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Photo 3: Aileron servo mounts.
control horns using an M3 x 16 Allen screw and
nylon stop nut. Fit the clevis in the outer hole of
an 18-20mm radius arm.
Finally fix the servo cover plate to the wing
using four 2.9 x 10mm sheet metal screws.
The flap servos are mounted into the larger
servo mounting frame and installed on the
factory installed mount, accessible through the
main gear opening in the wings lower surface.
The servo is mounted with the servo arm nearest
the wing leading edge and root. Assemble
the frame with thick CA or epoxy, making a
handed pair.
We recommend a servo with minimum 11.0kg
torque as the Tutor flaps are quite large.
C-ARF strongly recommends using the JR
8411/8711 servo for the flaps, (ideally the
8711) fitted with a heavy duty servo arm. The
required flap travel requires a minimum 20mm
Composite ARF Tutor T-114 manual – techsupport@composite-arf.com
radius servo arm to exploit the available travel.
The Dubro high strength arms allow 22-25mm
radius which is ideal for a little more flap
travel. The depth of the wing allows a double
sided arm to be used without trimming the
unused side.
The flap servos are fixed into the frame using
four 2.9 x 13 sheet metal screws-note do not use
the stock servo mounting screws. The frame is
mounted in the wing using three M3 x 10 Allen
screws fitted with a washer. Note the centre
fixing washer may need a flat cutting to clear the
servo case. (Photo 4)
Some time should be spent cleaning up the
factory cut openings in the wing trailing edge
where the flap linkage passes through. Use a file
to remove any material left around the opening.
This will stop any possible binding of the
linkage during flap operation.
7
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