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Dual Rate / Expo
Confi gurable control characteristics for aileron, elevator and rudder
Using the arrow keys on the left or right touch pad, page
to the menu option "Dual Rate / Expo" in the multi-
function list:
Ser vo adjustment
Stick mode.
Control adjust.
Dual Rate / Expo
Channel 1 cur ve
Switch display
Tap the center
SET
key on the right touch pad to open
the menu shown below:
Ail
–––
100%
Ele
–––
100%
Rud
–––
100%
DUAL
SEL
The Dual Rate / Expo function permits switching or
controlling of control travels and characteristics for
aileron (Ail), elevator (Ele) and rudder (Rud) (control
functions 2 ... 4); it is switch-driven and fl ight-phase
independent.
The "Channel 1 curve" menu (see p. 116f.) can be
used to set an individual curve characteristic for control
function 1 (throttle/brake), featuring up to 6 separately
programmable points.
As with transmitter control travel adjustment on the
"Control adjust" menu, Dual Rate affects the relevant
control function directly, whether it controls a single
servo or multiple servos – via mixer and coupling
functions of arbitrary complexity.
The control travels for each switch position can be set to
108 Detail program description - Control adjust
between 0% and 125% of the normal full travel.
Expo, on the other hand, enables fi ner-grained control
of the model for values larger than 0% around the
center position of the primary control function (aileron,
elevator and rudder), without forfeiting full movement
at the end-points of joystick travel. For values less than
0%, the reverse is true: control increases around the
neutral position and diminishes towards the end-points.
The degree of "progression" can therefore be set within
a total range of -100% to +100%, where 0% equates to
the normal, linear control characteristics.
Rotary-output servos, now generally commonplace,
offer another application. This is because the actual
control surface movement is not linear: as the rotational
angle of the output disc or lever increases, the control
surface rate of travel over the control linkage continually
decreases – depending on the position of the linkage
point on the output disc. You can counteract this effect
with Expo values greater than 0%, so that angular travel
increases over proportionately as stick travel increases.
The Expo setting also affects the relevant control
function directly, whether this controls a single servo or
multiple servos – via any number of mixer and coupling
functions.
For both Dual Rate and Expo functions, switch
assignment can be set up in any way desired, which
therefore permits the triggering of multiple functions
using one and the same switch. This, in turn, offers the
opportunity to link the triggering of Dual Rate and Expo
functions to a single switch: this offers many advantages
– particularly for very high-speed models.
The graphic screen displays the curve characteristics
directly. Once you select a menu line, the dotted vertical
line follows the movement of the respective joystick, so
you can clearly see the dependency of the curve value
on the transmitter control.
Flight phase-dependent Dual Rate and Expo
settings
If you have set up fl ight phases in the "Phase settings"
and "Phase assignment" menus and assigned each of
these a name – e. g. "normal" – the name in question
is displayed at the bottom left. In this scenario, you can
operate the corresponding switch to switch between
fl ight phases.
Basic procedure
1.
Switch to the desired fl ight phase and then use
the arrow keys
on the left or right touch pad
to select your chosen menu line, i.e. "Ail", "Ele" or
"Rud".
2.
Using the arrow keys
on the left or right touch
pad, select the right column or the as-yet invisible
column for Expo values (see page 27).
3.
Tap the center
SET
key on the right touch pad. The
corresponding input fi eld is shown highlighted.
4.
Use
the arrow keys on the right touch pad to set your
chosen value.
5.
Tap the center
SET
key on the right touch pad to
complete data entry.
6.
If you tap the
or
keys on the right touch
pad at the same time (CLEAR), this will reset any
settings made back to their respective default values.
Dual Rate function
If you want to be able to switch between two variants,
assign a switch in the column marked with the switch
icon
at the lower edge of the display, as described in
the section "Assigning transmitter controls, switches and
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