1. Introduction
This manual provides detailed instructions for the installation, configuration, and operation of the HobbyEagle A3 Pro and A3 Pro V2 6-Axis Gyro RC Flight Controller Stabilizer Systems. These high-performance units are designed to enhance the stability and control of your R/C airplanes, making flying easier and more enjoyable. Please read this manual thoroughly before using the product to ensure safe and optimal performance.
2. Key Features
2.1. HobbyEagle A3 Pro Flight Controller
- 32-bit MCU and high-precision 6-axis MEMS sensor for reliable performance.
- 6 flight modes: Gyro-Off, Normal, Trainer, Atti-Lock, Auto-Level, and Auto-Hover.
- Supports 3 wing types: standard fixed-wing, delta-wing (flying-wing), and V-tail.
- Compatible with standard receivers, standard PPM single-line receivers, and Futaba S.Bus/S.Bus 2 receivers.
- Separated basic gain adjustment for aileron, elevator, and rudder.
- Remote master gain support.
- Sub Trim and Travel Limit settings.
2.2. HobbyEagle A3 Pro V2 Flight Controller
The A3 Pro V2 builds upon the A3 Pro with enhanced multi-protocol serial receiver support, simplifying receiver connections.
- Supports PPM Receiver, Futaba S.Bus (compatible with FrSky SBUS, RadioLink SBUS, WFLY WBUS), Spektrum DSM/DSMX 1024/2048 Satellite Receiver, Spektrum SRXL, Multiplex SRXL / JR XBUS Mode B, Graupner SUMD, and FlySky iBus.
- Compatible with most standard PWM receivers, PPM, and multi-protocol digital serial receivers.
- 32-bit MCU and high-precision 6-axis MEMS sensor for reliable performance.
- 6 flight modes: GYRO OFF, NORMAL, LOCK, ANGLE, LEVEL, and HOVER.
- Supports 3 wing types: standard fixed-wing, delta-wing (flying-wing), and V-tail.
- Separated basic gain adjustment for Aileron, Elevator, and Rudder.
- Remote master gain support.
- Firmware upgradable (optional data cable required).
3. Package Contents
Figure 3.1: Typical package contents including the flight controller, connection cables, and mounting tape.
- HobbyEagle A3 Pro or A3 Pro V2 Flight Controller
- Connection Cables (various lengths)
- Double-sided Mounting Tape
- User Manual (digital version available via PDF link)
4. Specifications
| Attribute | Value |
|---|---|
| Brand Name | HobbyEagle |
| Model Number | HobbyEagle A3 Pro / A3 Pro V2 |
| Quantity | 1 pcs |
| Is Electric | No Battery |
| Material | Composite Material |
| For Vehicle Type | Airplanes |
| RC Parts & Accs | Flight Controller |
| Upgrade Parts/Accessories | Flight Controller |
| Remote Control Peripherals/Devices | A3 Pro V2 |
| Recommend Age | 14+y |
| Origin | Mainland China |
5. Setup and Connection
5.1. Mounting the Flight Controller
- Mount the A3 Pro/A3 Pro V2 firmly to the airframe using the provided double-sided tape.
- Ensure the controller is mounted horizontally and parallel to the main axis of the aircraft.
- The arrow on the controller should point towards the nose of the aircraft.
- Avoid mounting near sources of vibration or electromagnetic interference.
5.2. Standard Receiver Connection (A3 Pro)
For standard PWM receivers, connect the receiver outputs to the corresponding inputs on the A3 Pro.
Figure 5.1: Standard Receiver Connection Diagram for A3 Pro.
| Input Channel (Receiver) | Description | Output Channel (A3 Pro) | Description |
|---|---|---|---|
| AIL | To Aileron Channel Of The Receiver | OUT1 | To Aileron Servo |
| ELE | To Elevator Channel Of The Receiver | OUT2 | To Elevator Servo |
| RUD | To Rudder Channel Of The Receiver | OUT3 | To Rudder Servo |
| MOD | Flight Mode Control Channel | ||
| PPM/Bus/G | Remote Master Gain Control; PPM or S.BUS Input Channel When Using A Single-line Receiver |
5.3. Serial Receiver Connection (A3 Pro V2)
The A3 Pro V2 supports various serial receiver protocols, simplifying wiring. Connect your serial receiver to the "Serial RX/G" port.
Figure 5.2: Serial Receiver Connection Diagram for A3 Pro V2.
