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The E-CCPM(Electric Cyclic/Collective Pitch Mixing) system offers the
users a control system that can accomplish the same control as
traditional M-CCPM(Mechanical Cyclic/Collective Pitch Mixing) system,
but with simple machinery. The 120E-CCPM system utilizes 3 servos
for the main control of aileron, elevator and collective pitch. The 3
servos work independently from each other of M-CCPM system, but
they work as a team to achieve the same control of the E-CCPM
system. For example, if a collective input is given, all of the 3 servos
work together to move the swashplate up and down. If an aileron input
is given, 2 servos work at the same time to make the swashplate
inclined. With servos working together during any given command,
the torque is maximized. In addition, E-CCPM system execute the
given control inputs with less complex mechanical mixing systems and
require less control rods and parts.
In today’s modern computer radio system, the E-CCPM system is
established in the program. Since the 120E-CCPM function are pre-
programmed, there is no more complicated mixing/setup than the M-
CCPM system. For the radio type and brand, please choose which
has the 120E-CCPM function. Please note that it is not possible to
use a non-E-CCPM radio system for E-CCPM operation without any
other electronic mixer.
INTRODUCTION OF E-CCPM CONTROL SYSTEM
The given inputs are executed by the team work of the 3 servos
through the mixing program of the radio or the electronic mixer. The
following are the examples showing how the movement be carried
out.
COLLECTIVE PITCH
When a collective pitch command is given, all of the 3 servos move
toward the same direction with same speed and same travel distance.
This movement is to raise or lower the swashplate and keep the
swashplate level. Thus, the required collective pitch can be reached
without cyclic input.
MOVEMENT OF 120
ECCPM SYSTEM
AILERON
Aileron is controlled by the 2 servos in the front. When an aileron
command is given, one servo will pull the swashplate downward and
the other will push the swashplate upward so that the roll command
is executed. They move contrary with same speed and travel distance,
and the third servo in the back remains still at this moment.
ELEVATOR
The elevator is controlled by all of the 3 servos. When an elevator
command is given, the 2 servos in the front move in the same direction
and the third one move contrary. For example, when a down elevator
command is given, the 2 front servos pull the swashplate downward
and the third one push the swashplate upward so that the down
elevator command is executed. The 3 servos pull/push the swashplate
at the same time to accomplish the given command.
MOVEMENT OF 120
ECCPM SYSTEM
SERVO CONNECTING
E-CCPM system requires 3 channel for aileron, elevator and an AUX(for
pitch). But people may get confused because the 3 channels are not
referred to any independent movement. They are operated together
to carry out the rolling, flipping and collective controlling. As a result,
the following connecting manner is recommended.
1. The rear servo located in back of the swashplate MUST be plugged
into the elevator channel.
2. Suppose the servo in the right side is plugged into the aileron
channel.
3. The left servo is plugged into the AUX channel.
The following chart is the E-CCPM connecting for your reference.
Please also consult your radio instruction manual.
Because people may be confused with the operating manner of the
E-CCPM system, we want to explain the basic concept of how to center
and trim the servo while adjusting the full travel distance.
First of all, we have to make it clear about what do you want to adjust.
Do you want to adjust the servo itself or the control surface? For
example, if you want to adjust the servo which is plugged into the
aileron channel itself, only the servo will be adjusted. But if you want
to adjust the aileron "rolling" surface, the two servos plugged into aileron
and AUX channels will be adjusted. Making clear of this basic concept
will simplify the process of adjustment.
Furthermore, you have to realize the function of “Reverse”, “Sub Trim”,
“Trim”, “Travel Adjustment”, “D/R & EXP” and “Swash Mixing” of the
transmitter. There are different names for those functions between
different brands of the radio, but their definitions are basically the same.
The following table shows the functions which those items refer to:
BASIC CONCEPT OF ADJUSTMENT
Therefore, if you want to adjust servos themselves, please use the
“Reverse”. “Sub Trim”, and “Travel Adjustment”. If you want to adjust
the control surface, please use the “Trim”, “D/R & EXP” and “Swash
Mixing”.
For example, it is necessary to do minor centering adjustments to
achieve the desired servo arm position with the “Sub Trim” function.
Under this circumstance, you have to adjust the servo itself, not the
control surface.
Reverse
Sub Trim
Travel Adjustment
Trim
D/R & EXP
± Aileron
± Elevator
± Pitch
Adjust the Servo Itself
Adjust the Control
Movement
Items
Swash
Mixing
○
○
○
○
○
○
○
○
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Before starting, make sure the following preparation is done.
