Work on the wing is limited to attaching the camber-changing flap and ailerons and installing the
servos.
The first step is to hinge the flap and ailerons to the wings using the procedure already described for
the elevators.
The flap must be able to deflect down and up when actuated by the servo. To cater for this movement
the flap leading edge is tapered asymmetrically, i.e. a cross-section of the flap leading edge exhibits a
right-angle at one edge. The flap must be attached to the wing with the right-angled edge at the top.
The camber-changing flap servo can now be installed.
First cut away the covering film from the wing centre section over the flap servo well. We recommend
that you cut 4 or 5 mm inside the line, then iron the projecting film down and onto the ribs and spar.
Fit the servo in a heat-shrink sleeve and shrink the sleeve round the servo.
The advantage of this method of servo mounting is that the servo can easily be removed for repair or
maintenance: all you do is slit the heat-shrink sleeve and lift the servo out.
The servo should be glued into the wing centre section with the output shaft parallel to the wing trailing
edge as shown in the photo. Locate the linkage hole in the servo output arm which is 13 mm from
centre and drill out this hole to 2 mm Ø.
Route the servo lead out of the rear hole in the bottom wing skin.
Two extension leads have to be fitted in the wing centre section for connecting the two aileron servos
(Order No. 3935.65). Remove the plastic connector housings carefully using a pin: see photo.
Wrap a piece of tape round the bare contact ends; the extension lead can now be slipped into the
plastic sleeve working from the outboard rib, or pulled through using a length of 0.8 mm Ø steel wire.
Fit the plastic housing back onto the contacts. Important: make sure they are in the right order!
approx. 8 mm
Drill a 3 mm Ø hole in the camber-changing flap exactly in line with the servo output arm, as shown in
the photos.
Cut down the horn spigot to suit the thickness of the flap. Drill out the outermost hole to 1.6 mm Ø and
glue it in the flap as shown in the photo. Remove the covering film over the area where the horn is to
be fitted.
The flap linkage consists of an M2 clevis and an M2 threaded pushrod. Screw the clevis onto the
threaded rod as far as it will go, and connect it to the horn. You can now mark the correct length of the
pushrod. Note that the servo output arm should not be at the normal 90° position, but offset to the rear
(towards the trailing edge) on the output shaft by two splines. Switch on the RC system briefly to
check this. Form a Z-bend in the pushrod at the marked point, preferably using Z-bend pliers, e.g.
Order No. 5732.
Before flying the model the control surface travels must be set up as stated on the last page of these
instructions.
The servo well cover can now be trimmed to size and glued over the servo recess.
The cover can either be glued in place using UHU Alleskleber Kraft or similar, or attached using strips
of tape as shown in the photo.
The next stage is to install the two aileron servos.
Wrap the servos in heat-shrink sleeves as described for the flap servo. Set the servos to neutral from
the transmitter and screw the output arms on them. Install the servos in the outboard wing panels as
shown in the photo.
Drill 3 mm Ø holes for the horns in the ailerons about 9 mm aft of the hinge pivot line. Cut down the
horn spigot to the thickness of the aileron, remove the covering film from the aileron over the horn joint
area, and glue the horns in place.
Assemble the linkages exactly as described for the camber-changing flap. When the servos are at
centre both ailerons should also be at centre / neutral.
Trim the servo well covers to final size and attach them to the wings as already described.
The final step is to apply the decals to the model. Cut out the individual decals as accurately as you
can using a pair of scissors.