FeiYu Tech FY-41AP Lite User manual

FY-41AP Lite AutoPilot & OSD System
Installation & Operation Manual
Guilin Feiyu Technology Incorporated Company
Addr : 3rd Floor,B,Guilin Electric Valley ,Innovation Building,
Information Industry Park,Chao Yang Road,
Qi Xing District,Guilin 541004,China
Website: www.feiyu-tech.com
Email: [e-mail]

Guilin Feiyu Technology Incorporated Company.
http://www.feiyu-tech.com [e-mail]
Table Of Content
User Agreement ............................................................................................................................................................1
1. FY-41AP Lite AutoPilot System Introduction..................................................................................................2
2. Function Introduction..........................................................................................................................................3
2.1 FY-41AP Lite Single Module Function..................................................................................................3
2.2 FY-41AP Lite With GPS Function............................................................................................................4
2.3 OSD Video Overlay System Function ...................................................................................................5
2.4 FY-41AP Lite Can Be Connected To A Data Link ..............................................................................5
3. FY-41AP Lite Configuration ...............................................................................................................................5
4. FY-41AP Lite Connection Summary................................................................................................................7
5. S1~S8 Servo Interface Connection Instructions ........................................................................................8
6. Connection Introduction ....................................................................................................................................8
7. Main Module Installation ................................................................................................................................ 10
7.1 FY-41AP Lite Module Installation ....................................................................................................... 10
7.2 GPS Module Install................................................................................................................................... 11
7.3 Power Manager Module Install ........................................................................................................... 11
7.4 Airspeed Sensor Module Install .......................................................................................................... 11
7.5 Remote Control Setting: SW1&SW2.................................................................................................. 12
7.6 Gyroscope Reset ....................................................................................................................................... 12
7.7 FY-41AP Lite Indicator Light Instruction .......................................................................................... 13
7.8. OSD Interface Instruction ..................................................................................................................... 14
8. FY-41AP Lite Setting.......................................................................................................................................... 15
9. FY-41AP Lite First Flight Test Checklist.......................................................................................................... 27
10. Other Functions And Settings ..................................................................................................................... 29
10.1 Switch ( SW2 ) Function Setting................................................................................................... 29
10.2 RC Max Distance Setting................................................................................................................. 29
10.3 Circling Radius Setting..................................................................................................................... 30
10.4 The Altitude Of Return To Launch Instructions....................................................................... 30
10.5 FAIL-SAFE Setting .............................................................................................................................. 31
10.6 Fixed Altitude & Heading Lock Mode Instruction................................................................. 31
10.7 3D Mode Instruction ........................................................................................................................ 32
10.8 Auto Circling Mode Instruction.................................................................................................... 32
10.9 Link Mode (RC Receiver Control Mode/Data Radio Control Mode) ............................... 32
Appendix...................................................................................................................................................................... 33
Appendix : Flight Area Map Making..................................................................................................... 33

Guilin Feiyu Technology Incorporated Company.
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Page 1
Dear Customer :
Thank you for choosing FY-41AP Lite as your autopilot system. Please read this
manual carefully to ensure correct installation & operation.
User Agreement
The use of FY-41AP Lite is prohibited for any illegal intentions and purposes. The
user will be fully responsible for the use of this product and FY-Tech will not be held liable
it's misuse either in its original or altered state by the customer (including the direct,
indirect, or third party losses caused by a faulty plane or plane crash).
Please read this manual carefully before using this product. If you have any questions,
do freely contact us and we will attempt to provide you with a satisfactory clarification
and/or resolution should it be required. The products’ functions maybe changed only by
firmware upgrades which is available from our website from time-to-time. Please do check
our website for available firmware upgrades. The company reserves the right to alter the
contents of the product firmware.
This agreement takes immediate effect upon the purchase of the product.
Attention
The installation and use of this device require some skill and knowledge in flying
remote controlled aircraft.
If you are a complete beginner & have never flown one before, we do not recommend
you install this device on your own. Please find an experienced RC pilot who may provide
you with the basic knowledge required to use this device successfully.
If you are already an experienced flyer, you will find the FY-41AP Lite installation to be
easy & logical. Follow this manual & you won’t go wrong.
If you need further technical support, contact us at: [email protected]

