1. Introduction
This user manual provides essential information for the safe operation, assembly, and maintenance of your RC ERA C138PRO Brushless Single Rotor GPS RC Helicopter. Please read this manual thoroughly before operating the helicopter to ensure proper function and to prevent damage or injury. Keep this manual for future reference.
2. Safety Information
Operating an RC helicopter requires caution and responsibility. Failure to operate this product safely may result in injury or property damage. Always adhere to the following safety guidelines:
- Age Recommendation: This product is recommended for users aged 15 years and older.
- Flight Environment: Operate the helicopter in open, unobstructed areas, away from people, animals, buildings, and power lines. Avoid flying in strong winds (wind below level 5).
- Battery Safety: Use only the specified batteries and charging equipment. Do not overcharge or short-circuit batteries. Discontinue use if batteries show signs of damage or swelling.
- Propeller Safety: Keep hands, face, and loose clothing away from rotating propellers. Always power off the helicopter and remote controller before handling the propellers.
- Water Exposure: Do not expose the helicopter or remote controller to water or moisture.
- Supervision: Younger users should always be supervised by an adult.
3. Package Contents
Verify that all items listed below are included in your package:

Image: The RC ERA C138PRO helicopter, its remote controller, multiple batteries, spare main blades, a tail blade, a USB charging cable, a screwdriver, and a hex wrench are displayed.
- 1 x RC ERA C138PRO Helicopter
- 1 x 2.4G Remote Controller
- 1 x User Manual (this document)
- 1 x USB Charging Cable
- 2 x Main Blades (spare)
- 1 x Tail Blade (spare)
- 1/2/3/4 x Li-ion Battery (7.4V, quantity as ordered)
- 1 x Screwdriver
- 1 x Hex Wrench
4. Components Overview
4.1 Helicopter Components
The C138PRO features a robust design with advanced flight systems.

Image: A side view of the RC ERA C138PRO helicopter, highlighting its main rotor, tail rotor, fuselage, and landing skids.
- Main Rotor: Provides lift and primary control.
- Tail Rotor: Controls yaw (nose direction) and counteracts main rotor torque.
- Brushless Motor: Delivers efficient and powerful performance.
- GPS Module: Enables intelligent flight features like auto-return and stable positioning.
- Optical Flow Sensor: Enhances hovering stability, especially at lower altitudes.
- Battery Compartment: Houses the 7.4V Li-ion flight battery.
- Landing Skids: Provide stable support for takeoff and landing.
4.2 Remote Controller
The 2.4G remote controller allows for precise command of the helicopter.

Image: The RC ERA C138PRO helicopter is shown alongside its remote controller, illustrating the connection between the two.
- Left Stick (Throttle/Yaw): Controls altitude (up/down) and rotation (left/right).
- Right Stick (Pitch/Roll): Controls forward/backward and left/right movement.
- One-Key Takeoff/Landing Button: Initiates automatic takeoff or landing.
- Return-to-Home Button: Activates the GPS auto-return function.
- Speed Adjustment Button: Toggles between low, medium, and high flight speeds.
- 3D Stunt Button: Activates stunt mode for advanced maneuvers.
5. Setup
5.1 Charging the Helicopter Battery
- Connect the 7.4V Li-ion flight battery to the provided USB charging cable.
- Plug the USB charging cable into a suitable USB power source (e.g., computer USB port, USB wall adapter).
- The charging indicator light will show the charging status. Charging typically takes approximately 50 minutes.
- Once charging is complete, disconnect the battery from the charger.
5.2 Installing Remote Controller Batteries
- Open the battery compartment on the back of the remote controller.
- Insert 4 x 1.5V AA batteries (not included), ensuring correct polarity.
- Close the battery compartment securely.
5.3 Power On and Pairing
- Place the helicopter on a flat, level surface.
- Connect the flight battery to the helicopter. The helicopter's indicator lights will begin to flash.
- Turn on the remote controller. The remote's indicator light will flash.
- Push the left stick (throttle) all the way up, then all the way down. The remote and helicopter lights will become solid, indicating successful pairing.
- Allow the helicopter a few moments to acquire GPS signal (if flying outdoors). The GPS indicator will change when a signal is acquired.
6. Operating Instructions
6.1 Basic Flight Controls
- Throttle (Left Stick Up/Down): Increases or decreases altitude.
- Yaw (Left Stick Left/Right): Rotates the helicopter left or right on its vertical axis.
- Pitch (Right Stick Up/Down): Moves the helicopter forward or backward.
- Roll (Right Stick Left/Right): Moves the helicopter left or right sideways.
6.2 One-Key Takeoff and Landing

