Operation Manual
27
TIP: Using Dual Rates to harmonise the control response when using the V-tail or
DELTA mixer
You can use the DUAL RATES facility to adjust the two inputs of a V-tail (rudder and
elevator) or DELTA mixer (aileron and elevator). When used in this way a physical
Dual Rates switch is not required.
Example
The elevator response of your V-tailed model may be too powerful, but its rudder
response is normal.
Solution: reduce the elevator travel with the Dual Rates elevator setting (DRATE HR).
8.4.2. Exponential (EXPO)
Exponential (EXPO) is used to provide finer control around the centre position of
the transmitter stick, i.e. stick movements up to about 50% of full travel produce
relatively slight servo movements, depending on the set EXPO value. However,
servo movement increases towards the stick end-points, and full servo travel is still
available at the extreme. EXPO is often used to „tame“ models which are otherwise
too sensitive to the controls for normal
flying.
EXPO can be set up to apply to the
three primary functions aileron, eleva-
tor and rudder, or roll, pitch-axis and
yaw in a helicopter. The default EXPO
value is 0%. The EXPO value can be set
separately for all three control func-
tions within the range 0 - 100%, but,
unlike Dual Rates, EXPO cannot be
turned off by a physical switch.
!!
EXPO is not switchable!
This is how you set EXPO:
Procedure Display
1.
Select the EXPO Q setting in the DRATE menu (e.g.
for aileron) and switch to the second line
2.
Now select the EXPO value, e.g. 50%
3.
Return to the first line
Continue as shown in the flow chart
Repeat steps 1 - 3 as necessary for the other two transmitter controls.
!!
Note for EXPO values:
If you set EXPO to a large value, the exponential increase in servo travel is very great
once it has reached a certain deflection. The result can be such a drastic change in
the model’s behaviour that it is difficult to control at all. For practical flying a sensi-
ble range of EXPO values with the Cockpit system is 40 – 60%.
Servo
travel
Control travel
-
100%
+100%
+100
%
0%
0%
linear
(EXPO = 0 %)
exponential
The principle of Expo