Multiplex Tucan 21 4284 Notice De Construction page 17

10. Installing the tail servos (pic. 18 & 19)
Connect a 30 cm long servo extension lead, # 8 5031, to the
Tiny-S rudder servo, # 6 5121, and tape the Uni connectors
to prevent them working loose. Cut down the servo output
lever to the length shown in Fig. 18, and thread the rudder
pushrod 47 (1.5 Ø x 80 mm) through the servo output arm
using the hole shown. Feed the servo lead through the
duct in the fuselage, and place the rudder servo - with
pushrod attached - in the appropriate recess. Check from
the transmitter that the servo is at centre, then fi x it to the
foam by applying hot-melt glue to the mounting lugs. Set
the rudder to centre (neutral), and tighten the grubscrew
in the barrel connector. Tighten the servo output screw to
secure the output arm.
11. Preparing the wing retainer system (pic. 20 & 21)
Glue the circular plywood discs 33 to the transverse plate
32, then press the captive nut 44 (M6 x 8 mm) into the hole
from the underside; you may need to tap it into place with
a hammer. Secure the nut with adhesive.
Glue the two side pieces 31 to the sub-assembly you have
just prepared.
12. Gluing the wing retainer system to the wing centre
section (pic. 22 & 23)
Place the wing retainer assembly in the top of the wing
centre section 9, position it accurately, and glue it in place.
Glue the former 35 to the foam part.
Slide the CFRP tube 72 (8 Ø x 370 mm) into the foam
part from the side, and pass it through the openings in the
wing retainer assembly. The tube should end fl ush at both
sides. Glue it in the correct position, applying adhesive to
the whole surface.
13. Gluing the outboard wing panels to the centre sec-
tion (pic. 24)
Apply adhesive to the mating surfaces. Place the right-
hand outboard wing panel 8 on the centre section 9 from
above, and position it carefully. It is a good idea to spray a
little activator on the surfaces to ensure that the joints cure
quickly. Repeat this procedure with the left-hand outboard
wing panel 7.
14. Gluing the spars to the wings (pic. 25)
Cut down two GRP rods 73 (1.3 Ø x 510 mm) to a length
of 480 mm. Glue one part 73 and one CFRP tube 71 (8 Ø
x 470 mm) in the appropriate channels in the underside of
each wing panel.
Note:
Lay each wing panel down fl at when working on it, to avoid
warps.
15. Completing the ailerons (pic. 26 & 12)
Prepare two aileron horns 38 as described in Step 7; take
care to produce a handed (mirror-image) pair, as shown in
Fig. 12. Glue the horns 38 in the recesses in the underside
of the aileron of each wing panel.
Cut through the ailerons at each end to release them. Move
the ailerons up and down to free up the hinges, but take
care not to defl ect them too far - on no account separate
the ailerons from the wings!
16. Installing the wing-mounted servos (pic. 26)
Cut down the output arms of the Tiny-S servos, # 6 5121, as
shown in Fig. 26. Connect the aileron pushrods 46 (1 Ø x 50
mm) to the output arms, and fi t the servos in the outboard
wing panels 7 and 8. Check from the transmitter that the
servos are at centre, then fi x them to the foam by applying
hot-melt glue to the mounting lugs. Connect a 30 cm long
servo extension lead, # 8 5031, to each servo. Finally set
the ailerons to centre (neutral), and tighten the grubscrews
in the barrel connectors.
17. Installing the undercarriage mountings
(pic. 27 & 28)
Glue the undercarriage mount 36 to the reinforcements
34 as shown in Fig. 27 to produce the mounting for the
right-hand undercarriage unit; check that the holes line up
accurately.
Repeat this procedure for the left-hand side, using the
plywood parts 36 and 2 x 34. It is important to produce two
mirror-image sub-assemblies (different left and right).
Place the right-hand undercarriage mounting in the ap-
propriate opening, position it carefully, and glue it in place.
Repeat this procedure with the left-hand wing panel.
18. Installing the fi xed main undercarriage (included in
the kit) (pic. 29-33)
All the parts required for this stage can be found in the bag
marked "Tucan undercarriage set".
Drill a hole of around 4.5 mm Ø at the points marked L and
R in the plastic main undercarriage brackets 62. Slide the
wire main undercarriage legs 58 & 59 through the brackets
from the underside, and screw these assemblies to the
covers 63 using the self-tapping screws 67 (2.9 x 9.5).
The undercarriage assemblies can now be installed in the
outboard wing panels 7 and 8 as shown in the illustrations,
using the self-tapping screws 67 (2.9 x 9.5).
Screw an M3 x 3 socket-head grubscrew into each collet 68
(4 mm) to a depth of about three full turns. Slip one collet
68 / 69 onto each wheel leg, followed by a wheel 61 and
another collet 68 / 69. Position the collets in such a way
that the wheels rotate smoothly and freely, then tighten the
socket-head grubscrews fi rmly.
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