe screw back into the hole. Wpe off any excess glue
immediately. Drillthe 4 m.m. O hole in the elevator crank to take the pivot
tube 43, and glue the pivot tube into the crankwith 5-minute epory, taking
care that it is exactly at rigth-angles to the crank. Roughen up the tube
surface before gluing, and check that an equal length oltube projects on
either side. Drill 3 m.m. O holes where marked in the crank supports 40.
Countersinkthe hole on onesidewith a largerdrill (approx.8 m.m. O), so as
to obtain an adequately largegluing surface when installingthe pivottube
later. Glue reinforcements 39 to the fuselage stem post 38, as shown on
the plan. Glue one crank support 40 in the recess in the stem post, taking
care to fit it in the conect position and at right-angles to the post. The
recess in the stem post to clearthe rudder linkage should b€ located on
the left-hand side, when viewed from the rear. Roughen up the pivottube
44 at both endsforabout 3 m.m., and push it into the crank support, flush
with the outside tace. Fit one washer 45, the elevator crank and a further
washer45 onto the pivottube, followed bythe second crank support, and
fit the second support into the recess in the stem post; do not glue yet.
The elevator crank is now adjusted for correct alignment. lt should lie at a
slightangle to the centreline ofthe stem post. The top arm must be located
exactly in line with the centreline of the stern post, and the bottom a
should be otfset 5 m.m. tothe leftwhen viewed from the front. lf necessatyi
file out the holes in the crank supports until this is so, and when satistied
gluethe second crank support to the stem post, using instantglue. Epory
the pivottube 44 to the cranksupports,taking care nol to gluethe crank at
the sametime. Press the two crank supportstogether lightlyatthefront, so
that the elevator crank has minimum lateral movement.
Solder a threaded coupler onto a steel pushrod, 1.3 m.m. O by 1250 m.m.
long. Roughen up the.ioint surface betorehand, and bend thesteelrod into
agentle "S" shape to ensure a good mechanicallit. Slide slifiening sleeve
48 into place as far as the threaded coupler, and temporarily attach the
couplerto it with a strip ol sellotape. Cut down the threaded portion ot the
threaded coupler, leaving I m.m. ot threaded length, and screw a ball-link
connector onto the coupler until it butts up against the tapered section.
The threaded portion ot the coupler should not be visible at all. Press the
ball-link connector onto the ball lixed to the bottom end of the elevator
crank (the longer arm). Mark the position ol the stem post 38 on the inside
otthe fin, using afelt-tip pen. The line should be 10 m.m. inboard ofthe tin
trailing edge, and parallelto it. Fit the stern post and elevatorcrank intothe
fin, and align it carefully. Measure the neutralposition ofthe cranktrom the
plan and mark it on lhe tailplane seat althe top otthe fin. The ballat the top
end of the elevator crank should just project out ot the tailplane seat. It
necessary, cut backthe top or bottom end otthe stem post untilthis isF^
The tuselage isjoined with thickened resin in this area, so it is quite po.._?.
ble that the stem post length may need to be adjusted. Checkthatthe ele-
vator crank can move lreely. The rod stitlener 48 musl not be able
to strike the bowden cable outer which is bonded into the tuselage;
shorten the stitfener tube it this is so. Remove the assembty again, and
glue stitfenertube 48 permanently to the steelrod, using s-minute epoxy.
Roughen up the inside of the fin where the stem post isto be glued, using
grade 80 glasspaper. Glue the stem post in place, using slow-setting
epoxy, and applythickened epoxy to the outside ol the crank supports 40
at the same time. Whilethe epoxy is setting, press the outside edges otthe
fin trailing edge togetheron eitherside ofthe stem post, using smallscrew
clamps and two strips of straight hardwood to spread the load (not inclu-
ded in the kit). When clamped up, check carefullythat thetin isnottwisted.
When the eioxy has cured the tudder can be checked lorfit. The rudderis
hinged bythe knuckle-joint method, which eliminatesthe usualgap. Drill
outthe pivot holes ofthe rudder hinge bracketslo 2 m.m. O. Cut slots in the
stem post andfitthe hing€ brackets 36 intothe slots. The pivot hole should
lie about 1 m.m. outside the trailing edge ofthe fin sides. Place the rudder
against the fin and mark the position olthe hinge brackets on the rudder.
Cut slots in the rudderto acceptthe brackets, using athin hacksaw blade,
then file them out to a width ot2 m.m., using a tlat needle file. Be sureto cut
through the plastic tube 31, which is already in place in the rudder. Fit the
rudder onto the hinge brackets, and thread the smaller plastic tube 37
through lhe rudderand the hinge brackets. The plastic innertube should
be a fairly tighttit in the hinge brackets. The hinge is lormed by one plastic
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