Multiplex Challenger Notice De Montage page 13

Building instructions
At this stage the lower wing can be fixed to the fuselage and the two
outboard wing struts. Fit two CFRP rods
crossing over as shown. The two undercarriage fairings
also be glued to the undercarriage legs. Fig. 17
7. Installing the aileron linkages
Use a servo tester or your radio control system to set the aileron servo
(Hitec HS-65HB) to centre (neutral), then fit the large double-ended output
lever (supplied with the servo) on the output shaft, and fit the retaining
screw. Attach the servo output arm extension
output lever; suitable screws are supplied in the servo accessory pack.
Locate the position of the pushrods on the servo output lever extension,
and drill 1.5 mm Ø holes at those points; note that the angled ends should
point forward. Now glue the servo in the appropriate opening, followed
⓲
by the fuselage in-fill piece
shown in the picture: glue an M2 x 20 mm threaded coupler
㉝
end of the CFRP rod . Screw a ball-link
it in pliers to prevent it rotating. Attach the ball-links to the servo output

lever using the screws , then thread the pushrods into the ball-links.
Determine the length to the aileron horn, and cut the pushrod to the
correct length before gluing the ball-link to the pushrod. You can now
fine-tune the pushrod length using the threaded coupler; both ailerons
should be exactly horizontal when the servo is at neutral. When you are
satisfied, screw the pushrods to the aileron horns. Fig. 18
The next step is to connect the upper and lower ailerons.
The connections are made as shown in the illustration: glue an M2 x 14

mm threaded coupler to one end of the CFRP rod

a clevis on the coupler, holding the coupler in pliers to prevent it
turning. Attach the clevis to the upper aileron by pressing a clevis pin
through with a small pair of pliers. Mark the length to the lower ailerons,
cut the rods to the correct length, then glue the clevises to the rods. You
can now fine-tune the pushrod length using the threaded coupler, before
connecting the clevis to the lower aileron. Fig. 19
8. Fitting the fin, completing the tail linkages
Glue the fin to the fuselage, and fit two CFRP rods
brace it to the fuselage. Fig. 20 Fig. 21
Use a servo tester or your radio control system to set the elevator and
rudder servos (Hitec HS-40 #11 2040) to centre (neutral), then fit the
large double-ended output levers (supplied in the servo accessory pack)
on the output shafts before snipping off the unwanted end. Drill out the
hole in the output arm to 1 mm Ø. For the elevator we suggest using
the second hole from the inside, and for the rudder the innermost hole.

Glue seven pushrod guides
Fig. 22
The two pushrods are assembled as shown in Fig. 23 : glue an M2 x 14

mm threaded coupler to one end of the CFRP rods

screw a clevis on the coupler, holding the coupler in pliers to prevent
it turning.
Thread each pushrod through the pushrod guides from the front, and
attach the clevis to the servo output arm by pressing a clevis pin
through with a pair of pliers. Note that the longer rod is used for the rudder.
㉙
to the struts on each side,
㉓ ㉔
,
㊽
to the double-ended
. The aileron linkages are completed as


on the coupler, holding
㉜
, and screw
㉕
top and bottom to
in the holes on each side of the fuselage.
㉚ ㉛
,
Complete the linkages as described for the ailerons, but please note that

an adapter tube
can now pushrod in order to obtain a close fit between the clevis and the CFRP
pushrod. Ensure that all the glued joints involving the control linkages are
sound. Fig. 24
Please note that the rudder pushrod must be routed between the fuselage
and the strut to ensure that it can move freely when control commands
are given. Fig. 25
9. Installing the RC components
Fix the motor (ROXXY C27-15-1050kV # 1-01035) to the front face of
the firewall, and attach the speed controller (ROXXY BL Control 715 BEC
# 1-01050) to the lower fuselage section using hook-and-loop tape. The
receiver and flight battery can also be fixed to the fuselage using small
pieces of hook-and-loop tape. When attaching the tape to the battery we
to one recommend the application of a little UHU
it to air-dry for about ten minutes. Fig. 26
10. Centre of Gravity, control surface travels
The model's Centre of Gravity should be located at the 78 mm point,
measured from the leading edge of the upper wing in the centre. The
control surface travels are set to the pilot's individual preference, but
we recommend about 80% EXPO on elevator, 60% EXPO on aileron and
rudder.

, and

has to be fitted in the clevis on the other end of the
POR to the surface, allowing
®
EN
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