www.seagullmodels.com
23
BALANCING.
1) It is critical that your airplane be balanced
correctly. Improper balance will cause your
plane to lose control and crash. The center of
gravity is located
70mm
back from the lead-
ing edge of the wing, measured at the wing
tip.
2) If the nose of the plane falls, the plane is
nose heavy. To correct this first move the bat-
tery pack further back in the fuselage. If this is
not possible or does not correct it, stick small
amounts of lead weight on the fuselage sides
under the horizontal stabilizer. If the tail of the
plane falls, the plane is tail heavy.
When balanced correctly, the airplane should
sit level or slightly nose down when you lift it
up with your fingers.
To correct this, move the battery and receiver
forward or if this is not possible, stick weight
onto the firewall or use a brass heavy hub spin-
ner hub.
2)
Turn on the radio system, and with the
trim tabs on the transmitter in neutral, center
the control surfaces by making adjustments
to the clevises or adjustable servo connectors.
The servo arms should be centered also.
1)
We highly recommend setting up the
PC-9
using the control throws listed at right.
We have listed control throws for Low Rate
(initial test flying/sport flying) (aerobatic fly-
ing).
CONTROL THROWS.
3) When the elevator, rudder and aileron
control surfaces are centered, use a ruler and
check the amount of the control throw in each
surface.
The control throws should be
measured at the widest point of each sur-
face!
Do not use the aerobatic settings for
initial test flying or sport flying.
Ailerons:
3/16” up 3/16” down
Elevator:
5/16” up
5/16” down
Rudder:
3/4” right 3/4” left
AEROBATIC FLYING
Ailerons:
3/8” up
3/8” down
Elevator:
5/8” up 5/8”down
Rudder:
1-1/4” right 1-1/4” left
Wing bolt.
70mm.
A.
A.
C/A glue.
FLIGHT PREPARATION.
4) By moving the position of the adjust-
able control horn out from the control surface,
you will decrease the amount of throw of that
control surface. Moving the adjustable con-
trol horn toward the control surface will in-
crease the amount of throw.