When operating in PPM or Serial Receiver Mode, the "THR Out/AIL" port provides the throttle channel output for the ESC or throttle servo.
| Serial Receiver Protocol | AIL | ELE | THR | RUD | MODE | GAIN |
|---|---|---|---|---|---|---|
| PPM Receiver | CH1 | CH2 | CH3 | CH4 | CH5 | None |
| Futaba S.Bus/FrSky SBUS or WFLY WBUS | CH1 | CH2 | CH3 | CH4 | CH5 | None |
| Spektrum DSM/DSMX 1024 Satellite | CH2 | CH3 | CH1 | CH4 | CH5 | None |
| Spektrum DSM/DSMX 2048 Satellite | CH2 | CH3 | CH1 | CH4 | CH5 | None |
| Spektrum SRXL | CH1 | CH2 | CH3 | CH4 | CH5 | None |
| Multiplex SRXL / JR XBUS Mode B | CH1 | CH2 | CH3 | CH4 | CH5 | None |
| Graupner SUMD | CH1 | CH2 | CH3 | CH4 | CH5 | None |
| FlySky iBus | CH1 | CH2 | CH3 | CH4 | CH5 | None |
6. Operating Modes
Both A3 Pro and A3 Pro V2 offer 6 distinct flight modes to suit various flying styles and conditions. These modes are typically selected via a switch on your transmitter connected to the Flight Mode Control Channel (MOD).
- Gyro-Off Mode (GYRO OFF): The flight controller's stabilization functions are completely disabled. The aircraft responds directly to pilot inputs.
- Normal Mode (NORMAL): Provides basic stabilization, assisting in maintaining level flight and counteracting external disturbances like wind.
- Trainer Mode: (A3 Pro specific) Offers enhanced stability and limits control surface throws, ideal for beginners.
- Atti-Lock Mode (LOCK): (A3 Pro V2 specific) Locks the aircraft's attitude (pitch and roll) at the last commanded position, providing a very stable platform.
- Auto-Level Mode (ANGLE/LEVEL): Automatically levels the aircraft when control sticks are released, preventing extreme attitudes.
- Auto-Hover Mode (HOVER): (A3 Pro specific) Attempts to maintain a stable hover, useful for specific maneuvers or VTOL aircraft.
Refer to the full user manual for detailed calibration and configuration of each mode.
7. Maintenance
- Physical Inspection: Regularly check the flight controller and its connections for any signs of damage, loose wires, or wear.
- Mounting Security: Ensure the double-sided tape is still securely holding the unit and that there is no excessive vibration.
- Firmware Updates: Check the HobbyEagle website periodically for firmware updates for your specific model (A3 Pro V2 is upgradable with an optional data cable). Follow update instructions carefully.
- Environmental Protection: Keep the flight controller away from moisture, extreme temperatures, and direct sunlight.
8. Troubleshooting
- No Response from Controls:
- Check all wiring connections between the receiver, flight controller, and servos.
- Ensure the receiver is powered and bound to the transmitter.
- Verify correct channel assignments in your transmitter and flight controller settings.
- Unstable Flight / Erratic Behavior:
- Confirm the flight controller is mounted securely and correctly oriented (arrow pointing forward).
- Check for excessive vibrations in the airframe.
- Adjust gain settings. Start with lower gains and gradually increase until desired stability is achieved without oscillation.
- Recalibrate the gyros if necessary.
- Incorrect Flight Mode Operation:
- Ensure the flight mode control channel (MOD) is correctly assigned and calibrated on your transmitter.
- Verify the switch positions correspond to the desired flight modes.
- LED Indicator Issues:
- Refer to the full user manual for specific LED status indications and their meanings.
- A blinking LED often indicates a calibration requirement or an error state.
9. User Tips
- Start with Low Gains: When first setting up, always begin with conservative (low) gain settings and gradually increase them during test flights to avoid over-correction and oscillations.
- Secure Wiring: Use cable ties or electrical tape to secure all wiring, preventing them from interfering with moving parts or causing disconnections due to vibration.
- Test Flight Environment: Perform initial test flights in a calm, open area with plenty of space, especially when experimenting with new settings or modes.
- Read the Full Manual: For advanced configurations, detailed calibration procedures, and specific troubleshooting steps, always consult the comprehensive PDF user manual.
10. Support & Resources
For the most comprehensive and up-to-date information, including detailed setup guides, calibration procedures, and advanced settings, please refer to the official HobbyEagle user manual.
Official User Manual (PDF): HobbyEagle A3ProV2 User Manual v1.0 (English)
For further assistance, please contact HobbyEagle customer support or visit their official website.