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1. FY-41AP Lite AutoPilot System Introduction
FY-41AP Lite Module
FY-41AP Lite is an inertial attitude measurement instrument used for FPV flight on
fixed-wing aircrafts. It has an integrated OSD video overlay system that presents critical
flight information such as power management, airspeed, altitude, and flight direction via its
sensors and GPS module, allowing for a clear visual flight while ensuring key information
is within sight.
The new FY-41AP Lite with its enhanced altitude control and GPS module, can now
realize improved pinpoint inertial navigation and automatic piloting.
Flight stabilization is achieved via an integrated 3 axis gyro, 3 axis accelerometer,
and a barometric pressure sensor. This enables the module to accurately measure flight
attitude, earth azimuth & relative altitude to achieve:
Extremely stable conventional flight pattern
Stabilized 3D flight
Automatically return to home (RTL)
Fixed altitude flight
Heading lock flight
Auto circling over a fixed GPS location.
GPS Module
GPS module enables the FY-41AP Lite to calculate the flight course & sense the
exact location of the aircraft. GPS data allows aircraft return to home (RTL), auto circle,
and control straight line navigation.
Airspeed Module
The FY-41AP Lite can be connect to the airspeed sensor (When don’t connect the
airspeed sensor, the FY-41AP Lite also can work normally).The airspeed sensor can
measure the airspeed of the aircraft. Compared to the GPS speed the airspeed have the
characteristics which is small delay and small affected by the wind. This characteristics
can achieve the effective control of the throttle, improve the efficiency of flight and flight
safety
OSD System
FY-41AP Lite has integrated OSD hardware with optimizing display interface. Critical
flight parameters are displayed like altitude, speed, direction, flying voltage and amp draw,
and most display parameter outlay can be changed via RC control.

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Power Manager Module
FY-41AP Lite can connect power manager module which is integrated with current
sensor module and Voltage-Regulating module. Current Sensor is used to check voltage,
Amp draw. The integrated Voltage-Regulating module provides stable +12V to FPV video
camera and video transmitter.
Altitude Control
Altitude control is achieved using a high sensitivity barometric sensor which
measures relative height. Altitude is fixed via elevator servo control and throttle
management.
Heading Control
Under the condition of without GPS module, heading control is achieved by the
inertial device. Both the aileron & rudder servo is used to control flight heading. But it will t
influence of wind deviation from the original route.
Under the condition of connect to the GPS module, GPS data is used to automatically
correct heading even in windy conditions.
Speed Control
Under the condition of without airspeed sensor but connect to the GPS module, GPS
module provide the speed and altitude information for the throttle control to achieve the
control of the speed.
When connect to the airspeed sensor, the airspeed information will available and use
for controlling the throttle, and the speed control is more reliable and accurate.
2. Function Introduction
2.1 FY-41AP Lite Single Module Function
Note: Not use the GPS module
●Activated Mode In this mode, the FY-41AP Lite auto stabilization is turned off.
The aircraft is completely under pilot control.
●Stabilized Mode Level flight is automatically maintained, making flight simple,
especially for beginners. If a pilot feels the plane is out of control, simply reduce input
control and the plane will automatically recover level flight.

