Digital Trim; Overview - Multiplex Profi TX Operating Instructions Manual

2.8
2.8.1
Page 50
Refer to "Training" on page 99 for details.
Teacher mode
A free switch on the teacher transmitter and the COPILOT module are required for
the Teacher mode (see section 10.2 "Accessories" on page 213):

Refer to section 2.3.4 "Installing additional controls" on page 36 for
information on how to install a switch.

Refer to section 5.4.2 "Assign.Switches" on page 173 for information on how
to assign the switch to the trainer function.

Refer to section 2.3.5 "Installing additional modules" on page 39 for
information on how to install the COPILOT module.
In Teacher mode, the selected control functions can be controlled by the student
transmitter. These control functions are selected in the Setup > Training menu.
The selection list is only available in Teacher mode.

Digital trim

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:

Digital trim buttons do not have any physical position corresponding to the
actual trim value (which is the case for conventional trim with trim sliders).
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.

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.
Transmitter
PROFI TX