3.8 Digital trim
3.8.1 Overview
"Trimming" refers to the adjustment of the model aircraft to fly straight and level
when you leave the sticks exactly at centre.
Digital trim has two essential advantages:
ď‚· The physical position of a conventional trim with trim slider corresponds to the
actual trim value, while digital trim buttons do not. The digital trim position is
displayed on the screen, and any change to the trim values is stored in the
model memory. If you switch model memories, there is no need to move the
trim sliders to the correct position to suit the model. The correct trims are
immediately available.
ď‚· In models for which you have set up multiple flight phases each flight phase
has its own trim memory, i.e. it is simple to trim each flight phase accurately,
and independently of the trims in the other phases.
Example
The model aircraft should fly straight and level when you leave the sticks exactly at
centre. If this is not the case, the neutral point of the causal control function should
be corrected / trimmed.
Centre trim
The PROFI TX enables digital trim on each of the four stick axes.
"Centre trim" (the centre trim principle) is applied to the main control functions
"Aileron", "Elevator", and "Rudder". The trim only affects the control centre, but not
the end-points. Unlike standard trim, this offers the advantage that no control travel
must be reserved for trimming: the servo travel is used fully.
Both servo end-points remain unchanged, regardless of the current trim position.
3.8.2 Trim buttons
In the case of the PROFI TX, trimming is carried out using the buttons arranged
below and to the side of each stick unit (see section 3.1.1 "Top view" on page 23).
They are located in an ergonomically efficient position, and are easily reached
when 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 direction. If you hold the trim button pressed in for longer than
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