Multiplex 21 4215 Anleitung Seite 25

position. Wipe off excess glue at the pivot line.
Allow the glued hinge joints to set hard, then assemble
the tailplane and elevators again, but pushing the hinges
only ¼ of the way into the tailplane. Apply cyano to both
sides of the hinges as described previously, then push the
elevators into final position. Wipe off excess adhesive
immediately. Fig. 13
Fit the pushrod connector on the elevator horn as shown
in Fig. 14, and lock the nut with a drop of paint or glue.
9. Gluing the tailplane to the fuselage
Offer up the tailplane to the fuselage and check that it is
an accurate fit, and that it can be aligned properly. Glue it
in place using cyano, and align it accurately before the
glue sets hard. Fig. 15
10. Preparing the fin
Cut the slots for the hinges 42 in the tailplane 15 and the
rudder 16 using a sharp balsa knife, as shown in Figs. 16
- 17.
Ensure that the slots are in line with each other, and are
exactly central.
Install the hinges "dry" and check that the rudder is
aligned correctly and moves freely. Dismantle the parts.
Fit the tailwheel wire 77 through the tailskid bush 45 and
the rudder horn 44, and bend the end at 90° as close to
the horn as possible, as shown in Fig. 18.
Glue the horn 44 to the rudder, but apply the cyano to the
underside only. Now cut a slot about 1.5 mm deep above
the horn to accept the tailskid wire.
Push the hinges about ¼ of the way into the rudder, apply
cyano to both sides, then immediately push them into final
position. Wipe off excess glue at the pivot line.
Allow the glued hinge joints to set hard, then assemble
the fin, rudder and tailskid wire 77 again, but this time
pushing the hinges and the tailskid bush 45 only ¼ of the
way in again. Apply cyano to both sides of the hinges as
described previously, then push the rudder into final
position. Wipe off excess adhesive immediately. Fig. 19
Swing the tailwheel wire 77 over the rudder horn 44, align
the parts and glue the wire to the slot in the rudder, using
plenty of cyano to obtain a sound joint. Fig. 20
Fit the pushrod connector on the rudder horn as shown in
Fig. 21, and lock the nut with a drop of paint or glue.
Glue in rudder fin Fig.22
The tailwheel 78 can now be fitted to complete this stage:
fit a retaining collar 79 on the wire, followed by the wheel
and the second collar. Apply a drop of cyano to the two
wheel collars 79.
Caution: apply the adhesive on the tip of a small
screwdriver or similar tool. Take care not to glue the
wheel to the axle! Fig. 24
11. Installing the main undercarriage mount
Offer up the undercarriage mount 76 to the recess in the
fuselage. Press it into place "dry", so that the locating lugs
push their way into the foam, then simply glue it in place
with cyano. Fig. 24
12. Preparing the wheel spats (replacement part No.
22 4204)
Glue the wheel spat brackets 75 in the outer wheel spat
shells 19 / 20 on both sides. Fit the collet 72 and the 5
mm socket-head grubscrew 74. Close the wheel spats by
gluing the inner spat shells 17 / 18 to the outer shells 19 /
20 using cyano. Figs. 25 - 27
13. Completing and installing the main undercarriage
Fit the inner collets 72 as shown in the picture, and fit the
wheels 71 together with the assembled wheel spats on
the undercarriage unit 70. Align the parts carefully. Fit the
outer collets 72, and tighten the grubscrews to fix the
wheels and spats on the undercarriage.
Fig. 28
Push the undercarriage unit 70 in the undercarriage
mount, make sure it snaps into place, and secure it with a
drop of cyano. Fig. 29
14. Installing the motor
The motor must be attached to the motor bulkhead 61 in
such a way that the end of the shaft is located about 10
mm beyond the front face of the bulkhead. Fig. 30
For most power plants you will need to fit packing behind
the motor to achieve this. The kit contains a spacer ring
63 which is suitable for the recommended Himax motors
(long shaft).
15. Attaching the motor bulkhead to the motor
mounts
The design of the motor mounts 60 and the motor
bulkhead 61 allows you to adjust the sidethrust and
downthrust of the motor. When the four adjustor screws
64 are fitted flush, the mount is already installed
asymmetrically; this arrangement gives maximum
sidethrust and no downthrust. Make the following
adjustments to set the motor thrustline at the correct initial
angle. Note that we are working from the rear of the
bulkhead.
Upper left adjustor screw
turn
Upper right adjustor screw
turns
Lower left adjustor screw
turns
Lower right adjustor screw
turns
Figs. 31 + 32
The correct sidethrust and downthrust are established in
an initial careful test-flying procedure, and when this is
completed you should use a sanding block and new
abrasive paper to sand down the nose of the fuselage to
align it with the spinner, as the final curvature varies
according to the sidethrust and downthrust of the motor.
16. Completing the canopy
Insert the latch tongues 33 in the canopy latch clips, and
0.5 mm = approx. 1
1.5 mm = approx. 3
0 mm = approx. 0
1 mm = approx. 2
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