QuickWorldWide Big Bertha 69, Инструкция по эксплуатации

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Motors are often very hot after operation. So be careful when handling or
touching them immediately after flying.
ADJUSTMENTS
Tracking Adjustment: The tips of the main rotor blades should follow the same
path when they rotate. We call the main rotor blades are in track.
(a) Rev up the motor until the helicopter becomes light on its landing gear.
Raise throttle
gently and
gradually
(b) If the main rotor blades are in track, it’s good.
(c) If the blades are out of track, then adjust one of the pushrods that connect to the
main rotor blade pitch arm.
Out of track
Repeat steps (a) to (c) until the blades are in track.
Trimming:
Most of new built helicopters are unstable. But if you trim your helicopter
properly, you will stop it from drifting away or yawing by itself quickly . Followings are
instructions for trimming your helicopter.
(a) If the helicopter nose starts to
yaw left or right, adjust the tail rotor push rod to
compensate. If using a Heading Hold Gyro, do not adjust the trim lever on the radio.
(b) If the helicopter rolls to left or right, then:
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