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Composite-ARF Extra 330L (2 x 2m)
techsupport@composite-arf.com
Wings
The wings are 95% finished at the factory, and
have already been installed on your fuselage to
check alignment. They fit on a 30mm Ø alumini-
um alloy spar tube, with 6mm Ø glass rod anti-
rotation pins at the front and back.
Each wing is secured to the fuselage with an M6
plastic bolt (glued into the wing root) and a
large plastic nut. The fibreglass spar sleeve and
carbon-ply reinforcing plates have also been
installed in the fuselage at the factory, and the
positions of the holes for the anti-rotation pins is
set in the mould to ensure correct alignment.
Drill 6mmØ thru' the 4 positions for the anti-rota-
tion pins and also for 2 wing retaining bolts.
Slide the wings on, temporarily insert the four
50mm lengths of 6mm glass rod, and check for
a perfect fit between the root and fuselage. You
can sand the edges of the wing roots a little if
needed by protecting the fuselage with masking
tape and using 240 grit sandpaper (see photo)
Wax the outside surface of the fuselage around
the wing root area, and sand the fuselage inside
where the anti-rotation pins will stick thru'.
Lightly sand the around the heads of the two M6
plastic bolts and insert them into the holes in the
root ribs so that the threaded part projects as
shown. Do not glue in place yet.
Rough up about 25mm of end of each of the 6mmØ glass
anti-rotation rods and glue them into the holes in the wing
roots with a thick 30 min epoxy/micro-balloon mix. At the
same time apply a little epoxy mix around the heads of the
plastic bolts to secure. Quickly push the wings into position
on the spar tube, making sure that the glass rods project
inside the fuselage about 10 - 12mm, and tighten the plas-
tic nuts on the plastic bolts. It's helpful to have a 2nd per-
son to help with this. After about an hour you can remove
the wings. Check the glue joints around the 6mmØ anti-
rotation pins carefully - these are important glue joints !
Wax the exposed anti-rotation pins and re-fit the wings. Glue the 4 milled plywood washers (car-
bon shown in these photos) onto the inside of the fuselage to retain each pin, using a
epoxy/micro-balloons mix.
Cut two small sub-ribs from 3mm scrap balsa and glue in the wing on the inner side of each
servo cutout to stiffen the wing here using epoxy/microballoon mix (see photos). Glue the phe-
nolic aileron horns into the milled slots in the same way as the elevator horns, making sure that
the clevise holes are perpendicular to the hinge axis. As before, we advise you to fit one horn
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