Creating and customising models
8.2.6 Checking and adjusting the tail rotor
8.2.6.1 Checking / changing the direction of servo rotation for the tail rotor
The direction of servo travel must be checked and changed (if required) before
centre and travel are set.
When entering the basic settings do not connect the tail rotor servo via the gyro, but
directly to the respective receiver output. This ensures that the gyro has no effect on
your settings.
Move the rudder stick to the left, and observe the response of the tail rotor. Does
the pitch angle of the blades change in the correct direction? Otherwise, reverse
the tail rotor servo as described on page 141.
8.2.6.2 TAIL ROTOR mixer
The TAIL ROTOR mixer of the PROFI TX conceals the function "static tail rotor
compensation", which is also sometimes known as REVO-MIX (revolution mixer).
The TAIL ROTOR mixer is always displayed in the Mixer main menu when you set
up a model based on the model templates HELImech. or HELIccpm.
When a helicopter makes the transition from the hover into a climb or descent, the
torque which the tail rotor has to compensate becomes larger or smaller, with the
result that the model yaws in one direction. Once set up correctly, the TAIL ROTOR
mixer compensates for these torque fluctuations, and prevents the model yawing.
It also eases the task of the gyro system, so that you can set a high sensitivity
value and thereby obtain very good tail rotor stabilisation.
For this, the following parameters are required in the TAIL ROTOR menu:
Offset
To compensate for the torque at 0° collective pitch (main rotor), a small tail rotor
pitch angle (= Offset) is required. The value can be set separately in each flight
phase. This will be necessary if you use different system speeds in the various
flight phases.
In the flight phase AUTOROT (auto-rotation) the Offset parameter can be changed
so that no tail rotor pitch is present at all. This is particularly important if your model
helicopter features a driven tail rotor.
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