FeiYu Tech FY-90Q User Manual

FeiYu Tech Accessories communication

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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]

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FY-90Q QuadCopter Controller

Flight Stabilization System

Installation & Operation Manual

Dear Pilot,

Thank you for purchasing the FY-90Q QuadCopter 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 Quadcopters (or

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

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

If you are already an experienced Quad pilot, you will find the installation to be easy and logical.

Just follow this manual and you won‟t go wrong.

You may e-mail us directly for assistance

; [email protected]


The FY-90Q controller is specially designed for QuadCopter use.
The Attitude Flight Stabilization System (AFSS), which is the heart of the FY-90Q, is an integrated
3-axis gyroscope and 3-axis accelerometer. AFSS forms a comprehensive inertial based navigation
platform that calculates 3D flight attitude using proprietary FeiYu Tech algorithm.
When in Full Balanced-Mode (Mode 1), the AFSS detects any changes to the model's horizontal attitude.

If attitude change is detected, the unit will send out controlling signals to change the Quad‟s four motor
speed to maintain stability and balance.

FY-90Q Package:

In each box of FY-90Q, you will receive the following:

1 x FY-90Q circuit board.

1 x Receiver connecting wires

2 x double-sided tape or Velcro fasteners

1 x shock absorbing platform with 4 damper bands
already installed

1 x instruction manual for FY-90Q

Technical Specification and working requirements:

Input voltage : 4.0 to 6.0 Volts
Current draw : 52mA (5V)
Size : 55 x 33 x 20 mm
(2.17 x 1.3 x .79 in)

The FY90Q supports two flight formats, “Cross” and “X” (see section on Flight Format).
The pulse signal output to control ESCs is between 900-2100μs PPM pulses.


ESCs with Fast response rates are recommended, as too slow response will result in failure to
maintain Quad flight stabilization and control.

Do not use ESCs that do not have manually settable throttle endpoints. All endpoints MUST be
manually matched.

Do not use ESCs that lose their throttle endpoint settings at each power off (e.g. Castle Thunderbird

Do not use ESCs that must be "armed" before you can set the throttle endpoints (e.g. Castle
Thunderbirds). With this ESC type, you must power up all motors and go to full throttle to set the

From our tests, we highly recommend ESCs such as those from ALIGN; throttle endpoints can be set
manually before arming, fast throttle response capability and 200 step throttle resolution. Please
source for ESCs of such ability.

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

[email protected]

Remote Control system requirement:

The FY-90Q 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-90Q Flight Modes

The FY-90Q supports two Flight Modes. Selection of Flight Modes is via a free channel on your

Mode 1: Full Balance Mode: in this mode, the Quad flight is fully stabilized on all 3 axis, resulting in
extremely leveled flight. Suitable for aerial photography, videography, FPV and beginner quad

Mode 2: Aerobatics Mode: In this flight mode, the controls to the Quad motors are very responsive.
Specifically for skilled Quad pilots for sports flying, fast forward flights (FFF), stunts, etc.

Switch Settings for Mode Selection:

To select the modes, set your End Point Adjustment (EPA) for the 2-Position Switch as follows:

Switch channel signal input



Functional Mode

Full balance mode

Aerobatics Mode

Gyroscope initialization (re-setting):

Out of the box, the FY-90Q has been fully initialized. However, if the following conditions occur,
re-setting and initialization is recommended:

The device has not been used for a long time.


There is a change in environmental temperature of over 30 degrees.


During initialization, do not move the FY-90Q module for at least 20 seconds. If during the
initialization, the blue LED flashes, that means movement occurred and you will need to initialize
the gyro again.


Carry out this re-setting procedure only if any of the three conditions (above) occur. We do not
recommend regular scheduled re-setting.
It is NOT necessary and NOT recommended.

The stabilizer unit does not need to be in a horizontal position during initialization. However, you
must ensure there is no vibration during this process. If you suspect shaking had occurred, just
restart the initialization process.

Initialization / Reset Procedure


Install the jumper as shown in this picture:


Power-ON the FY-90Q and keep it stationary for at least
20 seconds. You will notice the red light blink with two
different rates.


After 20 seconds the re-setting / initialization is


Disconnect the power, unplug the jumper and remove
(keep it in a safe place for future use).

FY-90Q Connection Interface

The list of the pin Interface:


a) FY-90Q Power Supply

Note the pin diagram of the FY-90Q:

The red line indicates the internal common connection for
VCC (positive). Black circles indicate the internal common
Ground (GND).

The FY-90Q can safely operate between 4 to 6 volts input.

If your ESC has an internal BEC, you can supply power to
the FY90Q and Receiver via any of the ESC connection (ESC 1 to ESC 4).

VERY IMPORTANT: Only one BEC power source should be used. If all four ESCs have
internal BEC, choose only one to supply power. Disconnect the red wire (positive) of the other 3

b) Connection between the FY-90Q and RC Receiver output is via this supplied wire. Note the

wires are colour coded:


FY-90Q requires a minimum of 5-channel RC receiver..

d) 4 Receiver channels are used; Aileron (Channel 1), Elevator (Channel 2), Throttle (Channel 3) and

Rudder (Channel 4). Connect this 4 receiver outputs to the FY-90Q with the supplied wires (Note
each channel is colour coded


1 Receiver channel (e.g. Channel 5) is required to control the FY-90Q working modes via a
2-position switch.


a) Like all accelerometer devices, the FY-90Q is vibration-sensitive. To optimize its stabilization

capability, vibrations reaching the unit must be kept at minimum.

b) Therefore we highly recommend that you install it with the supplied vibration damper mount.

The algorithm in the FY-90Q compensates for normal levels of flight vibration. However, if the
vibration experienced by the unit exceeds the acceptable level, it will NOT work normally or may
even stop working altogether.

d) To keep vibration at a minimum, install the FY-90Q away from the engine or any other vibration



Use the supplied Velcro strips to mount the FY-90Q onto the suspended platform (below).


Mount the entire unit to the plane using double sided tape (recommended), Velcro, screws or glue.

Aerobatics Mode

Full Balance Mode

Weight (excluding wires) : 20g (71oz)
Temperature range :-25°C~+70°C


Maximum rate of rotation : ≤ 500 ° / s