1. Set all trims, knobs, and switches to the neutral and zero position.
2. Reset the radio to its factory preset position.
3. Choose the 120E-CCPM swashplate control mode.
Reversing/Swash Mixing
The moving direction of servos has to be confirmed. You can attach
the servo arms to the servos temporarily so that it makes it easier to
see the servos moving direction. While giving a positive collective
pitch, all of the 3 servos are supposed to be moving in the same
direction to descend the swashplate. If the 3 servos are moving in
the same direction but to raise the swashplate, you have to use the
“swash mixing” function to make it descend. If any of the servos is
moving contrary, you have to adjust the one by “reverse” function.
Since the moving manner above is determined, the “reverse” function
of Aile/Elev/AUX is done.
Next, you have to check the control surface. While giving a cyclic pitch
control, the swashplate has to be tilted toward the correct direction.
If not, you have to adjust it by “swash mixing” function. For example,
if a down elevator command is given, the swashplate is supposed to
be tilted forward. If the swashplate is tilted rearward, you have to
change the +/- of the elevator control surface by “swash mixing”
function. So as the aileron control surface.
To sum up, the “reverse” function is to adjust the servo itself, and the
+/- of the “swash mixing” function is to adjust the control surface.
Servo Arms
After the moving direction of the servos is determined, please center
the collective control stick. With the collective control stick is centered,
install the servo arms of the 3 servos. They are supposed to be level.
If the servo arms tilt with a small degree, use the “sub trim” function
to adjust it independently. Thus the procedure of centering is complete.
CONCEPT OF BASIC SETTING AND ADJUSTMENT
Level the Swashplate
After centering the servos, setting the length of the control linkages
and attaching them to the link balls, it is important to check the
swashplate that it is level. Turn on the transmitter and the receiver,
do not connect the Motor at this moment, and center the collective
pitch stick. Make sure all the trims and knobs are centered and the
pitch curve should be 0% at low end and 100% at high end at present.
The servo arms should be level. While the collective pitch stick is
centered and the servo arms are level, the swashplate is supposed
to be level. First, check the swashplate from the rear of the model to
insure if it’s level from left to right. If the swashplate is not level as
compared to the frame of the model, adjust either the left or right
servo control rods. Next, check the swashplate from a side of the
model to insure if it’s level from head to rear. If the swashplate is not
level, adjust the control rod of the servo in the back.
CONCEPT OF BASIC SETTING AND ADJUSTMENT
It always happens that the travel of each servo varies slightly. If so,
the swashplate would be tilted when giving a full collective pitch
command. These variations can be corrected by altering the travel
value of each servo slightly by using the “Travel Adjustment” function.
Pitch to Aileron Mixing
Place the collective stick to the full positive pitch position. Check the
swashplate from the rear of the model to insure if it’s level from left to
right. If the swashplate is not level as compared to the frame of the
model, adjust either the servos by using the “Travel Adjustment”
function.
For example, the swashplate has been tilted to the right side while
giving full positive collective pitch. It indicates that the left servo’s travel
is less than the right servo’s travel. You can either increase the travel
of left servo or decrease the travel of right servo. Check the swashplate
again to insure that it’s level.
It is necessary to repeat the procedure while giving full negative
collective pitch. Check if the swashplate is level and adjust the servos
as needed while the full negative collective pitch is given.
COLLECTIVE TO CYCLIC MIXING ADJUSTMENT
Pitch to Elevator Mixing
Through the previous step, we’ve got rid of the pitch to aileron mixing.
It is as important to vanish the pitch to elevator mixing. Place the
collective stick to the full positive pitch position. Check the swashplate
from a side of the model to insure if it’s level from head to rear. If the
swashplate is not level, adjust the elevator servo by using the “Travel
Adjustment” function.
For example, the swashplate has been tilted forward while giving full
positive collective pitch. It indicates that the elevator servo’s travel is
less than the rest two’s travel. Please increase the travel of elevator
servo. Check the swashplate again to insure that it’s level.
It is necessary to repeat the procedure while giving full negative
collective pitch. Check if the swashplate is level and adjust the elevator
servo as needed while the full negative collective pitch is given.
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Level
Level
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COLLECTIVE TO CYCLIC MIXING ADJUSTMENT
Decrease
Increase
Increase
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The lengths of the linkage rods are recommended as the following:
SETTING UP OF LINKAGE
The pushrod length above is suitable for beginner and 3D flying. You
can use those lengths as the starting setting, and adjust the lengths
for your flying style. The lengths of the pushrods are measured from
the center of the linkage ball to the center of another.
Lengths are measured
from ball link center to
ball link center.
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