User's Manual

33
INSTRUCTION MANUAL
11.3.4.2 Synchronising servo groups
In particular large models often suffer from the problem that a
single servo does not have sufficient torque to drive the control
surfaces and so more than one servo must be connected to the
ailerons, elevator, rudder or landing gear. Due the slight difference
in reaction times and speeds of servos of the same type, all 2.4
Dual FHSS 12-22 series receivers offer the facility of synchronising
servos over their full throw to produce mirrored movements. The
servos must be connected rigidly together to ensure that the diffe-
rence in current drawn is kept to a minimum.
A synchronised group of servos must have a master servo and up
to 7 slave servos and it goes without saying that the servos must
be of the same make and type.
An example of a sound mechanical linkage of 2 servos driving a
Yak’s rudder
At this point, only the master servo should be con-
nected to the control surface. Do not connect the
slave servos yet!
During the automatic synchronisation process the
servo will move through all of the points along
the servo curve from end to end.
Make sure that the servo is free to move through
it’s whole range without causing any damage to
the servo, push-rods, linkages, horns or hinges. Al-
ways set the servo throw using the servo curve and
not the transmitter! Please refer to Para. 11.3.4.5.
A group of servos can be synchronised as follow. (The following
example is based on the configuration shown above):
Use the mouse to click onto the field ‘Single servo’, labelled ‘Ail left
5’ under the heading ‘Group’. A drop down window will appear
with the options Group A Master, Group B Master and Single servo
to choose from.
After choosing the following options for the 4 servos
Ail Le 3 -> Master Servo Group A
Ail Le 4 -> Slave Servo Group A
Ail Ri 7 -> Master Servo Group B
Ail Ri 8 -> Slave Servo Group B
You will see the following in the servo window:
2 groups have now been grouped to function 3. The master servo
fields will be coloured light green and brown and the slave servos
will be indicated by a light blue and a dark green field.
Function 3 is now driving two groups of two servos. One group of
two servos to drive the left aileron and one group of two servos
driving the right aileron.