FeiYu Tech FY-20A User Manual

FeiYu Tech Accessories communication

background image

GuiLin FeiYu Electronic Technology Co., Ltd http://www.feiyudz.cn E-mail: [email protected]

GuiLin FeiYu Electronic Technology Co., Ltd http://www.feiyudz.cn E-mail: [email protected] Page 1

FY-20AFlight Stabilization System

installation & operation manual

Dear Pilot,

Thank you for purchasing the FY-20A stabilizer from FeiYu Tech.In order to achieve full potential

and safe operation of this product, please carefully read this manual prior to installation.


The installation and use of this device require some skill and knowledge in flying remote
controlled fixed wing aircraft.

If you are a new to the hobby and have never flown one before, we do not recommend you
install this device on your own.

Please find assistance from an experienced flier who may provide you with the basic
knowledge required to use this device successfully.

If you are already an experienced flier, you will find the installation to be easy and logical.
Just follow the instructions as stated in this manual and you won’t go wrong.

You may e-mail us directly for assistance;

[email protected]


The FY-20A is a flight stabilizer for fixed wing aircraft based on inertial motion sensing. It utilizes

a 3-axis gyroscope and 3-axis accelerometer to control the aircraft attitude in all 3 dimensions. The unit
can be activated or de-activated via a spare channel from your receiver. Functions include:

Level flight – when you need it,the FY-20A will automatically level the flight attitude of your
aircraft. If you are just learning to fly, this will help you gain experience, log more flying time and
increase your confidence. The FY-20A can be left activated throughout the flight duration, from
take off until you landing.

Emergency Recovery – in case you lose orientation or you feel the aircraft is out of control,
activate the FY-20A via the switch and release of the control sticks. The FY-20A will automatically
bring the plane back to level flight.

Precision Flying: For experienced pilot, FY-20A can help you achieve more leveled and precise
flight paths, especially when flying and landing in strong wind.

First Person View (FPV): For long distance flying or FPV, the FY-20A will take on the job of
leveling the plane for you. Just point the plane where you want to go and enjoy the view!

System Working Principle

The Flight Stabilization System (FSS) in the FY-20A is an integrated 3-axis gyroscope and 3-axis

accelerometer. This forms a comprehensive inertial based navigation platform that calculates 3D flight
attitude using proprietary FeiYu Tech algorithm.

When activated in Balanced-Mode, the FSS detects any changes to the model’s horizontal attitude.

If attitude change is detected, the unit will send out controlling signals to the plane’s ailerons, elevator
and rudder to counter that change.

By continuously doing this, the plane is kept in a state of equilibrium, resulting in a smooth level

flight. The aircraft pitch attitude (nose up or down) is automatically controlled via the elevator, while
aircraft roll is controlled through the ailerons. Flight direction to the left or right is automatically
corrected via the rudder servo.

To achieve level flight, the pilot need only release the flight control sticks (aileron, elevator,

rudder) so that they return to the transmitter neutral (middle) position. The model will immediately
revert to level flight.

When used in the 3D-Mode, if an aircraft is in an acrobatic flight, the activated FSS will

automatically counter the rolling speed detected by the 3-axis gyros using all 3-axis controls (rudder,
aileron and elevator). The plane will therefore maintain its last attitude state.

The FY-20A can be used in any environment both indoors and outdoors, and in any weather

condition. After installation, it does not need any other initialization. Just switch on the power and your
plane can take off in stable flight.

FY-20A Package:

In each box of FY-20A, you will receive the following:

1 x FY-20A circuit board.

4 x Receiver connecting wires

2 x double-sided tape or Velcro fastener

1 x shock absorbing platform with 4 rubber bands
already installed

1 x instruction manual for FY-20A

Technical Specification and working requirements:

Input voltage

: 4.0 to 6.0 Volts

Current draw

: 52mA (5V)


: 55 x 33 x 20 mm(2.17 x 1.3 x .79 in)

Weight (excluding wires)

: 20g(.71oz)

Temperature range

:-25°C~ +70°C(-13°F~+150°F)

Maximum rate of rotation

: ≤ 1200 ° / s


The FY-20A can be installed in the following aircrafts:

Normal / Traditional fixed-wing planes


Delta-winged plane with rudder


Delta-winged plane without rudder,


Plane without aileron,


V –tail plane with aileron


V –tail plane without aileron


Any other configuration, please e-mail us for enquiry:

[email protected]

Remote Control system requirement:

The FY-20A has been tested to work with the following RC systems:

Robbe-Futaba PPM / PCM 1024 / PCM G3 mode, 2.4 GHz systems;

Graupner/JR PPM 8, PPM 12, SPCM mode;

MPX PPM8, PPM 12 with UNI mode;

Any remote control system using the standard of 1.5 ms neutral position.

FY-20A Flight Modes

a) The FY-20A can be activated to fly in 3 flight modes. You may choose these flight modes via one

free receiver channel and a 3-position switch from your computer radio:

Mode 1 : FY-20A Deactivated. In this mode, all control of the aircraft is by the pilot. FY-20A
does not participate in flight control.

Mode 2: 3D-Mode. In this mode, FY-20A will automatically recognize the latest position of
the aircraft, and give controlling signal to keep the aircraft at the last attitude upon activation
of 3D-Mode. All 3-axis will be stabilized, making your 3D acrobatic movement smoother.
However, please note that this last attitude will be kept for less than 10 seconds. Continuous
pilot input is still compulsory for safe aerobatic flying.

Mode 3: Auto balance mode. When in this mode and with your transmitter control sticks at
center, the FY-20A will continuously send out controlling signal (aileron, elevator, rudder) to
ensure the aircraft maintains its horizontal level flight attitude and stable direction. In this
mode FY-20A will not allow acrobatic flights.

b) To select the modes, set your End Points Adjustment (EPA) for the 3-Position Switch as follows:

Switch channel signal input




Functional Mode

Auto balance mode

3D mode

Stabilization OFF


You may also use a 2-position switch, at maximum and minimum End Points (EPA) to activate or
deactivate flight stabilization (therefore omitting 3D-Mode).

d) If the FY-20A does not detect any incoming signal to the Switch Channel Input, it will

automatically engage Mode 3- Auto Balance Mode. However, we DO NOT recommend flying
the unit with no signal input to the Switch Channel. It is possible that the auto balance will not
function properly if the Switch channel is left open.


We DO NOT recommend landing in Mode 2: 3D-Mode. In 3D-Mode the aircraft attitude is not
tuned for smooth landing.


Please note that the FY-20A operation does not involve the Throttle channel. The FY-20A has no
control over your aircraft Throttle. Your throttle channel should be connected directly from your
ESC to your Receiver (channel 3 for example), and operated in a safe manner.

g) Warning: The Auto Balance Mode will provide a smoother leveled landing for your aircraft.

However, note that the turning radius is much larger when FSS is activated. Please ensure your
landing area has adequate clearance for this larger radius.

Schematic diagram of stabilization control (Auto Balance Mode):


1. Remove all existing mixing function already programmed in your radio.
2. The FY20A will do all the differential mixing, not your radio.
3. Program your radio like a traditional plane layout(rudder, aileron and elevator).

FY-20A Connection Interface

The list of the pin Interface:

Gyroscope initialization (re-setting):

Out of the box, the FY-20A has been fully initialized. However, if the following conditions occur,

900-1200μs Auto balance mode

1200-1800μs 3D mode

1800-2100μs Stabilization Off