Multiplex CARGO Instrucciones De Montaje página 15

Important note:
You will find a thin wire which exits the motor case at each of
the motor terminals. This wire is one pin of the suppressor
capacitors which are built into the motor, and it must be
soldered to the motor terminal when the power cable is
soldered to it.
Solder the supplementary 47 nF capacitor 98 across the
motor terminals. To prevent short-circuits, slip pieces of
insulating sleeve 99 on the capacitor pins. The power cables
can now be soldered to the motors: red to positive and black
to negative. Note that this only applies if you are using direct-
drive motors. If you are installing geared motors, swap over
the connections to reverse the motors.
13 Installing the motors in the wings
Glue the motors 94 in the motor pods using a few drops of 5-
minute epoxy applied to the motor can. The motors must
make good contact inside the motor pods, to ensure correct
alignment.
Geared motor (option) 2 x MPX Order No. 33 2693
Each 400 L gearbox conversion set includes two gearboxes
and matching propellers. The standard motors 94 supplied
in the kit are used for the conversion set. Install the gearboxes
as described in the instructions supplied with the set.
To install the geared motors the plywood plates supplied in
the kit have to be glued in the motor pods. Remember to
connect the power cables to the motors the opposite way
round, as the single-stage gearboxes reverse the direction
of rotation. Solder the power cables to the motors: red to
negative and black to positive. Glue the geared motors to
the plywood plates, and apply a few spots of epoxy to the
motor can to attach the motors to the motor pods. Take care
that no glue gets on the moving parts of the gearbox or in
the motor.
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14. Gluing the main spars and screw-hooks in the wing
Check that the main spars 50 fit snugly in the wings, and
trim if necessary. Glue the spars in the wings using 5-minute
epoxy, taking care to keep them flush with the wing surface.
Wipe off excess resin immediately, and remove all traces of
epoxy with meths on a rag.
Fit the screw hooks 88 in the root ribs at the punched points
and secure each one with a drop of glue.
15. Gluing the main undercarriage units in the wings
Check that the previously prepared undercarriage assemblies
are an accurate fit in the wing recesses, and that they make
good contact with the main spar. Trim the plates if necessary
to obtain a good fit. Mix up some thickened 5-minute epoxy
and glue the main spar 50 in the wing, initially taking care to
obtain a sound joint with the joiner tube 61 - on this rare
occasion use plenty of epoxy - and immediately glue the
undercarriage assembly in place while the epoxy is still soft.
Tape the undercarriage assembly in place carefully, then place
the wing on its leading edge / motors while the glue cures.
16. Attaching the wings to the fuselage
Fit the GRP joiner tube 60 through the plywood box (loading
bay), fit both wing panels on the joiner, and secure them by
stretching the rubber band 84 between the screw-hooks. Now
offer up this whole assembly to the fuselage, check the fit,
and carry out any trimming required. The root ribs must rest
snugly in the fuselage recess, and must line up correctly
with the airfoil contours. When you are satisfied that this is
the case, apply a thin coating of epoxy to the inside of the
fuselage where the plywood box fits, and also to the front
and rear formers, then place the box and the wings on the
fuselage and align the parts accurately.
Caution: the wings must be removable for transport, so take
care not to glue them permanently to the box or the fuselage.
Using a 2 mm Ø drill, or a length of wire with a pointed tip,
remove the styrofoam behind the 2 mm Ø holes in formers
31 and 32 to a depth of about 5 mm.
Trim the hand-hold plates 35 to fit in the fuselage in-fill pieces
7 and 8, and glue the parts together.
Trim the fuselage in-fill pieces to fit in the fuselage, and glue
them to the plywood box, taking care to keep the glue away
from the wings. Keep an eye on the resin until it is just starting
to set, then carefully remove the wings before it has a chance
to cure fully. With the wings removed you can check the glued
joints in the plywood bay area, and apply more epoxy to
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reinforce the stressed areas if necessary.
17. Preparing the loading bay cradle and trimming it to fit
The loading bay cradle 21 simply clips into the loading bay,
where it conceals the cables, RC components, hooks and
wing joiner. This means that you can place a load in the bay,
such as small parachutists, without the danger of cables being
dragged out when they fall, or becoming tangled up in the
parachute lines.
Cut out the loading bay cradle along the marked lines using
a small pair of scissors. Cut slots either side of the clip lugs
as shown in the drawing, slide the cradle into the fuselage
and check that the clips engage correctly in the plywood sides.
To disengage the clips, slip a flat-head screwdriver behind
the lugs and withdraw the cradle.
18. Preparing the loading bay doors
To complete the loading bay doors 9 and 10 the following
parts have to be prepared:
Two 35 mm long hinge tubes 64 and two 45 mm long hinge
tubes 65; cut these from bowden cable outer sleeve material.
Roll the sleeve on the building board under a sharp balsa
knife to cut it cleanly.
Two 40 mm long hinge pins 69 and two 65 mm pins 70, cut
from aluminium rod. Cut the rod with pliers and file the ends
smooth.
Bend the final 10 mm of the longer rods at 90°. The loading
bay doors are opened and closed using the horns 82; the
first step is to fit the pushrod connector 91 in the inner 2.5
mm Ø hole in each horn. Secure the connectors with the
washers 92 and nuts 85. Make up one left horn and one right
horn in this way.
Trim the reinforcing strips 49 to fit in the loading bay doors,
and cut away material as required in the horn recess. Glue
the strips in place and weight the loading bay doors down flat
while the glue hardens.
Glue the horns in the recesses in the loading bay doors using
5-minute epoxy; note that the row of holes must face the
outer wall of the fuselage, and the pushrod connector must
face the tail.
Glue the hinge tubes 64 and 65 in the slots in the loading
bay doors using 5-minute epoxy, and leave them projecting
beyond the styrofoam by about 0.5 to 1 mm at the front end
to provide clearance. Take care not to get glue in the tubes.
Check that the doors fit neatly in the underside of the fuselage,
and epoxy the hinge pins 69 in the hinge tubes 64, leaving
about 5 mm of rod projecting.
Install the loading bay doors and secure them by sliding the
hinge pins 70 into place. Twist the pin until the angled end
fits in the slot, and secure with a strip of adhesive tape.
Connect the loading bay door servo to the receiver, and fit
the output lever in such a way that 45° travel is obtained in
both directions from horizontal.
Connect the U-bend of the loading bay door pushrods 71 to
A
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