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10X MANUAL Heli
• Do not lubricate servo gears or motors.
• Do not overload retract servos during retracted or extended con-
ditions. Make sure they are allowed to travel their full deflection.
• Make sure that all servos move freely through their rotations
and that no linkages hang-up or bind. A binding control linkage
can cause a servo to draw excessive current. A stalled servo can
drain a battery pack in a matter of minutes.
• Correct any control surface “buzz” or “flutter” as soon as it is
noticed in flight, as this condition can destroy the feedback
potentiometer in the servo. It may be extremely dangerous to
ignore such “buzz” or “flutter.”
Note: Coreless servos (all servos in the thousand series from
JR, e.g., DS8231, 4721, 4131, etc., are coreless) make a slight
buzzing noise even at the center position. This is normal and is
caused by the motor constantly locking on its center position.
• Use the supplied rubber grommets and brass servo eyelets
when mounting your servos. Do not overtighten the servo
mounting screws as this negates the dampening effect of the
rubber grommets.
• Ensure that the servo horn is securely fastened to the servo.
Use only the
JR
servo arm screws provided — the thread size is
different from that used by other manufacturers.
• Do not continue to use the servo arms when they become “yel-
lowed” or discolored. Such servos arms may be brittle and snap
at any time, possibly causing the helicopter to crash.
• Check all related mounting screws and linkages frequently.
Helicopters often vibrate. These vibrations may loosen the link-
ages and/or screws.
Radio controlled models are a great source of pleasure.
Unfortunately, they can also pose a potential hazard if not main-
tained and operated properly. It is imperative that you install your
radio control system correctly. Additionally, your level of pilot-
ing competency must be high enough to ensure that you are able
to control your aircraft under all conditions. If you are a new-
comer to radio control flying, please seek help from an experi-
enced pilot or your local hobby shop.
Listed below are some safety precautions that must be
followed by all pilots:
• Ensure that your batteries have been properly charged prior
to initial flight.
• Keep track of the time that the system is turned on so that you
will have an idea of how long you can safely operate your system.
• Perform a range check prior to the initial flight of the day. See
Section 13, Daily Flight Checks, for information on how to do so.
• Check all control surfaces prior to each take off.
• Use frequency flags.
• Do not fly your model near spectators, parking areas, or at
any other place that could result in injury to people or damage
to property.
• Do not fly during adverse weather conditions. Poor visibility
can cause disorientation and loss of control of your aircraft.
Strong winds can cause similar problems.
• Do not fly unless your frequency is clear.
Warning: Only one transmitter at a time can operate on a
given frequency. If you should turn on your transmitter while
someone else is operating a model on your frequency, both pilots
will lose control of their models. Only one person can use a
given frequency at a time.
It does not matter if it is
AM, FM or PCM — only one frequency
at a time.
• Do not point the transmitter antenna directly toward the
model. The radiation pattern from the tip of the antenna is
inherently low.
• Do not take chances. If at any time during flight you observe
any erratic or abnormal operation, land immediately and do not
resume flight until the cause of the problem has been ascertained
and corrected.
Remember: Safety can never be taken lightly.
General Notes
11
Servo Precautions
10
