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  • Better performance with the latest firmware V2.0 in 2018.
  • 3 Flight Modes: Normal, 3D AVCS and Gyro Off Mode.
  • Standard wing type, Delta-wing and V-tail.
  • Remote Master Gain.
  • Servo Frequencies: 50Hz/125Hz/250Hz;
  • Separated gain adjustment for each flight mode.
  • Automatic stick centering.
  • HV (8.4V) operating voltage supported.
  • Futaba S.Bus / S.Bus 2 supported.
  • Easy to use, extremely well-suited to beginners.

The new firmware update V2.0 includes an important improvement for AVCS mode, and also provides an advanced gyro gain drop algorithm for superior performance. The user manual V1.0 is still applicable to the new firmware.

After installing the gyro, the servos will move more frequently than before, it is highly recommended that a reliable UBEC or ESC be used to provide sufficient working current for the servos on the plane, otherwise the gyro may become unstable by an occasional voltage drop. A large capacitor (3300uF/16V) can be used to get a more stable and secure voltage level. You just need to simply plug it into any open slot of the gyro or the receiver.

Flight Mode

A3L Supports 3 flight modes, you can switch between them using a 3-way switch on the transmitter. But if you are using a 2-way switch instead then you can only use 2 of them during flight. The color of the LED shows you that the flight mode currently selected, as shown below.

  Flight Mode Switch Position Color of LED Description
1 Normal Mode POS-1 Blue Normal Stabilization Mode
2 Gyro Off Mode POS-2 (Middle)) Off Gyro deactivated mode
3 3D AVCS Mode POS-3 Red AVCS Mode designed for 3D flight


Normal Mode

Normal mode is the most basic application of the gyro. In this mode, the gyro will sense angular velocity on each axis and make a momentary reaction. The normal mode is suitable for all types of fixed-wings, it can effectively improve the stability of your plane specially on a windy day.

Gyro Off Mode

Choose this mode to disable the gyros for all channels. The plane will be completely under the control of the radio. The plane will go back to its previous performance when operating it in this mode. Usually it is only used to test.

3D AVCS Mode

The AVCS mode is an advanced application of the gyro. By adding an integral algorithm to the gyros, the controller will try to lock the plane to its previous attitude if there is no command sent from the transmitter in a flight. This mode can effectively help you to accomplish such hard actions as hover and knife edge. But this mode is designed especially for the 3D planes, it's not suitable for the planes those not designed for 3D flight.


Installation Cases

The new A3 series can be attached flat or upright, to maximize the use of space for your plane.



Caution Notes

  • Please confirm the 13-bit unique product series number (S/N) on the bar code label when purchasing. This number can be verified at our website and it is also required in the after-sale service, please keep it securely!
  • Before power on, put the aileron, elevator and rudder sticks in the middle position. The controller needs to perform self-calibration and stick centering after you plugging the battery, the LED will keep blinking Blue rapidly for about 3 seconds while calibrating, just don't move the plane and the sticks until the initialization is done.
  • It's extremely important to verify that the gyro reacts in the correct direction before flight, or it could lead to losing control or even crash during flight!
  • You need to restart the gyro after changing the receiver type to make new setting take effect.
  • Never use the delta-wing or V-tail mixing functions of your transmitter.
  • The new A3 series supports a wide working voltage from 5 to 8.4V, HV receivers or servos can be used directly.
  • The radio control models are not toys. The propellers rotate at high speed and pose potential risk, please carry out debugging and flying in open space far away from the crowd. The beginner should be directed by someone experienced.



  • Input Voltage: 5 to 8.4V
  • Servo Travel: 1520 ± 500μs
  • Gyroscope: ± 2000dps
  • Operating Temp: -40 ℃ ~ 85 ℃
  • Size: 43 × 27mm
  • Weight: 11 g


Port Description

The new A3 series provides 5-channel inputs and 3-channel outputs. You only need to connect the receiver and servos to the corresponding pins on the side of the gyro. The knobs are used to adjust the gain for each flight mode, clockwise for increase, anticlockwise for decrease. Futaba's S.Bus and S.Bus 2 are supported by new A3 series now.


Standard Receiver

If a standard receiver is being used, you just need to connect the corresponding channels to the pins AIL, ELE, RUD, MOD and GAIN using the included receiver wires. The aileron, elevator and rudder should be always connected or it could not work. The MOD is used for flight mode control, if you don't connect it the flight mode will be set to normal as the default. The GAIN is used to adjust the master gain remotely. If you don't connect it the gain will be set to 100% all the time as the default. Wiring is as shown in the figure below.


