Check The Control Throws; Balance The Model (C.g.) - GREAT PLANES SYNCRO Instruction Manual

Check the Control Throws

You were also already guided how to connect the pushrods
to get the recommended throws, but because the control
throw has such a great effect on how a model fl ies the throws
should be checked again. You should also program the low-
rate throws so you can switch between rates in-fl ight to suit
your taste and the conditions.
It is best to get the throws as close as possible to the
recommended measurements specifi ed below fi rst by
relocating the pushrods on the servo arms and/or on the
control horns on the control surfaces. Once the throws are
close, then you can adjust the end points or ATV's in your
transmitter as necessary. Moving the pushrods inward on
the servos or outward on the control surfaces will provide
less throw. Moving the pushrods outward on the servos or
inward on the control surfaces will provide more throw.
These are the recommended control surface throws:
HIGH RATE
Up
3/8"
ELEVATOR
[10mm]
17°
Right
5/8"
RUDDER
[16mm]
22°
Up
AILERONS
3/8"
(Glider Wing)
[10mm]
18°
Up
AILERONS
5/16"
(Sport Wing)
[8mm]
13°
Note that the aileron throws for the glider wing and the
sport wing are different, but all the rest of the throws are
the same for both models.
LOW RATE
Down Up Down
3/8" 1/4" 1/4"
[10mm] [6.5mm] [6.5mm]
17° 11° 11°
Left Right Left
5/8" 3/8" 3/8"
[16mm] [10mm] [10mm]
22° 13° 13°
Down Up Down
3/8" 1/4" 1/4"
[10mm] [6.5mm] [6.5mm]
18° 12° 12°
Down Up Down
5/16" 3/16" 3/16"
[8mm] [5mm] [5mm]
13° 8°

Balance the Model (C.G.)

The C.G. (Center of Gravity) is the location on the wing
where the model balances. Same as the control throws,
the C.G. has a profound effect on the way the model fl ies.
If the C.G. is too far aft (tail heavy), the model will be too
responsive. If the C.G. is too far forward (nose-heavy), the
model will not be responsive enough. Follow the balance
procedure to make sure the model is properly balanced
and the C.G. is in the correct location.
IMPORTANT! If balancing your Syncro with the Sport
wing, it will have to be re balanced again if you install the
Glider wing. And the same is true for the opposite—be
certain to re balance your Syncro after switching wings.
❏
1. On page 10 you were already instructed to mark the
balance lines on the bottom of the wings. Mount the wing
and Install the motor battery. All the rest of the parts of the
model should be installed including the fan duct with the
motor, landing gear, battery hatch and all the servos and
radio components.
❏
2. Place your fi ngers on the middle balance lines and
lift the model. If the fuselage remains level (balances), your
Syncro is perfectly balanced—it may be helpful to have an
assistant view the model from the side if you can't tell for sure.
If the fuselage does not rest level try moving your fi ngers
8°
under the wing, making certain to keep them between the
forward and aft lines. If you can get the fuselage to rest
level with your fi ngers between the forward and aft balance
lines, it is within the recommended balance range and could
be fl own, but it's really best to get the model to balance
directly on the middle lines as recommended. This is where
the Syncro will fl y best. Balance the model as instructed in
the following steps.
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