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● 3D Mode If no input is given by the pilot (all sticks in the middle position), 3D
mode will lock the current aircraft attitude. Therefore the aircraft can be easily
maneuvered to complete a variety of 3D flight with added stability & smoothness.
● Fixed altitude & Heading lock Mode This mode maintains aircraft flight course
& holds the altitude on activation.The system automatically corrects flight course deviation
& maintains straight-line flight.
● Auto Circling Mode On activation, the plane will maintain altitude and flight speed,
while initiating a counterclockwise circle, but this is not hovering around a fixed point, is
likely to be blown away from the original place of circle.
2.2 FY-41AP Lite With GPS Function
● Fixed altitude & Heading lock Mode This mode maintains aircraft flight course
& holds the altitude on activation. By using GPS data, the system automatically corrects
flight course deviation & maintains straight-line flight.
● Auto Return To Launch Mode (RTL) Upon activation of this Mode, the aircraft
will automatically return to the Home point, maintaining is current altitude. Upon reaching
the Home point, it will initiate auto circling.
After the aircraft back to the target point ,if the altitude greater than 100 meters , the
aircraft will down to 100 meters while circling. For the FY-41AP Lite , there is 50 meters
protection altitude for return home .If the altitude below 50 meters when activate into RTL,
the aircraft will climb to 50 meters while return.
● Auto Circling Mode On activation, the plane will maintain altitude and flight speed,
while initiating a clockwise circle. The centre of the circle is the point of activation at a
default radius of 80 meters (can be changed via FY GCS).
● GCS software By using a field computer and connecting the FY41AP Lite to an
FY Data Radio via the UART port, you can set the FY41AP Lite flight parameters, monitor
the flight progress & record / reply the flight via the FYGCS software. For more information,
please refer to the FY Data Radio manual.
NOTE:
1 ) In the navigation mode, the remote control lever (AIL ,ELE,THR,RUD) no longer can
control the aircraft except Fixed altitude & Heading lock Mode.
2 ) In Fixed altitude & Heading lock Mode, operation the throttle lever is invalid, in this
mode operation AIL,ELE,RUD lever are effective.
3) In the navigation mode, when the flight altitude below a certain altitude, the flight
speed below a certain speed, the throttle will automatically shut down.

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Page 5
2.3 OSD Video Overlay System Function
First Person View (FPV) FY-41AP Lite has an integrated OSD video overlay
system that presents critical flight information on the video for easy enjoy FPV, at the
same time, Auto stable, Fixed altitude & Heading lock, Auto Return To Home function will
make FPV operation more easy.
2.4 FY-41AP Lite Can Be Connected To A Data Link
Connecting to a Data Link can increase flight distance. Additionally, when used with
FY-GCS (Ground Control Station) system you can view telemetry data of flight conditions
and more effectively, you are able to make changes real-time including change parameter,
flight attitude etc
3. FY-41AP Lite Configuration
NO
.
Module
Introduction
1
FY-41AP Lite module
Size: 61mm*39mm*14mm
Weight: 20g
2
GPS receiver module
Size: 32mm * 32mm * 13.5mm
Weight: 24g
3
Integrated with Current Sensor and regulate voltage
module to provide stable +5V to FY-41AP Lite and
provide stable +12V to FPV video camera and
transmitter at the same time.
Size: 50mm*24mm*18mm
Weight: 35g

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4
To measure airspeed
Size: 64.5mm * 13.5mm * 13.5mm
Weight: 9g
5
For FY-41AP Lite firmware upgrade
For connect data link to PC
For connect remote adapter to PC
6
For connect FY-41AP Lite to remote receiver
7
For connect video camera or video transmitter
8
Can weld to power manager module for connect the
batter and ESC
9
GPS extension wire

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4. FY-41AP Lite Connection Summary
Z

