Composite-ARF CARF-Models Spitfire Building Instructions page 17

Wing assembly (Servo mounts)
Do not change the order of the
following steps. The flaps and
ailerons are pre-hinges at the factory
and only the servos and control
horns need to be installed to
complete. Let's start with the
assembly of the servo mounts.
Please take care to scuff all mating
areas that will be glued and use only
a fiber reinforced epoxy. Failure of a
glue joint here is not an option. Use
the top photo as a guide to identify
the parts. The lower part (right) will
be assembled and glued to the top of
the wing. The upper part (left) will be
mounted to the lower part using two
3mm screws and blind nuts.
The lower part is made up from two
pre-cut parts and two strips that we
will cut from a piece of 1/8" (3mm) X
1/2" (13mm) plywood. Install the two
blind nuts as shown in the photo.
Glue together the two pre-cut parts
and the two side strips and clamp.
Assemble the upper mount by tack
gluing the parts together with CA and
then applying a bead of epoxy to all
joints as shown.
Wing assembly (control horns)
The control horns will be installed
next as they are used as a guide for
servo installation. Apply masking
tape to the inboard, bottom side of
the aileron Make a line 1"(25mm) in
from the inboard end of the aileron.
From the aft edge of the aileron,
measure up 4 1/8" (105mm). This
will be the forward inside point of the
hole for our control horn. From here measure in 1/8"(3mm) and back 5/8"(16mm).
Use a dremel to mill out the hole using care not to go through the aileron.
Continued
Composite-ARF Spitfire 17