Engine Thrustline:
Already given in the instructions, down thrust should initial-
ly be set at 0° degrees and right thrust 2.5 - 3 degrees,
depending on the prop used. We recommend a 27 x 10 on
a 75 - 80cc motor, and a 28 x10 carbon prop for any 100cc
engine. It is a very quiet and powerful solution. They are
normally CNC-designed, so the prop is balanced perfectly
statically, dynamically and aerodynamically, which keeps
the vibration down to a minimum.
Control Throws:
All measurements are at the root/trailing edge position.
All controls should be set with a dual rate
switch.
Elevator
On high rate the elevator should really be at
maximum, up to 50 degrees both sides
(approx. 100mm), but in this case with 50%
exponential. Low rate should be no more than
50mm (2") both sides. This is the perfect
throw for nice and crisp snaps. If you like you
can add about 20% exponential to the low rate
setting as well.
Rudder
Set the high rate to maximum throw (about
150mm) both sides, and at low rate reduced
to about 100mm. The Extra needs quite a lot
of rudder for nice stall turns, so you should at
least add 25% exponential for smooth track-
ing corrections. At the same time you should
remember that the Extra rudder is very sensi-
tive, and the plane starts shaking at high
speed if the rudder linkage is not really rock
solid. So check your linkages and closed-loop
cables again and make sure that there is NO
slop at all ! On the other hand these charac-
teristics are also the reason for best rudder
sensitivity at the slowest 3D-speeds.
Ailerons
Aileron throw for high rate is 65mm up
and down (measured at root). Use at
least 30% exponential at high rate.
For low rate you should decrease the
throw to the TOP to 45mm, to the
BOTTOM to 50mm. 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 finalise this differential figure
Composite-ARF Extra 300SX
(2.6m span)
35
2.5 - 3° depending on propeller
SIDETHRUST
ELEVATOR THROWS
high rate: 100mm (max.)
low rate: 50mm
low rate: 50mm
high rate: 100mm (max.)
RUDDER THROWS
high rate: 150mm (max.)
low rate: 100mm
low rate: 100mm
high rate: 150mm (max.)
AILERON THROWS
low rate: 50mm down
high rate: 65mm (max.)
high rate: 65mm up (max.)
low rate: 45mm up