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5. S1~S8 Servo Interface Connection
Instructions
No.
Type
Traditional
Flying wing
V tail
Airship
S1
Aileron servo 1
Aileron &Elevator
mix control servo 1
Aileron servo 1
Not use
S2
Elevator servo
Aileron &Elevator
mix control servo 2
Elevator &Rudder
mix control servo 1
Elevator servo
S3
Throttle
servo/ESC
Throttle servo/ESC
Throttle servo/ESC
Throttle
servo/ESC
S4
Rudder servo
Not use
Elevator &Rudder
mix control servo 2
Rudder Servo
S5
Aileron servo 2
Not use
Aileron servo 2
Not use
S6
Not use
Not use
Not use
Not use
S7
Not use
Not use
Not use
Not use
S8
Not use
Not use
Not use
Not use
NOTE: When using remote adapter, S7 and S8 output the channel 7 and channel 8
signal of the RC receiver directly.
6. Connection Introduction
Connection Picture
Introduction
S1～S8 servo wiring connection
Pay attention to the signal wiring
sequence
Power manager wiring
GPS module wiring

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2×4P RC receiver wiring
For FY-41AP Lite
Black Red White —— AIL
Orange —— ELE Green —— THR
Yellow —— RUD Brown —— CH5
Blue —— CH6
Airspeed sensor wiring
Video camera wiring
Yellow-video signal
Red--+12V
Black--GND
Video transmitter wiring
Yellow-video signal
Red--+12V
Black--GND
Connect the USB data cable to
UART1 port to firmware upgrade for
FY-41AP Lite control module
Connect the USB data cable to
UART2 port to firmware upgrade for
OSD module
Data link wire
Connect the FY-602 data radio to
UART1 port
Vibration absorbing pads
(dampers),use for FY-41AP Lite
vibration damping installation.

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7. Main Module Installation
7.1 FY-41AP Lite Module Installation
When installing, please keep FY-41AP Lite horizontal and
as close as possible to the "Centre of gravity" (COG) of the
aircraft. The modules orientation can be changed by FY-GCS
(Ground Control Station) system: arrow to front, back, left or
right.
Efficient anti-vibration components are very important and to be used when installing.
You can use the included ‘vibration absorbing dampers’ or your DIY equipment. Please
note: For Nitro planes, flying without using efficient ‘anti vibration dampers’, will lead to
FY-41AP Lite working abnormally.
araaa
Arrow towards to left
Arrow towards to right
Arrow towards to back
Nose of the plane
Arrow forward（Default direction）

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7.2 GPS Module Install
GPS receiver module has integrated plate type GPS
passive antenna with stronger reception ability shielding the
false signal by ground reflection efficiently. Don’t install next
to metal or carbon fiber & other shielding material, which may
block satellite signal reception. Install the GPS module
horizontal and away from electromagnetic sources such as
ESC’s, power wires, servo wires & video transmitters which can interfere with GPS signal.
7.3 Power Manager Module Install
Power manager module supports 2S～6S lithium battery
input. The integrated current sensor can measure APM draw and
voltage; DC-DC module offers 5V to FY-41AP Lite meanwhile
12V to video camera and video transmitter. But servo power is
supplied by ESC or S1~S8 any port access.
7.4 Airspeed Sensor Module Install
The airspeed sensor need to pull ahead the front of the pneumatic opening and in the
line with the direction of flight, cannot tilt. You can install the Airspeed sensor to the wing
or in the front of the nose, do not block the front of the air inlet, we can use the glue to fix
the airspeed sensor. But can't completely obturate the end of the airspeed sensor, to
maintain pressure connected with the outside world. Note: Make sure that after installation,
the fuselage in flight airflow can not interfere with air intakes.
Static Pressure Port
Dynamic Pressure Port

