-
Are all tubes and wires protected from chafing where they pass thru’ the holes in fibre
glass parts or bulkheads with rubber grommets, or short lengths of split silicone tubing?
-
Especially if you have installed the internal mini-pipe set-up, you also must make sure
that no fuel tubing or wires can come into contact the exhausts. Use the plastic spiral-
wrap to tidy up groups of cables and make sure that they cannot move around in the
plane under high ’G’ manoeuvres by fixing them to the sides with small cable ties. If using
the easily-available cable-tie plastic fixing plates, please do not trust the double-sided
tape that they usually have on them which can fail under vibrations. Peel it off, rough up
the back face with coarse sandpaper and glue to the fuselage sides with 30min. epoxy.
-
Did you fit small Tygon or silicone tube pieces over all the clevises?
-
Did you tighten the M3 locknuts against all the clevises to make sure they cannot turn?
-
Are the swages crimped up nice and tight on the rudder cables?
-
For added security add one small drop of loctite/thread locking compound on all the bolts
that hold the servo arms to the servos, especially important with digital types.
Then you can go on set up all the linkages, control throws and R/C system as described below.
Setting Up Your Aircraft
Centre of Gravity:
Set the Centre of Gravity to 90 - 100mm (3.3
- 4”) from the leading edge at the wingtip for
the 1st flights. Hold it with a helper at both
wing tips in this position and make sure the
plane balances horizontally. This is the ‘pat-
tern’ CG position.
After you are confident with the plane, you
can move it backwards by up to 20mm (7/8”)
maximum, but this is definitely a ‘3D -
Freestyle’ CG setting and should not be used
for the first flights. With this rearward CG you
will need to use the high rate control throws
shown below.
Don’t forget to balance the plane laterally,
holding the spinner central bolt and a fingertip
under the rudder and, if necessary, add a
small weight to the light wing tip to make it
track correctly.
Composite-ARF Extra 300SX
(2.6m span)
34
C of G range:
90 -100 mm
from Leading Edge at Wing Tip.
CENTRE of GRAVITY
90-100mm