Glossary of technical terms
Differential
Indicates the percentage by which the travel distance of the control surface
down is reduced relative to the travel distance up; if the differential is set to 50%,
the travel distance down is half as great as the travel distance up. The higher
the % value, the shorter the travel distance of the control surface down.
Differential is required because the downward control surface generates greater
drag than the upward control surface. This results in a negative turning moment
(known as adverse yaw) which tends to push the model out of the turn.
Digital trim
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 the trim values are 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.
If the PROFI TX 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 simple to trim each
flight phase accurately, and independently of the trims in the other phases.
DTC
Direct Throttle Control
If DTC is switched on, the throttle channel (regardless of whether it acts upon a
carburettor or a speed controller) is controlled directly by the transmitter control
assigned to throttle limiter, and is independent of the position of the collective
pitch stick.
Dual rate (D/R)
Alters the sensitivity of particular transmitter controls. If the D/R parameter for a
control function (e.g. Aileron) is set to 50% you can use the assigned switch to
reduce the control surface travels on the model by half for finer control. The
control curve in the graph changes accordingly when you operate the switch
assigned to dual rate.
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