Operation Manual

ROYAL evo
Seite 22
11. Digital trims
11.1. Introduction
The ROYALevo features modern digital trims for the 4
primary control axes (stick functions).
The trims of the ROYALevo operate on the “Centre Trim”
principle, i.e. trim corrections only affect the range a-
round the centre of the stick travel, and not the end-
points. The advantage compared with conventional
trims is that the full control travel (and thus servo travel)
remains available, so you do not need to provide a re-
serve for trimming.
Dead zone
not
accessible
Centre Trim principle
Trim
Untrimmed
Standard
trim
Top
end-point
Bottom
end-point
Stick travel
Servo travel
Standard trim
The diagram shows what happens when the stick is
moved to the right: the servo moves to the top end-
point before the stick reaches its end-point. This means:
dead zone at one extreme of stick travel.
When the stick is moved to the left, the servo fails to
reach the bottom full travel point. That means: full servo
travel is not available.
Centre trim
Both servo end-points are always reached, regardless of
the trim position.

TIP !
Since the response curve of the transmitter control is
altered when you adjust the “Centre Trim”, it is impor-
tant that trim corrections should be relatively small. If
major corrections are required, always adjust the me-
chanical linkage!
11.2. Advantages of digital trims
Digital trims have two important advantages:
1. The trim buttons do not have a mechanical position
corresponding to the trim value (as is the case with
a conventional trim system with trim sliders). The
trim setting of the digital trim is displayed on the
screen, and the trim values are stored in the model
memory. If you change to a different model mem-
ory, the trim is immediately correct; you do not
have to move the trim slider to adjust the transmit-
ter to the new model.
2. The ROYALevo
features flight phases, and each
phase features its own trim memory for models u-
sed with flight phases. Each flight phase can easily
be trimmed accurately and independently of the
other phases.
11.3. The cruciform digital trim assembly
The trims of the ROYALevo take the form of buttons
arranged in a cross, located below and to one side of
the stick units. They are located in an ergonomically
optimum position, and can be reached easily when the
transmitter is hand-held or installed in a tray.
Each press of a trim button
effects a trim adjustment
around the corresponding
control axis in the direction
of that button.
If you hold a trim button
pressed in for longer than
about 1 second, the trim
continues to increment
until you release the but-
ton (AUTO-REPEAT).
Each trim step (increment) is accompanied by a confir-
mation beep. When you reach the trim centre position,
and when you reach the ends of the available trim ran-
ge, you will hear different sounds. You can switch the
trim beeps OFF if you prefer (Î 13.1.2.).
!
The trim of the 4th stick axis (‡) always works
in idle trim mode for throttle!
This is also valid if SPOILER is assigneed to this H
and for helicopters.
11.4. On-screen trim display
The trim settings are displayed on the screen in status
displays 1-3. They take the form of graphic displays in
bar form, on both sides and the bottom of the screen:
Starting from the trim centre position, a maximum of 20
trim steps are available in both directions. The trim in-
crements can be set to any of 4 values from 0.5% to
3.5% ( TStep Î 14.2.3).
!
Note: Trim step width, trim range
When you alter the trim step, the number of
steps stays the same. This means that both the
trim range and the actual trim value (!) are
changed, i.e. you must adjust the trims again if
you alter the trim increment size.
The current trim value is displayed on the screen in
graphic form, but it can also be displayed numerically if
you wish (parameter Trim Î 14.2.2)
There are several variations in the form of the graphic
trim display shown in the status display (parameter
Trim graph Î 13.1.1)

TIP !
Reset trim to centre
If you press both buttons for one of the trimmed axis
simultaneously, trim is set to centre for the currently
active flight phase. This applies also to throttle.