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Composite-ARF SuperXtra 330L (3.1m span)
techsupport@composite-arf.com
is not really rock solid. So check your linkages
high rate: 240mm (max.)
and closed-loop cables again and make sure
low rate: 70%
that there is NO slop at all ! On the other hand
these characteristics are also the reason for
best rudder sensitivity at the slowest 3D-
speeds.
Ailerons
Aileron throw for high rate is 90mm (meas-
low rate: 70%
ured at root) both up and down. Use at least
high rate: 240mm (max.)
30% exponential at high rate. For low rate you
RUDDER THROWS
should decrease the throw to the TOP to 50
mm, and the BOTTOM to 60mm. Yes, you're
right - this is a reversed differential due to the
hinge line being in the top skin instead
of on
the centre line. You will have to
high rate: 90mm up
finalise this differential figure during
low rate: 50mm up
flight, as mentioned earlier in this
instruction book. At high rate, for 3D
manoeuvres, this doesn't effect the
rolling too much, so you can maxi-
mize the throws to whatever is
low rate: 60mm down
mechanically possible, even more up
high rate: 90mm down
than down if you wish. You may need
to lengthen the slots in the servo
AILERON THROWS
hatches by 2mm or so at the front to
obtain these high rate throws.
In General
Your Extra has very large control surfaces. This makes it very sensitive and reactive. It is always
possible that these huge control surfaces can flutter at high speeds if the assembly, servo instal-
lation and linkages are not made perfectly, and if a servo gear or output disc/arm strips the flut-
ter will not stop until the plane hits the ground....
So please do yourself a favour, and make sure that you only use the best servos available, and
take the utmost care making your linkages. Check every linkage for slop, and rather reduce the
maximum throw than risking a high speed flutter due to sloppy servo gear or linkages. To pre-
vent this for sure, we recommend reduced control travels (reduced by using shorter servo arms,
not by using electronic settings). Using 2 servos per control surface as described in this manu-
al will never overload or damage high quality servos, even if the maximum travel of each servo
is slightly off. The aileron control surfaces have enough torsion flexibility so that damage to the
servos should not occur.
The Composite-ARF TOC 3-Metre Version of the Extra 330S is known for very good and crisp
'snapping', and we think that the 3.1m 'SuperXtra' snaps even better. It's like an explosion ... and
it still stops immediately that the sticks are released. Be aware of this fact when you try it for the
first time. The trick for nice crisp 'snaps' is to stall the plane with a quick hit of 'up' elevator, and
then release the elevator to zero, while you give full rudder and aileron together. But of course,
you know this needs some practice to make it perfect every time !
Perfect knife edge tracking is achieved by mixing in slight up elevator and opposite aileron to the
rudder movement. From our experience as little as 4 - 5% 'up' elevator and 1 or 2% of opposite
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