Composite-ARF SPARK Instruction Manual page 21

Composite-ARF SPARK
axles. Retract the legs to check for the exact
position that the axles need to be secured to the
legs, and then tighten the set screws in the ends
of the axles.
Remove the legs from the retract units and also
the wheels and brake units. Now solder the
axles in position using quality soft solder and
non-acid flux; even better is a low-temperature
silver solder that can be used with an electrical
soldering iron (eg: Stay-Brite).
Fit the brakes with the nipples to the rear of the
wheels, tape the air tube to the wire legs, and
run it through the coil in the wire leg at the bot-
tom so that it cannot get 'kinked' during retract
operation. You can use some small scraps of the
5 x 5mm balsa strip to secure the retract tubing
inside the wheel wells, to make sure it cannot
get caught during operation.
When finally installing the main legs and wheels,
set a little bit of 'toe-in' on both, about 1 degree
or so, for best ground tracking and handling.
Servo and retracts
covers are made in
same way as for the
stab; cut them from
the thin painted fibre-
glass sheet included,
and tape them onto
the wing using clear
tape (eg: TESA)
Collect the extension
cables from the
aileron and speed-
brake servos with the
retract/brake air lines,
and route them thru' a
plastic grommet
glued into a hole on
the center-section of
the wing.
They all need to extend into the fuselage for 125 - 150mm (5 - 6") and can be bundled together
in a length of 'spiral-wrap' to make it easier to pass them into the fuselage area when assem-
bling the plane at the field.
techsupport@composite-arf.com
(above) Order of assembly of Behotec wheels
and brakes. Don't forget the spacer tubes!
(below) Ø 6mm steel axles are bolted on,
and then soldered to the Ø 4mm wire legs
21