Carf-Models Composite-ARF Extra 330L Instruction Manual page 34

Composite-ARF Extra 330L (2 x 2m)
Centre of Gravity:
For the 1st flights set the Centre of Gravity at
90 - 95mm (3.55 - 3.75") from the leading
edge at the wing tip. Hold it with a helper at
both wing tips in this position and make sure
the plane balances horizontally, or slightly
nose-down. This is the 'pattern' CG position.
After you are confident with the plane, you can
move it backwards up to 100mm from the
leading edge at the wing tip, but this definite-
ly 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 spin-
ner central bolt and a fingertip under the rudder, and if need-
ed add a small weight to the light wing tip.
Engine Thrustline:
UPthrust should initially be set at 0.5 - 0.75° degrees and
right thrust 3 - 3.5 degrees, depending on the power system
and propeller used. With the DA-50 and carbon Mejzlik 23 x
8 prop we needed 1° upthrust and 3.5° right thrust, but with
the Hacker 50 and APC E22x12 only about 0.5° upthrust
and 3° sidethrust is required. Of course, final settings can
be fine-tuned to your liking after the first few flights, and will
ultimately depend on your motor/propeller set up.
Control Throws:
All measurements are at the root/trailing edge
position.
Elevator
All controls should be set with a dual rate
switch. On high rate the elevator should really
be at maximum, up to 50 degrees both sides
(approx. 85mm), 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 175mm) both sides, and at low rate reduced to about
120mm. The Extra needs quite a lot of rudder for nice stall turns, so you should at least add 25%
exponential for smooth tracking corrections. At the same time you should remember that the
Setting Up Your Aircraft
techsupport@composite-arf.com
C of G range:
from Leading Edge at Wing Tip.
CENTRE of GRAVITY
3 - 3.5° depending on propeller
ELEVATOR THROWS
34
90 - 95 mm
SIDETHRUST
high rate: 85mm (max.)
low rate: 50mm
low rate: 50mm
high rate: 85mm (max.)