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12. the sYstem in use
Futaba receivers continue to work, with full range, right down
to a power supply voltage of 3 V. The advantage of this cha-
racteristic is that the receiving system does not usually cease
working even if one battery cell fails completely (short-circuit),
since robbe-Futaba servos work right down to 3.6 V - albeit
slightly more slowly, and with reduced power. This can be very
important in Winter when temperatures are low, as brief voltage
collapses can have a serious adverse effect on the radio link
otherwise.
However, there is also a drawback: under certain circumstances
the operator may not even realise that one battery cell has
failed. For this reason we strongly recommend that you monitor
the receiver battery at regular intervals. We particularly recom-
mend the use of the robbe Battery Monitor 8 LED, No. 8409.
12.1 WaterprOOf receiVer installatiOn
When installing the receiving system in a model car or boat, the
receiver should be wrapped in plastic film to prevent water rea-
ching it. However, please note that it is essential to remove the
receiver from the film after use, otherwise condensation might
form inside it.
13. installing the receiVing sYstem
13.1 receiVer
In the course of the years every RC modeller gathers personal
experience, and develops his own preferred methods of instal-
ling and using RC components. 2.4 GHz technology has ushe-
red in a new epoch, and has brought enormous advantages
with it. Nevertheless, we need to bear in mind certain funda-
mental changes relating to 2.4 GHz systems, and learn to install
and use the RC components differently.
One of the most common mistakes with the new equipment is to
continue to wrap the receiver in foam, or place it in a soft foam
tube, in order to protect it from the effects of vibration. This is not
necessary with 2.4 GHz FHSS receivers, as they do not contain
ceramic filters, and are therefore much less vulnerable to vibra-
tion than receivers employing earlier technology.
In fact, this "well-intentioned" measure can be counter-produc-
tive, as 2.4 GHz receivers are fitted with high-performance ICs
which draw fairly high currents, and as a result they can develop
significant heat. If the receiver is wrapped in foam, it is difficult
for the heat to escape from the receiver.
Modellbau Lindinger GmbH
skysport t4Yf 2,4 ghz
For this reason we recommend that you simply fix the 2.4
GHz receiver in place using double-sided foam tape or Velcro
(hook-and-loop) tape.
please note the following points:
• On hot, sunny days do not leave your models in the car,
otherwise they and the electronic equipment will heat up
excessively.
• Provide adequate ventilation, or - even better - take the
model out of the car and place it in the vehicle's shade.
• If your model is fitted with a clear or light-coloured canopy,
the sun will shine through and heat up the fuselage and RC
components in it. You can avoid this by removing the canopy,
thereby ventilating the fuselage; alternatively cover it with a
light-coloured cloth.
• Cover dark-coloured models with a cloth, or park them in the
shade.
• If your model has a slim or black CFRP / GRP fuselage and
contains a receiver, do not leave it in the car or in direct suns-
hine.
• Do not install the receiver close to the motor, engine or
exhaust system, as these parts radiate heat which can cause
the receiver's temperature to rise to an dangerous level.
• Silencers installed inside a fuselage generate a lot of heat,
which can cause excessive temperatures in the fuselage. The
silencer can be separated physically by measures such as a
balsa tunnel or compartment, thereby keeping the rest of the
fuselage cool.
• It is always best to provide a means for air to circulate through
the fuselage.
• If the design does not include such features as standard, cut
ventilation slots in the canopy or fuselage.
General information on 2.4 GHz RC systems
• Large obstacles between the transmitter and receiver may
damp or block the signal.
• When close to the ground, the system's transmitted signal is
damped (reduced) more severely than in the case of 35 MHz
systems. On foggy days and / or when the ground is wet, the
effective radio range close to the ground may be reduced.
• If the model is close to the ground and an obstacle (person,
vehicle, large object, etc.) comes between the transmitter and
receiver, the range may be significantly reduced.
• 2.4 GHz signals are propagated virtually in a straight line, so
it is always essential to maintain visual contact with the model.
e-Mail: [email protected]
13.2 serVO installatiOn
When installing servos, always use the rubber grommets and
brass eyelets supplied in the accessory packs. When you fit the
servo retaining screws, ensure that they are not tightened bey-
ond the point where the brass eyelets make contact top and
bottom; if they are compressed too far, the ability of the rubber
grommets to absorb vibration is reduced or lost.
The diagram below shows two typical methods of mounting ser-
vos.
Diagram "A" shows a wooden servo plate; diagram "B" shows
the use of a plastic or aluminium plate.
In RC model cars the servos are usually fitted in the openings
provided for them in the RC installation plate.
1
2
3
4
5
1 Woodscrew
2 Washer
3 Rubber grommet
4 Metal eyelet
5 Wood
13.3 servo travels / servo output levers
Each servo must be able to move through its full arc of travel
without being mechanically obstructed by the control surface or
its linkage. This applies in particular to the carburettor linkage.
The 'full throttle' and 'idle' settings must be determined by the
stick positions; never by the throttle barrel's mechanical end-
stop. If you ignore this warning, the servo motor will constantly
be under almost full load, and will consume an extremely high
current.
www.lindinger.at
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