Composite-ARF SPARK Instruction Manual page 24

Composite-ARF SPARK
arm on the right side. File only a very small 'flat'
for the set screws in the wheel collars (in the
trunion block and steering arm) to grip onto, oth-
erwise you will weaken the wire leg. Make sure
that the plastic bracket slides up and down the
steering arm smoothly.
Install the retract onto the bulkhead. Fit the wing
onto the fuselage, with the main gear extended,
and set the plane on a level surface to set the
length of the nose gear leg. It is preferable to
have a little positive angle (+0.5 - 1 degree) on
the wing root, especially if flying from grass
strips, and we suggest that you make the nose-
leg 4 - 5mm longer than the length required for
0 degree wing incidence.
We also recommend that you bend the noseleg
back a little, at about a 5 degree angle, at about
35mm (1.5") above the axle position. This not
only improves the steering, but also makes sure
that larger wheels retract completely into the
fuselage.
If using plastic wheels, then bend the wire leg to
form the axle for the wheel in the usual way.
If you are fitting the optional Behotec wheels,
then secure the axle to the leg and solder it on
as described in the wing section. There are 2
very short Ø 6mm aluminum tube spacers in the
set that must be fitted on either side of the wheel
hub to centre it on the axle.
The steering servo installation is described at
the end of this section, as it must be installed
after the battery support bulkhead is completed.
techsupport@composite-arf.com
(above) Spring-Air 301 'firewall' retract bolted
to the 6mm ply factory-installed bulkhead
with the M3 allen bolts and T-nuts.
(below) Bend the nose leg back about 5 -
7mm, starting just above the wheel, for
improved ground handling.
5 - 7mm
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