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X20/X20S and Ethos v1.2.10 User Manual
Expo
In the Rates examples above you can see that the output response is linear. To avoid
the response being too twitchy at the stick centers, you can use an Expo curve to
reduce the control surface movement at center stick and to increase it as the stick
moves further from center. For this example we have set three Expo rates to 60%,
40% and 25% on the corresponding SB switch positions, and the graph now shows a
curved response which is flatter at stick center.
For Ailerons there is another special setting called Differential. If the left and right
ailerons move up or down by the same amount, the downward moving aileron will
cause more drag than the upward moving aileron, causing the wing to yaw in the
opposite direction to the turn. This is known as adverse yaw. To reduce this a positive
value in the Differential setting will result in less downward aileron movement, as can
be seen in the graph. This will reduce adverse yaw and improve turning/ handling
characteristics. A common aileron differential setting is 50%.
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