Great Planes Extra 300SP EP ARF - GPMA1188 - Manual (Page 18)

18
Up & Down
These are the recommended control surface throws:
3/8"
[10 mm]
7°
1-1/4"
[32 mm]
12°
3/8"
[16 mm]
9°
ELEVATOR
AILERON
LOW
RUDDER
Up & Down
Right & Left
Up & Down
5/8"
[16 mm]
11°
1-7/8"
[ 48 mm]
18°
5/8"
[16 mm]
14°
HIGH
Up & Down
Right & Left
Up & Down
2"
[ 51mm]
38°
3-1/2"
[ 89 mm]
35°
1"
[ 25 mm]
24°
3D
Up & Down
Right & Left
We also put exponential into the high rates and the 3D rates to
make the control throws less sensitive around neutral. These
can be set up to your own preference and fl ying style. For our
Futaba radio system we put - 20% to -30% in the high rate
and -50% to - 60% in the 3D rates.
IMPORTANT: The Extra 300SP EP has been extensively
fl own and tested to arrive at the throws at which it fl ies best.
Flying your model at these throws will provide you with the
greatest chance for successful fi rst fl ights. If, after you have
become accustomed to the way the Extra 300SP EP fl ies,
you would like to change the throws to suit your taste, that is
fi ne. However, too much control throw could make the model
diffi cult to control, so remember, “more is not always better.”
Finish the Model
❏
1. Install the spinner back plate, propeller with washer and
prop nut and the spinner cone. Secure the spinner cone to the
back plate with two 3  10 mm sheet metal screws.
❏
2. Insert a fl ight battery in the fuselage and use the hook
and loop material to hold the battery in position. Do not connect
the battery to the ESC while balancing the model.
❏
3. If you wish to install a pilot do so now. We used
the Williams Brothers 1/4 Pilot Bust Kit Sportsman pilot
(WBRQ1160).
❏
4. Install the canopy/hatch.
Balance the Model (C.G.)
More than any other factor, the C.G. (balance point) can
have the greatest effect on how a model fl ies, and may
determine whether or not your fi rst fl ight will be successful.
If you value this model and wish to enjoy it for many fl ights,
DO NOT OVERLOOK THIS IMPORTANT PROCEDURE.
A model that is not properly balanced will be unstable and
possibly unfl yable.
At this stage the model should be in ready-to-fl y condition with
all of the systems in place including the motor and battery,
landing gear, covering and paint, and the radio system.
❏
1. Use a felt-tip pen or 1/8" [ 3 mm]- wide tape to accurately
mark the C.G. on the top of the wing at the side of the fuselage.
The C.G. is located 3" [ 76 mm] back from the leading edge of
the wing at the side of the fuselage.
This is where your model should balance for the fi rst fl ights.
Later, you may wish to experiment by shifting the C.G. up
to 3/16" [ 5mm] forward or 5/8" [16 mm] back to change
the fl ying 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 diffi cult
to slow for landing. Moving the C.G. aft makes the model
more maneuverable, but could also cause it to become too
diffi cult to control. In any case, start at the recommended
balance point and do not at any time balance the model
outside the specifi ed range.