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5
months – and check that they still have adequate ca-
pacity for their purpose.
Use only genuine GRAUPNER rechargeable batte-
ries!
Suppressing electric motors
All conventional electric motors produce sparks bet-
ween commutator and brushes, to a greater or lesser
extent depending on the motor type; the sparking ge-
nerates serious interference to the radio control sys-
tem.
In electric-powered models every motor must there-
fore be effectively suppressed. Suppressor fi lters re-
liably eliminate such interference, and should always
be fi tted.
Read the information in the Operating Instructions
and Installation Instructions supplied with your elec-
tric motors for more information on this subject.
Refer to the main GRAUPNER FS catalogue for de-
tails of suppressor fi lters.
Servo suppressor fi lters for extension leads
Order No. 1040
Servo suppressor fi lters are required if you are obli-
ged to use long servo extension leads, as they elimi-
nate the danger of de-tuning the receiver. The fi lter is
connected directly to the receiver input. In very diffi -
cult cases a second fi lter can be used, positioned clo-
se to the servo.
Using electronic speed controllers
Electronic speed controllers must be chosen to suit
the size of electric motor which they are required to
control.
There is always a danger of overloading and possib-
ly damaging the speed controller, but you can avo-
id this by ensuring that the controller’s current-hand-
ling capacity is at least half of the motor’s maximum
stall current.
Particular care is called for if you are using a “hot” (i.e.
upgrade) motor, as any low-turn motor (small number
of turns on the winding) can draw many times its no-
minal current when stalled, and the high current will
then wreck the speed controller.
Electrical ignition systems
Ignition systems for internal combustion engines can
also produce interference which has an adverse ef-
fect on the working of the radio control system.
Electrical ignition systems should always be powered
by a separate battery – not the receiver battery.
Be sure to use effectively suppressed spark plugs
and plug caps, and shielded ignition leads.
Keep the receiving system an adequate distance
away from the ignition system.
Static charges
Lightning causes magnetic shock waves which can
interfere with the operation of a radio control transmit-
ter even if the thunderstorm actually occurs several
kilometres away. For this reason ...
... always cease fl ying operations immediately if
you notice an electrical storm approaching. Static
charges through the transmitter aerial can be life-
threatening!
Caution:
Radio control systems may only be operated on the
frequency bands and spot frequencies approved in
each EU country. You will fi nd information on frequen-
cies in the section “Approved operating frequencies”
on page 168. It is prohibited to operate radio control
systems on any other frequency, and the authorities
are entitled to take appropriate legal action in such
cases.
Care and maintenance
Don’t use cleaning agents, petrol, water or other sol-
vents to clean this equipment. If the case, the whip
aerial etc. gets dirty, wipe them clean with a soft dry
cloth.
Components and accessories
As manufacturers, the company of GRAUPNER
GmbH & Co. KG recommends the exclusive use of
components and accessories which have been tes-
ted by GRAUPNER and approved for their capability,
function and safety. If you observe this rule, GRAUP-
NER accepts responsibility for the product.
GRAUPNER cannot accept liability for non-appro-
ved parts or accessories made by other manufac-
turers. It is not possible for GRAUPNER to assess
every individual item manufactured by other pro-
ducers, so we are unable to state whether such
parts can be used without incurring a safety risk.
Liability exclusion / Compensation
We at GRAUPNER are unable to ensure that you ob-
serve the operating instructions, and are not in a po-
sition to infl uence the way you install, operate and
maintain the radio control system components. For
this reason we are obliged to refute all liability for
loss, damage or costs which are incurred due to the
incompetent or incorrect use and operation of our
products, or which are connected with such operati-
on in any way.
Unless otherwise prescribed by law, the obligation of
the GRAUPNER company to pay compensation is li-
mited to the invoice value of that quantity of GRAUP-
NER products which was immediately and directly in-
volved in the event in which the damage occurred.
This does not apply if GRAUPNER is found to be sub-
ject to unlimited liability according to binding legal re-
gulation on account of deliberate or gross negligence.
Safety notes
5


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