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7.5 Remote Control Setting: SW1&SW2
FY-41AP Lite needs remote control and receiver with at least 6 channels, including 4
normal channels for AIL,ELE,THR,RUD, and two for SW1,SW2 to control flying mode.
You need to choose normal fixed wing plane mode canceling all mix control modes,
meanwhile setting CH5,CH6 to two three-switch.
FY-41AP Lite need two three-switch to control flying mode:SW1 for deactivated mode,
stable mode, 3D mode; SW2 for return to home and fixed
attitude and head locking mode (default mode),or circle
mode(need reset).
After setting the Switch, you can double check by
monitoring the indicator light on the module against
selected flying mode. Detail please see the “FY-41AP Lite
indicator light instruction”.
SW1&SW2 default set:
NOTE: SW-2 has priority over SW-1. Only when SW-2 is in the ‘Null’Mode can SW-1
work. Therefore ‘Null’ should be one of the options for SW-2, otherwise SW-1 will not
work.
7.6 Gyroscope Reset
If the following conditions occur, the FY-41AP Lite initialization is
recommended:
1. The device has not been used for a long time.
2. There is a change in environmental temperature of over 30 degrees since last
flight.
3. The purpleLED flashes continuously even when the FY-41AP Lite remains
stationary and you never activate the motor.(When in the non navigation mode, which
means SW2 is on the position “NULL”).
Note: For the better flight, we suggest that to do the gyro reset before each flight.
There are three way to realize the gyro reset. (The FY-41AP Lite must keep stationary
during the gyro reset procedure)
SW1
SW2
Deactivated
RTL
Stable
NULL
3D
ADH

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(1) Through SW1:
On SW1, switch ABM to Deactivated Mode 6 times, time interval has to be less than 3
seconds as follows:
ABM→ Deactivated Mode → ABM → Deactivated Mode → ABM → Deactivated
Mode → ABM → Deactivated Mode → ABM → Deactivated Mode → ABM → Deactivated
Mode.
After doing this operation, the LED will bright white light about 1S.Wait for the
LED go out, then the gyro initialization finish.
(2) Through OSD video overlay menu “INIT GYRO” option.
(3) Through the “FYGCS 5.11 for 41& DOS ”setting software “Initialize the gyro”
button which in the “Autopilot Configuration Wizard”option.
(Note: Making gyro initialization via the OSD menu and the “FYGCS 5.11 for
41&DOS ”setting software, won't appear the phenomenon of the LED bright white light.)
7.7 FY-41AP Lite Indicator Light Instruction
FY-41AP Lite with three colors LED which can send out red,
blue, green light. Also yellow, white, purple and other colors light
through the combination.
Operators can know the FY-41AP Lite’s operating mode by judging the different
colors which the LED sends out and the flash frequency. Green light flash means GPS
location fixed, red and blue light indicate FY-41AP Lite working mode.

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Note: When the FY-41AP Lite needs Gyro Reset or FY-41AP Lite module is in a state
of motion, the LED will bright purple light.
e.g. Red Manual Mode, GPS not lock
Red—Red—Green Stabilized Mode, GPS lock
Purple—Purple—Green Stabilized Mode, GPS lock,
If it stay static means need Gyro Reset.
Blue—Blue—Green Fixed altitude & Heading lock Mode, GPS lock
7.8. OSD Interface Instruction
The integrated OSD module supports PAL or NTSC form video input.
OSD display interface:
No.
Instruction
No.
Instruction
1
GPS altitude(Unit: m)
10
Relative altitude (Unit: m)
2
The quantity of satellite used for
positioning
11
GPS speed (Unit: km/h)
3
Airspeed/GPS speed (Unit: km/h)
12
Flight total mileage (Unit: km)
4
The battery voltage (Unit: V)
13
Total flight time (Format:h:m:s)
5
Battery power consumed (Unit:
mA/h)
14
Current course of flight (Unit: deg)
6
Distance to Home Point (Unit: m)
15
The angle of turning to the Home Point
(Unit: deg)
7
Power battery current (Unit: A)
16
Attitude table
8
Flight mode
17
Relative position of Home Point (Icon
in the middle position when the
aircraft is around Home Point.)
9
Current latitude & longitude of the
plane (Format: dddmm.mmm)

