Dualsky FC120 User manual

#21435
Made in China 41ZX15E2810
Shanghai Dualsky Models co.,Ltd.
Rm.1016,No.201,Xin Jin Qiao Rd.,Shanghai,China.
Tel: [phone] Fax: [phone]
FC120
http://www.dualsky.com
FC120 Flight Control System
Instruction Manual
ＦＣ１２０固定翼飞行控制器使用说明书

E/R/A2
SYS
AIL1
MODE
AIL2
RUD
AIL1
ELE
FC120
3-axis Flight Control
AIL ELE RUD
NRNR N R
Packing List
● Mini dimension, MEMS gyroscope and accelerometer in one
chip, only 8 grams
● 32-bit high performance ARM MCU
● Original advanced flight control algorithm
● Support single/double aileron, fly wing and V-tail aircraft
● Support flaperon mixing
● Support aerobatic/3D airplanes
● Independent sensitivity adjustment of all 3 axes
● Support Futaba S. BUS protocol
● Gyro can be turned off
● Program via button and LEDs
● Support HV inputs
Caution: FC120 will take over all control channels
except throttle, if the setting of FC120 is
inappropriate, it might cause property damage or
personal injury. Please read the caution items and
the rest of this manual carefully before using FC120.
● Recommended to use this gyro on electric powered airplane
models or unpowered glider models
● FC120 need 2~3 sec start-up time after powered on, please
keep the airplane still during the process
● Servos will only work after the FC120 start-up process ends,
this is normal.
You need an at least 4-channel transmitter. If transmitter only
has 4 channels, FC120 will work in aerobatic mode by default
and can’t be turned off during flight. We recommend you for 5
channel transmitter so that the 5th channel (usually the GEAR
channel) can be used for turning off the gyro.
（c）
（a）
（d）
（b）
21021-1
Double
Side
Tape
（a）
FC120 Gyro x 1
（b）
Anti-shock double side tape x 1
（c）
3-signal wire (long) x 1
（d）
Single-signal wire (long) x 2
Radio equipment
- 2 -- 1 -
Thank you for using Dualsky FC120 Flight Control
System. This gyro is equipped with latest MEMS
gyroscope, 32-bit MCU and Dualsky original
algorithm. It features at mini dimensions, high
sensitivity and friendly user interface, more features
are listed below:

E/R/A2
SYS
AIL1
MODE
AIL2
RUD
AIL1
ELE
FC120
3-axis Flight Control
AIL ELE RUD
NRNR N R
- 4 -- 3 -
Installation instruction
1.FC120 installation principle:
2.Connect the FC120 to receiver as shown below
Normal Receiver
MODE
AIL1
E/R/A2
CH5/GEAR
Rudder
Aileron1
Elevator
Reserved
AIL
ELE
THR
RUD
CH5
Aileron2
AIL2
(Orange)
(Red)
(Brown)
● FC120’s heading direction must be the same as airplane
heading direction
● FC120 must be mounted parallel to flight path, otherwise
airplane will yaw.
● FC120 should be installed inside of the airplane, close to the
receiver and CG
● Install platform must be parallel to horizontal tail, solid
(recommend to use plywood), but do not use servo mount
platform
● Use accessary double side tape to fix FC120, do not use strap,
patch or 3M Dual-Lock
● Do not wrap FC120 in foam
● FC120 cannot be touched by servo horn, linkage or other
moveable parts
● FC120 must stay away from motor, engine, ESC and batteries
● FC120 cannot be installed outside the airplane, such as wings
or tail

E/R/A2
SYS
AIL1
MODE
AIL2
RUD
AIL1
ELE
FC120
3-axis Flight Control
AIL ELE RUD
NRNR N R
- 6 -- 5 -
● Input/output signal wires are close to the top of FC120, middle
is VDD and bottom is GND.
● Input signal supports Futaba S.BUS and S.BUS2, only need
single-signal wire to connect SYS and receivers’ SBUS port.
SYS port has higher priority than other input ports. When using
SYS port, other input ports won’t work, transmitter channel
sequence must be the same as following chart:
Sequence
Channel
CH1
Aileron 1 Elevator
CH2
Throttle
CH3
Rudder
CH4
Mode Switch
CH5
Aileron 2
CH6
3.FC120 corresponding control surface
● Normal type airplane with single or double ailerons
E/R/A2
SYS
AIL1
MODE
AIL2
RUD
AIL1
ELE
FC120
3-axis Flight Control
AIL ELE RUD
NRNR N R
OUTPUTINPUT
Normal Airplane PIN (Socket) Location
Aileron
Elevator
Rudder
Aileron 2
TOP MIDDLE BOTTOM
VDD
VDD
VDD
VDD
GND
GND
GND
GND
VDD
VDD
VDD
GND
GND
GND
Switch
Aileron
Elevator
S.BUS
Rudder Aileron 2
* VDD is positive lead. *GND is negative lead.
* Diagram show double aileron airplane
● Fly-wing(delta-wing)
S.BUS Receiver
SBUS
Rudder
Elevator
Aileron2
Aileron
Rudder
Aileron
Elevator

