Carf-Models EXTRA 330SC Building Instruction page 8

EXTRA 330SC 2.3m
Wings
There is very little construction required to
complete the wings. The ailerons are live hinged,
with the twin control horns factory installed. All
fixings are complete for the wing alignment and
retention system. The two aluminium dowels have
6mm threads that accept our tried and tested
nylon nut. Assembly at the field could not be
quicker. The wings are factory test fitted, and
rigged, all that is required is installation of the
servo and linkage. Before working on the wings it is
a good idea to test fit them to the fuselage. The
root rib is purposely recessed back from the root
wing skin, this allows a small amount of the wing
skin edges to be sanded, should the fit have
changed on the fuselage during transport.
The single aileron servo is fitted to the
ply/composite servo hatch. It is very important you
achieve a strong bond between the servo mounting
frame and servo cover. Sand the glass finish with
120-180 grit paper, until a matt finish is seen.
Assemble the three part servo mounting frame
from the CNC cut parts provided. A stronger bond
will result if you sand the flat surfaces before
cutting loose the servo frame parts, as the plywood
may have a fine coating from the manufacturing
process. We assemble the frame with SLO-ZAP,
before strengthening with epoxy.
Use a straight edge and take a line from between
the double control horn to check the pushrod line
through to the servo arm slot in the hatch.
Assemble and centre your chosen servo with 1 ½"
arm fitted, before this step. We used JR Propo
38mm (1 ½") clamp arms. The arm requires drilling
3mm to accept the Aluminium clevis pin. Care
should be taken to ensure the hole is drilled square
to the arm, the hole also needs to be no larger than
3mm to ensure minimal free play.
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