©2012 Toni Clark practical scale GmbH Zeiss-Str.10 D-32312 Lübbecke Tel. 0049 5741/5035 Fax. 05741/40338 www.toni-clark.com
Instructions Titan ZG 45PCI-HV
24
Very important:
Although the microprocessor ignition unit is perfectly screened, please make a range
test with full throttle before the first flight. Use a small propeller to simulate the rpm
when the model is in the air. The range difference with the engine shut off and running
at full throttle should be minimal.
If you have a PCM-radio, use the fail-safe and programme it so that in the event
of interference the engine will be throttled to a reliable tickover. If you can pro-
gramme the time lapse, then make this half a second.
By the way, it is technically impossible to shut off the fail-safe with a PCM-radio, it is
an integral component of the PCM-system, that cannot be removed. Should the fail-
safe be activated by interference or a loss of range, you have several pre-program-
mable options. This means you can programme the radio as to what will happen, for
example the length of time elapse, usually from 0,25 up to 1 second, during which
the servos will stay in the last correctly received position before they move to your
programmed „fail-safe position“. With fail-safe on or off, you get full control again in
the moment the receiver gets a good signal. With the fail-safe „shut off“ the servos
stay at the last correctly received positions and will stay there until either the model
crashes or the receiver once more has a satisfactory signal from your Tx. With fail-safe
in and the engine throttled by the fail-safe, the signal will often get better and you
have a reasonable chance. Also you usually have some prior warning when something
is not quite right.
Imagine when your model is taking off, someone switches on his Tx on your frequency.
Your model is heading in the direction of bystanders at full power. You would be greatly
relieved if your PCM-radio immediately switches the engine to idle. Or?
If you use a metal pushrod for your throttle, you must insulate this metal pushrod from
the engine with a nylon ball joint.
I can advise you strongly, to fly only with a double battery pack. Experience has taught
me that this is something never to fly without. The double battery pack I use is with
two separate plugs, two separate switches and the batteries separated with diodes.
You can use a servo socket for the second switch harness.
Install the receiver, battery and servos as far away as possible from the engine
and particularly from the microprocessor ignition unit;
in certain cases the inter-
ference comes not through the aerial, but through the wiring from the batteries or the
servos. A double superhet will not help!!! Most cases of interference are not caused by
the ignition, but through metal to metal generated noise or from a servo pot wiper
that has suddenly become faulty.
In many radio instructions it states, that one should lay the aerial in a straight line. This
is only OK when the Rx aerial is parallel to the Tx aerial and not pointing directly to
the Tx as is mainly the case in take off and landing. When the Rx aerial points directly
at the Tx this causes the reception to drop to its lowest value. The answer is simple:
lay the aerial straight in the fuselage but bend up the last 25 cm to form a right angle
and fix the aerial in this position securely. You can of course have this 25 centimetre
vertical element straight out of the Rx case and the rest laid flat along the fuselage.