- 8 -- 7 -
4. FC120 Power Supply
E/R/A2
SYS
AIL1
MODE
AIL2
RUD
AIL1
ELE
FC120
3-axis Flight Control
AIL ELE RUD
NRNR N R
OUTPUTINPUT
Fly-wing/Delta-wing PIN (Socket) Location
Aileron
Elevator
Rudder
N/A
TOP
Switch
Aileron
Elevator
S.BUS
MIDDLE
VDD
VDD
VDD
VDD
VDD
VDD
VDD
Rudder
BOTTOM
GND
GND
GND
GND
GND
GND
GND
N/A
* VDD is positive lead. *GND is negative lead.
E/R/A2
SYS
AIL1
MODE
AIL2
RUD
AIL1
ELE
FC120
3-axis Flight Control
AIL ELE RUD
NRNR N R
OUTPUTINPUT
V-tail Airplane PIN (Socket) Location
Aileron
Elevator
Rudder
Aileron2
TOP
Switch
Aileron
Elevator
S.BUS
MIDDLE
VDD
VDD
VDD
VDD
VDD
VDD
VDD
Rudder
BOTTOM
GND
GND
GND
GND
GND
GND
GND
Aileron2
* VDD is positive lead. *GND is negative lead.
● V-tail airplane
* V-TAIL
FC120 supports 4.8V-8.4V voltage input, share the same power
with receiver, input voltage should meet the requirements of
receiver, too. Power supply could be battery or ESC.
Set mode switch
Mode select switch is used for
turning on or turning off the gyro.
Please assign a 2-position switch to
mode channel and make sure that
channel doesn’t have other
functions. Switch channel pulse
width range should be low
800~1700us, high 1700~2200us. If
the mode channel is not connected,
the FC120 will work in aerobatic
mode.
L2
Blue(0.5S)
LOW
Aerobatic Mode: Position high, 3 axis gyroscope working
Gyro Off Mode: Position low, FC120 outputs receiver’s signal
directly
Elevator
Rudder
Aileron
Aileron2
High(+100)
2200us
1700us
800us
Low(-100)

E/R/A2
SYS
AIL1
MODE
AIL2
RUD
AIL1
ELE
FC120
3-axis Flight Control
AIL ELE RUD
NRNR N R
- 10 -- 9 -
NOTE: You may need to reverse mode channel for
correct switch operation.
!
How to setup gains and correction directions?
There are 3 pots to adjust the correction directions and gains for
aileron (roll), elevator (pitch) and rudder (yaw) channel. Please
see the sketch below.
AIL/ELE/RUD
High High
Low
OFF
NOR GAIN
Low
REV GAIN
● It needs a few testing fly to determine appropriate gains, we
recommend starting from conservative gains (low) first
Ground Test
● Please do a ground test before first flight.
● Test if the mode switch is working properly. Do not turn on the
motor/engine, toggle the mode switch on the transmitter to high
position, LED2 will turn GREEN for 0.5sec, now FC120 is in
Aerobatic mode.
● Test gyro correction direction. Rotate the model on each axis,
corresponding control surface should act to against that rotation.
If the action is wrong, please reverse the pot of that axis.
L2
High Green(0.5S)
● Fly in aerobatic mode at safety altitude, accelerate the
airplane to its maximum speed to see if there is oscillation in
pitch, roll or yaw axis. oscillation indicates the gain is too high,
please slow down the airplane, decreasing the gain after landing
● Please don’t adjust the gain too much one time, it’s
recommend adjusting 5-10 degrees one time
Roll & Aileron Movement

- 12 -
Trim system
● First please trim model directly on your transmitter in gyro off
mode. But if transmitter trim is too large, please zero the trim and
adjust the model by changing the length of the linkage between
the servo arm and the control horn.
- 11 -
● Do not directly switch to Aerobatic mode after trimming in gyro
off mode, you need to land the plane and power on your plane
again.
● There is no need to trim in Aerobatic mode if last step finished.
FC120 Setting
● How to enter Setting Mode: Turn on the transmitter, move the
throttle to its minimum; power on the model, wait until the L1
green LED ends flashing; Long Press “SET” button (2sec) to
enter Setting Mode. After that, L1 displays the corresponding
SETTING ITEM and L2 shows the corresponding SETTING
VALUE.
● Test transmitter moving direction. Move the sticks (except the
throttle) to see if each control surface is working rightly.
Pitch & Elevator Movement
Yaw & Rudder Movement

- 14 -
● “SET”Button usage:
⑴.Long Press (more than 2 sec) : enter Setting Mode
⑵.Single click in Setting Mode: switch between SETTING ITEM
⑶.Double click (finish within 0.5sec) in Setting Mode: change
SETTING VALUE
⑷.Long Press in Setting Mode: Save and quit to flight mode
● Please check the chart below for all settings
- 13 -
LED Status
LED1 STATUS
Green flashing
Green solid
Red solid
FC120 STATUS
Initializing
Initialization
completed, signal OK
Initialization
completed, no signal
LED2 STATUS
Blue on for 0.5 second
Green on for 0.5 second
FC120 STATUS
In gyro off mode
In aerobatic mode
Blue
(default)
Normal
Green
Delta
wing
Red
V-tail
Yellow
Blue Install direction
Face
down Face right Face left
L1(LED)
Green Airplane type
Face up
Item L2(LED)