Mark the position of the aileron horns, exactly in line
with the servo arms, and drill and tap the holes M3 for
the threaded rods - in the same way as for the elevator
horns. The centre of the holes should be 9 - 10mm back
from the front edge of the aileron. Fit the horns, glue
into position thru' the end of the aileron with epoxy, and
make up the linkages with your chosen hardware.
The ailerons only need small throws of 10mm 'up’ and
8mm 'down', so the clevise on the servo arm should be
on the 1st or 2nd hole out from the centre, and it will be
hidden inside the wing. Set the travel in your transmit-
ter to 125%, or maximum, and adjust the position of the
plastic adapter on the aileron horns to just give the re-
quired throws. Cut the small slots in the hatches for the
linkages to exit as shown.
The flap linkages require some
patience to install and set up,
but result in a very nice linkage
that is completely hidden within
the wing. Apply masking tape to
the underside of the wing in line
with the flap servo arm, and
draw an accurate line on it to
represent the line of the link-
age,
exactly
perpendicular the
the flap leading edge. File a slot
in the trailing edge of the wing
6mm wide and 10mm deep,
against the upper surface of the
wing, centred on this line. Care-
fully sand away the foam sand-
wich at the top of the slot,
leaving only the thin fibreglass
outer skin at the top of the slot
(see photo on page 13). File a
1mm wide slot in the leading
edge of the flap, the full depth
of the balsa spar, exactly in line with the centre of the slot in the wing trailing edge for the flap
horn. Take both the supplied fibreglass flap horns, lay them exactly on top of each other (sand them
to make the shapes identical if needed) and drill a Ø 1.6mm hole through the front for the clevise
pins, in the position shown in the photos. Keep the hole at least 3mm from the edge of the horns.
We strongly recommend that you fit and glue into place 1 flap horn at a time, and complete the link-
age and check operation with your Transmitter before gluing the 2nd one into position. This gives
you the best chance of positioning both flap horns the same, to obtain similar flap throws.
Scuff up the part of one horn that will be glued into the flap, with the curved part towards the
top
surface of the wing, and trial fit it in the slot. Adjust the slot and horn position as necessary so that
the flap will close and open smoothly, without the horn touching the underside of the wing skin.
Make up the flap linkage now, and connect the servo so that you can test the flap operation be-
Fox Composites Co., Ltd.
12
Completed flap servo and linkage, with flap shown in ‘land-
ing’ position at about 45 degrees deflection.
(below) You can either cut the unused
mounting tabs off the servo case, or
file slots in the plywood mounts to
take them, as shown here (left wing)
