User Manual

Note: You can also reverse a channel by changing ‘100’ to ‘-100’ in the Mixer screen.
With the controls going the correct way, check that you have sufficient control movement and not
too much. Adjust the mechanical linkage, i.e., the servo arm length and the control horn length, to
give the correct movement. Later, we’ll see how to use the features of the radio to adjust control
throws and response, but for now you should have a setup that works like a simple, non-
programmable transmitter. Power up and go flying!
Basic Improvements to the Model Programming
Now you have been out in the field and used your new radio, it’s time to refine the settings and
make flying a little easier, using the capabilities of transmitter programming. You probably want
some exponential for ailerons and elevator, as well as dual rates. Perhaps the throttle response is
not ideal. So let’s look at making your model behave better using craft, cunning and Ersky9x to its
full capability.
Expo and Dual Rates (D/R)
Expo, or to use the full name, exponential travel, reduces the control surface sensitivity around
neutral for softer response while retaining the same volume of travel overall, i.e., the control rate is
lower for small movements but higher for large amounts of stick travel. Depending on the geometry
of your servo arms, the linkage and the position of the horns on the control surface, as well as the
characteristics of the model, you will need different expo ratios to achieve the most comfortable
feel on different models. Note that Ersky9x uses positive numbers to describe regular expo; some
systems such as Futaba call the same thing negative expo (yes, it’s confusing!).
Dual (or triple) rates do what the name implies – give you a choice of overall response rate. So a
model might have low rate set up for takeoff, easy going cruising around, and landing, with high
rate for more extreme maneuvers. Rates for the three main controls can be set up so that all are
controlled by a single switch or each can be switched separately. Often, different expo settings are
associated with each rate and control.
Look at the graph in the example below. It is flatter in the middle than at the ends. This means that
the elevator moves less for stick movements near the centre than it does at the ends.
In Ersky9x, page 4/13 is dedicated to Expo/DR as shown below. Move the cursor to the first line,
where you can change which control stick is to be adjusted. Suppose we want to adjust elevator,
so press RIGHT to move to ELE. The rate will be shown as Hi until you set a switch to control it.
Start by adjusting High rate. Press DOWN to highlight the Expo values and use the LEFT and
RIGHT keys to set a fairly conservative expo value such as 25%. Then move DOWN to Weight,
which should already be set at 100%. Adjusting this is one way to fine tune the travel (the other
way is to use the Limits page 6/13).
First Steps with Ersky9X – Version 1 7 of 13