Futaba S.Bus

The Futaba's S.Bus/S.Bus 2 is also supported by A3. Because the S.Bus is a single-line solution all channels are transmitted via one single line you need to establish the first 6 channels in the correct order in your transmitter before use. Here we use a R7008SB receiver as an example because it supports both S.Bus and S.Bus 2. You need to change the mode for the R7008SB before using its S.Bus outputs, please refer to the manual of it.


The gyro must be firmly mounted on the platform of the airframe by using the provided double-sided tape, as close to the CG as possible. The gyro can be attached flat or upright. However, the servo connector pins must always point toward the rear of the plane (the shorter side with the setting button must always point toward the heading direction). There're 4 mounting orientations supported, as shown below.



Setting Menu

Press and hold down the button for more than 2 seconds (long press), release it when the LED starts to blink Blue&Red rapidly. In the setting menu, the LED should be blinking Blue&Red for N times in a loop with the sequence by the chart below. N stands for the number of the setting function.




When you reach the function that you wish to operate in, quickly press the button once (short press) to enter it.



After entering a function, the color of the LED shows you the settings currently selected. Each short press of the button advances the option to the next value. When you finish making your selections, just wait for 5 seconds then system will save the modified and back to the setting menu automatically. The colors corresponding to the options for each parameter are as shown in the chart above. (* is the default setting).


Exit Setting Mode

When back to the menu, long press the button again to exit the setting mode.


Stick Centering

A3-L will perform a stick centering automatically every time it starts, so a manual centering is no longer needed. You just need to keep all the sticks ( except for the throttle) in their middle position before power on the gyro, and don't move them while initializing. If the servos drift to one side slowly when switching to 3D mode, you can easily perform a centering by fast toggling the mode switch twice within 1 sec, it has the same effect as if you restart it.


Device Reset

Press and hold the button while power on the gyro, you will see both Blue and Red LED turn on. Keep holding the button for more than 4 seconds and don't release it until you see the LED flashes Blue & Red twice, which indicates that all the settings have been restored to the factory default.


Gain Adjustment

There are 2 knobs on the gyro (GAIN1 and GAIN2), they are used to adjust the gyro gain for each flight mode separately. Clockwise for increase, anticlockwise for decrease. The gain is affected by many factors there is no standard answer to that how much it should be. You need to fine-tune to get the best result during flights. We suggest you always start with a lower volume for the first flight and then increase it gradually. The normal gain (Basic Gain) (GAIN1) will take effect in all flight modes, it's the most basic feature of the gyro, don't turn it to 0% anyway.


Remote Master Gain

The GAIN is used to control the master gain remotely. You can make a linear adjustment by using a knob or slider on your transmitter, or make a 3-level gain control using a 3-way switch. The master gain is just an optional channel that the gyro can still work properly without connecting this channel.


The package contains 4 receiver wires and 2 pieces of double-sided tapes.


Feature Comparison of A3 Series

 对比项目 A3 Super II A3 Super A3 (V2) A3-L (V2) A3 Pro SE
 Sensor 6-axis 6-axis 6-axis 3-axis 3-axis
 MCU 32-bit 8-bit 8-bit 8-bit 8-bit
 Input Channels 7 6 5 5 4
 Output Channels 5 5 3 3 3
 Flight Mode
 Gyro Off Mode
 Normal Mode
 3D AVCS Mode  
 Auto-balance Mode    
 Auto-hover Mode      
 User-defined Mode        
 Gain Adjustment
 Gain adj. for each Flight Mode  
 Gain adj. for each Channel    
 Remote Master Gain  
 Gain Rate    
 Stick Control Mode        
 Dual Aileron      
 Dual Elevator      
 Delta-wing, V-tail
 Standard Receiver
 Futaba S.Bus/S.Bus 2    
 H.V. (7.4V)   Since H/W V1.1
 Setting Mode PC / Program Card PC / Program Card Button Button Button
 Response Rate      
 Servo Frequecy 50/65/165/200/270/333Hz 50/63/83/125/250Hz 50/125/250Hz 50/125/250Hz 50/133Hz
 Travel Limit      
 Stick Deadband      
 Firmware Update