User's Manual

78
Program description: transmitter control settings – model helicopter
Important:
In contrast to servo travel adjustments, changing the
transmitter travel setting affects all mixer and coupling
inputs derived from it, i. e. in the fi nal analysis all the
servos which can be operated using the associated
transmitter control.
“Throttle”
+
+100%
+100%
+100%
+100%
+100%
+100%
trv
free
ctrl 8
ctrl 7
thr
gyr
lim
In principle all transmitter controls (rotary proportional
knob) and s
witches present on the transmitter can be
assigned to the individual inputs within the Helicopter
program.
However, please note that all inputs available in this
menu are already pre-defi ned for helicopter-specifi c
functions, and for this reason cannot always be used
without restriction.
For example, the receiver sequence printed on page 47
shows that the throttle servo (or the speed controller of
an electric-powered model helicopter) must be con-
nected to receiver output “6”, i. e. control channel “6” is
reserved for motor speed control.
However, in contrast to a fi xed-wing aircraft, the throt-
tle servo or speed controller is not directly controlled
by the throttle stick or any other transmitter control, but
via a complex mixer system - see “Helicopter mixers”
menu, starting on page 94. The “throttle limit function”
(described on the next page) also has an infl uence on
this mixer system.
Assigning a transmitter control or switch in the “Throt-
tle” line, or its supplementary control signal, would only
unnecessarily “confuse” this complex mixer system.
For this reason the “Throttle” input MUST always
be left “free” when you are programming a model
helicopter.
„Gyr“
+
trv
thr
gyr
lim
+100%
+100%
+100%
+100%
+100%
+100%
free
ctrl 7
free
If the gyro you are using features infi nitely variable gain
control, then y
ou can pre-set the static gyro effect by
setting an “offset” within the range +/-125%, separately
for each fl ight phase, in the “Gyro” line of the “Helicopter
mixers” menu - see the section starting on page 98.
Once you have entered these pre-defi ned - static - gain
settings (set separately for each fl ight phase in the
“Helicopter mixers” menu), you can use a transmitter
control such as the rotary proportional control CTRL 8
to vary gyro gain around the set “offset point”; all you
have to do is assign that transmitter control in the “Gyro”
line of this menu: in the centre position of the transmitter
control this corresponds to the setting selected in the
“Helicopter mixers” menu (see section starting on page
98). If the transmitter control is moved from this centre
point in the direction of full travel, gyro gain is increased;
towards the opposite end-point it is reduced. This is
a fast, simple method of fi ne-tuning gyro gain when
the model is in fl ight - perhaps to suit varying weather
conditions - or alternatively to fi nd the optimum setting.
In software terms you can also limit the gain range to
both sides by restricting the transmitter control travel.
However, please be sure to read the set-up notes
provided with your gyro before carrying out these
adjustments, as you could render your helicopter
uncontrollable if you make a mistake.
33112_mx12_HoTT_2_GB.indd Abs28:7833112_mx12_HoTT_2_GB.indd Abs28:78 06.06.2011 19:39:3906.06.2011 19:39:39