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Flight mode instruction
Name
Introduction
Name
Introduction
RC
Deactivated mode
RTL
Return to home
3D
3DAerobatic Flight
ADH
Fixed altitude &
Heading lock Mode
ABM
Stable mode
ACM
Circle mode
8. FY-41AP Lite Setting
There are two ways to set the FY-41AP Lite, one is via remote control and OSD
overlay menu settings. Another solution is connected via USB cable to the computer by
using the setting software to set up. Here we introduce the use of these two methods.
Method one: Setting FY-41AP Lite via remote control and OSD overlay
menu
1 ) Activate the OSD setup menu: switch "ABM" to the "3D mode" 6 times in SW1,
between two switching it has to be less than 3 seconds, the process is as follows:
ABM →3D mode →ABM →3D mode →ABM →3D mode →ABM →3D mode →ABM
→3D mode →ABM→ 3D mode. This will activate OSD setup menu interface.
2 ) Move Elevator stick to the project you want to set.
3 ) Move aileron stick to the project you want to set.
4 ) Please put elevator stick to SAVE, after your setting. Through the stick of ailerons
carried out to save the action, when saving, "SAVE" will flicker for two seconds, the end
of the flashing, been saved successfully.

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NO.
Setup instructions
NO.
Setup instructions
1
Auto-control rudder surface reverse
10
Circling radius setting
2
Control gain
11
Farthest flight distance setting
3
Ailerons
12
Airspeed adjust setting
4
Elevator
13
Rudder mixing mode
5
Throttle
14
Initialize gyroscope
6
Rudder
15
Initialize airspeed sensor
7
Three-switch mode selection
16
Save the settings
8
FY-41AP Lite install setting
17
Exit the Settings interface
9
Cruising speed setting
Method two:
Setting FY-41AP Lite via “FYGCS 5.11 for 41&DOS”software
1 ) Please visit the official website: www.feiyu-tech.com. Download the newest setting
software “FYGCS 5.11 for 41&DOS”and the USB driver at the download page which
related to FY–41AP Lite products.
2 ) After successfully install the USB driver, insert the USB-TTL interface cable into
computer USB COM port(don’t connect TTL port to any other device ) , the system will
correctly identify the USB -TTL data cable, then you will find there is more than one
port(COM and LPT), the port COM6 in the “Silicon Labs CP210x USB to UART Bridge
(COM6)” is the Virtual serial number.
Inserter a few times for confirmation the virtual serial number. After that, you can use
the new USB data cable normally.
3 ) Install the software “FYGCS 5.11 for 41&DOS”. The software in addition to can use
for setting up and configuring FY-41AP Lite also included other functions. For example,
Electronic mapping, Telemetry data monitoring of flight parameters, Flight attitude, Flight
speed, Altimeter, Location, Recording and Playback of telemetry data into Ground
Control Station, Map loading ,etc .
a) Double-click “ ” installed by default.
b) After installation, double-click “ ”to open the FYGCS5.11 software,
you can see the following interface.

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Note: If you can’t open FYGCS5.11 successfully in Vista, Win7, or Win8 operating
system . Please find out executable file, right click the mouse and run as
administrator.
Please according to the picture below, through USB data cable to connect FY-41AP
Lite to PC.
Connect FY-41AP Lite to your PC, select corresponding COM port. Baud rate has to
be“19200”, click “connect” button.After FY-41AP Lite establish connection with the GCS
software successfully .Select the “Menu-> Autopilot Configuration Wizard”,you can finish
the setting in the configuration wizard. The last,you can click the button “ ”
to save the setting into the FY-41AP Lite controller.

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Step One: Installation direction setting
First you should set the correct mounting direction according to the FY-41AP Lite
mounting direction on the plane(The default setting is Arrow forward).After choose the
correct mounting direction, pitch and roll inclined the plane and checking through the
attitude chart whether the posture and aircraft state is identical.
Method one: Setting FY-41AP Lite via remote control and OSD overlay menu
Setting via the "Install Setting" option in the OSD menu.
Method two: Setting FY-41AP Lite via “FYGCS 5.11 for 41&DOS” software