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CARF-Models Extra 330SC (3.1m)
Add
one
small
compound on all the bolts that hold the servo arms to
the servos, especially important with digital types, as
the occasional 'buzzing' you hear is actually high-
frequency vibration which, over some time, can
cause the servo arm securing bolts to work loose. We
have seen this happen several times - so you can
treat it as a fact !
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 G ravity
Set the Centre of Gravity to 100-120mm back from the
leading edge at the wing tips. Hold it with a helper at both
wing tips in this position and make sure the plane balances
horizontally.
Balance the plane laterally also, holding the motor propeller
shaft and a fingertip under the finpost, and if needed add a
small weight to the light wing tip to make it track correctly.
Throws
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. We added only 15% exponential to the
high rate setting in order to provide enough sensitivity during
3D maneuvers. Low rate should be no more than 20 degrees
both sides. This is the perfect throw for nice and crisp snaps.
We added about 55% (Futaba) exponential to the low rate
setting – this may vary a bit, if you use another transmitter
system.
Rudder
Set the high rate to maximum throw (about 43 degrees) both
sides, and at low rate reduced to about 30 degrees. You
should add at least 40% exponential for smooth tracking
corrections. Make sure that your linkages and closed-loop
cables are tight with no slop at all. We added only 15%
exponential to the high rate setting as at the elevator.
Ailerons
Aileron throw for high rate is 150mm (measured at root) both
up and down (make sure the ailerons aren't blocked at full
throw). Use at least 25% exponential at high rate. For low
rate you should decrease the throw to 75mm both sides. If
you like very fast snaps, you can increase the low rate to
drop
of
loctite/thread
25
www.carf-models.com
locking
The Extra with a nice custom-
scheme
Aileron throw for high rate is
150mm
The CARF-tent at an airshow in
Germany
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