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Alpina magic building instructions
Dear modeller,
Many thanks for purchasing a MULTIPLEX model kit
UUlftplgX kits undergo a series ol material and quality
checks, and we are sure you will be satisfied with the contents
ol your kit. However, we would ask you to check all the kit com-
ponents betore using them, as it is not possible to exchange
parts which are no longqr.in new condition.
RC funclions:
Ailerons (optional 1 or 2 servos)
Elevator
Rudder
Airbrakes
Aero -tow coupling
're servo in the fuselage;
--.(o servos in the fuselage;
Two servos in the wings.
Two aileron servos give you the option of electronic aileron dif-
lerential as well as the possibility of using the ailerons as cam-
ber - changing flaps (these facilities must be provided by your
transmitter).
Note: lt is essential that you do not use solvent - based adhe-
sives when gluing wood to styrofoam. Use s-minute epoxy or
white glue.
The fuselage
The first stage is to saw out the cabin frame along the line
marked on the underside, and clean up the cut edges. Check
that it fits snugly on the fuselage. The cabin frame should be
about 1 mm smaller all round than the fuselage.
Bevel the edges of parts 31, 32 and 33 to match the fuselage
curvalure.
The outline of MULTIPLEX Nano, Mini, and Profi servos is die-
stamDed into the servo plate 31. lf you intend using diflerent
servos, alter the apertures to suit.
'e servo olate also includes an aperture torthe On/Otf switch.
-x the servos and servo mounts (if used - not included in the kit)
on the servo plate. lf you intend fitting an aero - tow coupling,
olease use a powerful servo (torque greater than 2.0 cm/kg).
Farts 31, 32 and 33 are now installed in the fuselage in the posi-
tion shown. Check that the fuselage is not pushed out of shape.
Before gluing the parts in place, temporarily install the servos
and connect up the receiving system (servos, receiver, battery,
switch harness) to check that eveMhing works correctly.
Check also that the cabin frame stillfits accurately. lt must not
foul the servo output arms!
Roughen up the fuselage sides where these components are to
be glued, and fix them in place using slow-setting epoxy (UHU
plus).
Caution: Checkthat the fuselage is not distorted when the com-
Donents are installed.
All the holes and apertures required in the wing root lairings
should be cut at this stage. The holes for the rear locating peg
should be 3 mm diameter. The apertures for the wing control
surface linkages in the leading edge area should be pilot-
drilled initially, then filed out neatly to at least I mm diameter.
The slot tor the wing joiner needs to be continued through the
f uselage wall, using a 2 mm drill as a milling cutter. Leave only a
short length of drilIprotruding Irom the drill chuck, and move it
sideways to mill out a slot, using the the rear face of the slot as a
guide. Älternatively, use a tlat file, working from inside the fusel-
äge. Thoroughly roughen up the inside ot the fuselage sides
aiound the slots to provide a key when gluing in the wing joiner.
Wing joiner assembly
Bevel the cross - strut 19 to lit the fuselage interior shape at the
rear of the wing root fairings. Trim it to lit snugly, and glue it in
otace. Check that the strut does not obstruct the rear locating
peg holes.
Roüghen up both ends of the two rectangular brass tubes and
assemble them as shown in the drawing. Slip the two side
cheeks onto them. Check that the tubes are the right way round
- rioht-hand blade to the front, left-hand blade to the rear. Adjust
theirass tubes until only one end of each projects out of the fu-
selage. The other end is lett about 5 mm short of the opposite fu-
selage side.
The iing dihedral is determined by the spacing oI the side
cheeks. ilumerous test flights have shown that a dihedral angle
ot 7 degrees is the optimum figure for balanced all-round Ilying
characieristics. We strongly advise against reducing or in-
creasing the dihedral from this figure. (Dihedral: 3.5 degrees
per wing. Total dihedral : 7 degrees)
Flace thä rectangu-lar brass tubes on the angle iig and shift the
side cheeks until the dihedral is correct. The two cheeks must
be eoui - distant from the centre, otherwise the model will have
difteränt dihedral on each side. Lrark the position oI the side
cheeks on the brass tubing.
Assemble the Joiner clamp as shown in the drawing. Be sure to
lit the copper rivet in the clamp backplate; it is a good ideato se-
cure it with a drop of instant glue.
You can use either a slot - head or allen - head machine screw
as lhe clamp screw.
Caution: Never tighten the clamping screw unless both wing
joiner blades are in place in the tubes, otherwise the tubes will
-be
squashed, and it wilt be difficult to insert the joiner blades.
The next stage - adjusting and installing the wing joiner tube as-
sembly in the fuselage - is of vital importance to the f light cha-
racteristics of your model. Please take particular care here-.
De-grease the wing joiner blades 20 and the locating pegs 24,
andiit them in the wings (do not glue). Installthe joiner assembly
in the fuselage, threading the side cheeks and clamp onto the
rectangular tubes inside the fuselage), and plug in !h9 winS9.
Check that the wings line up with the root fairings, and trim back
the apertures in the fairings until alignment is exactly right.
Check that the side cheeks are positioned at the marked points'
and qlue them to the tubes using 5-minute epoxy. Spot-glue the
joinei assembly to the fuselage sides using 5-minute epoxy (do
irot glue the äisembly permänently). Leave the glue to set for
about fifteen minutes.
Carefully remove the wing panels and joiner blades. lf there.is
any gaoaround the joineitubes, tape overthem onthe outside'
tträ fring joiner assembly can now be permanently bonded.into
the fustäge. Use high-qualitv, slow-setting epoxv for this,
such as UHU plus or MULTIPOXY, thickened with extra-fine
chopped glass rovings. The best method is to work on one side
at a time, änd leave the luselage resting on that side untilthe re-
sin has cured. This prevents any risk of the resin getting into the
wino ioiner assemblv.
Whön- the epoxy has cured, sand back the ends of the joiner
tubes llush with the fuselage root lairings. Take care not to dam-
age the fuselage!
Aileron servo plate installation
The servos for the aileron and airbrake functions are mounted
on a slide, so that they can be litted and removed quickly'
Glue the guide plates 34 on the outside servo plate, with the
edges flush; do not lit the servo plate 31 b at this stage.
lmportant: take care that no glue gets into the guide channel.
Mount the servos in the prepared apertures and fit the slide into
the guide channels; round off the edges of the servo plate.if ne-
cesöary. Glue the reinforcing plate 35 centrally on the frontface
of the 3ervo olate. Drill 1.5mm diameter holes at the marked
points inthe reinforcing plate, andfixthe servo slide to the guide
channels using the screws 36.
It the ailerons ;nd airbrakes are to operate smoothly and reliab-
lv it is essentialto installthe servo plate in exactlythe right posi-
tion. Slip the aileron and airbrake pushrods 48 and 49 in the ou-
ters, leaving the root ends proiecting, and plug the wings into
the fuselage. Shift the servo plate in the fuselage untilthe pusn-
rods run exactly across the correct linkage point on the servo
output arms. The cables should be perfectly straight - do not al-
Specification:
Wingspan:
Fuselage length:
Wing area:
All- up weight:
Wing loading:
Wing section:
Tailplane section:
3800/4400 mm
1 7 0 0 m m
65/74 sq dm
ca. 37009
57l50 g/sq dm
Ritz combination
NACA 0009
1 5
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