Great Planes Extra 300S 1.60 ARF - GPMA1365 - Manual (Page 19)

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3. Make certain that the control surfaces and the carburetor
respond in the correct direction as shown in the diagram. If any
of the controls respond in the wrong direction, use the servo
reversing in the transmitter to reverse the servos connected to
those controls. Be certain the control surfaces have remained
centered. Adjust if necessary.
Use a Great Planes AccuThrow (or a ruler) to accurately
measure and set the control throw of each control surface
as indicated in the chart that follows. If your radio does not
have dual rates, we recommend setting the throws at the
low rate setting.
NOTE: The throws are measured at the widest part of the
elevators, rudder and ailerons.
At this stage the model should be in ready-to-fly condition
with all of the systems in place including the engine,
landing gear, covering and paint, and the radio system.
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1. Use a felt-tip pen or 1/8"-wide tape to accurately mark
the C.G. on the bottom of the wing on both sides of the
fuselage. The C.G. is located 5-1/2" [140mm] back from the
leading edge of the wing.
This is where your model should balance for the first
flights. Later, you may wish to experiment by shifting the
C.G. up to 3/4" [19mm] forward or 1/2" [13mm] back to
change the flying characteristics. Moving the C.G.
forward may improve the smoothness and stability, but
the model may then require more speed for takeoff and
make it more difficult to slow for landing. Moving the
C.G. aft makes the model more maneuverable, but
could also cause it to become too difficult to control. In
any case, start at the recommended balance point
and do not at any time balance the model outside the
specified range.
More than any other factor, the C.G. (balance point) can
have the greatest effect on how a model flies, and may
determine whether or not your first flight will be successful.
If you value this model and wish to enjoy it for many flights,
DO NOT OVERLOOK THIS IMPORTANT PROCEDURE.
A model that is not properly balanced will be unstable and
possibly unflyable.
Balance the Model (C.G.)
IMPORTANT: The Extra 300S 1.60 ARF has been
extensively flown and tested to arrive at the throws at
which it flies best. Flying your model at these throws will
provide you with the greatest chance for successful first
flights. If, after you have become accustomed to the way
the Extra 300S flies, you would like to change the
throws to suit your taste, that is fine. However, too much
control throw could make the model difficult to control,
so remember, “more is not always better.”
These are the recommended control surface throws:
High Rate Low Rate
ELEVATOR: 1/2" up [12.7mm] 3/8" up [9.5mm]
1/2" down [12.7mm] 3/8" down [9.5mm]
RUDDER: 4" right [102mm] 2-1/2" right [64mm]
4" left [102mm] 2-1/2" left [64mm]
AILERONS: 1" up [25.4mm] 5/8" up [15.9mm]
1" down [25.4mm] 5/8" down [15.9mm]
Set the Control Throws
4-CHANNEL
TRANSMITTER
TRANSMITTER
4-CHANNEL
TRANSMITTER
4-CHANNEL
TRANSMITTER
4-CHANNEL
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