Advantages Of Digital Trims; The Cruciform Digital Trims; On-Screen Trim Display - Multiplex Royal SX 9 Instructions Manual

When the stick is moved to the left, the servo does not
reach full travel in the "down" direction. This means:
available servo travel which cannot be exploited.
Centre trims:
The servo runs to both end-points regardless of the
associated trim setting.

Tip:
Since Centre Trims alter the effect curve of the trans-
mitter control, it is important to limit trim corrections to
small values. If a large correction is required, it is al-
ways best to adjust the mechanical linkage.
9.6.2.

Advantages of digital trims

Digital trims offer two significant advantages:
1. The physical position of a conventional trim (with
trim slider) corresponds to the actual trim value,
but digital trim buttons do not. Instead the digital
trim position is displayed on the screen, and the
trim values are stored in the model memory. If you
switch model memories, the correct trims are im-
mediately available, i.e. there is no need to move
the trim sliders to the correct position to suit the
model.
2. If the ROYAL SX is used with a model for which
you have set up multiple flight phases, each flight
phase has its own trim memory, i.e. it is an easy
matter to trim each flight phase accurately, and
independently of the trims in the other phases.
9.6.3.

The cruciform digital trims

In the case of the ROYAL SX, trimming is carried out
using the buttons arranged in a cross-shape below
and to one side of each primary stick unit. They are
located in an ergonomically efficient position, and are
easily reached when you are using the transmitter,
whether hand-held or in a tray.
The effect of each button-press is to shift the trim of
the associated control axis in the corresponding direc-
tion. If you hold the trim button pressed in for longer
than about 0.5 sec., the trim value changes con-
tinuously until you release the button once more
(AUTO-REPEAT function).
Each trim increment (step) is accompanied by an au-
dible beep. When the trim reaches Centre or either
end-point of the trim range, the transmitter emits dif-
ferent beeps to inform you of the position. The trim
beeps can be switched OFF and ON ( 14.1.1.).
!
The trim of the fourth stick axis (‡) always
acts as throttle idle trim!
This also applies to gliders (powered gliders) if
this stick controls Spoiler, or model helicopters
if this stick controls Collect. (collective pitch).
9.6.4.

On-screen trim display

The trim positions are displayed in graphic form at
both sides and the bottom of the screen in Status dis-
plays 1 - 3:
Starting from the trim centre position, the maximum
trim range is twenty increments in both directions. The
trim increment (step, or adjustment rate) can be set to
any of four magnitudes (0.5%, 1.5%, 2.5%, 3.5%) (
15.4.2.).
!
Note regarding increment size and trim range:
the number of steps remains the same even if
you change the size of the trim increment,
with the result that both the trim range and
the absolute trim value also change! This
means: if you alter the trim increment size,
you must remember to re-trim the model.
The current trim value is displayed in graphic form on
the screen, but can also be read off as a numeric
value for each transmitter control (Parameter Trim 
15.4.1.).
The type of graphic display can be selected in the
Status screen (Parameter Trim graph (Trim graphic)
 14.1.4.).

Tip!
Resetting the trim to Centre:
Simultaneously pressing both trim buttons for any
stick axis resets the trim for the currently active flight
phase to Centre. This also applies to throttle trim.
Manual
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