Image: The RC ERA C138PRO helicopter is shown with blue arrows indicating automatic ascent and descent, representing the one-key takeoff and landing function.
Press the One-Key Takeoff/Landing button on the remote controller. The helicopter will automatically ascend to a stable hovering altitude or descend and land gently.
6.3 Altitude Hold and Optical Flow Positioning

Image: The RC ERA C138PRO helicopter is depicted hovering, with concentric rings below it illustrating the stability provided by optical flow positioning.
The helicopter utilizes a barometric altitude sensor and optical flow positioning for enhanced stability. This allows the helicopter to maintain a consistent altitude and position, making it easier to control, especially for beginners.
6.4 GPS Functions (Auto-Return)
When flying outdoors with a strong GPS signal, the helicopter can perform intelligent return-to-home functions. Press the Return-to-Home button on the remote controller, and the helicopter will automatically fly back to its takeoff point and land.
6.5 3D Stunts and Flight Modes

Image: The RC ERA C138PRO helicopter is shown from a low angle, illustrating its capability for reverse flight mode and stunt flying.
The C138PRO supports various flight modes and 3D aerobatics. Press the 3D Stunt button to activate stunt mode, allowing for rolls, flips, and 360-degree rotations. Practice these maneuvers in open areas. The helicopter also features a one-click reverse flight mode for easier stunt flying.
6.6 Speed Adjustment

Image: The RC ERA C138PRO helicopter is shown with an overlay illustrating a three-speed adjustment slider for low, medium, and high speeds.
Use the Speed Adjustment button on the remote controller to cycle through three flight speeds: Low, Medium, and High. Select a speed appropriate for your skill level and flying environment.
6.7 Intelligent Propeller Protection

Image: The RC ERA C138PRO helicopter is shown with text indicating "Intelligent anti freeze protection" and "Intelligent anti-jamming protection" to prevent propeller damage.
The helicopter is equipped with intelligent anti-jamming protection. If the propeller encounters an obstruction and becomes blocked, it will automatically stop rotating to prevent damage to the propeller and motor, enhancing safety during operation.
7. Maintenance
Regular maintenance ensures the longevity and optimal performance of your helicopter.
- Cleaning: Gently wipe the helicopter with a soft, dry cloth after each use to remove dust and debris. Do not use water or chemical cleaners.
- Propeller Inspection: Regularly check main and tail blades for cracks, bends, or damage. Replace damaged blades immediately using the provided spare parts and screwdriver.
- Battery Care: Store batteries in a cool, dry place. Do not leave batteries fully charged or fully discharged for extended periods.
- Storage: When not in use, store the helicopter and remote controller in a safe, dry place, away from direct sunlight and extreme temperatures.
8. Troubleshooting
If you encounter issues with your RC ERA C138PRO, refer to the following common problems and solutions:
| Problem | Possible Cause | Solution |
|---|---|---|
| Helicopter does not respond to remote. | Not paired, low remote battery, helicopter battery low. | Re-pair the helicopter and remote. Replace remote batteries. Charge helicopter battery. |
| Helicopter cannot take off or flies unstably. | Damaged propellers, insufficient power, uneven surface for takeoff. | Check and replace damaged propellers. Ensure battery is fully charged. Take off from a flat, level surface. |
| Short flight time. | Battery not fully charged, old battery, aggressive flying. | Ensure battery is fully charged. Consider replacing old batteries. Fly more conservatively. |
| GPS functions not working. | No GPS signal, flying indoors. | Ensure flying outdoors in an open area. Wait for GPS signal acquisition. |
9. Specifications
| Feature | Detail |
|---|---|
| Model | C138PRO |
| Description | 3D Six-Axis Single-Rotor RC Helicopter (Brushless Intelligent GPS Version) |
| Material | PA / PC |
| Main Rotor Diameter | 306mm |
| Fuselage Length | 312mm |
| Height | 101mm |
| Scale | 1/33 |
| Flight Weight | 110g |
| Flight Time | 8-10 minutes |
| Charging Time | Approximately 50 minutes |
| Remote Control | 2.4G Transmitter |
| Remote Distance | 80-100m |
| Channels | 2 |
| Helicopter Battery | 7.4V Li-ion |
| Transmitter Battery | 4 x 1.5V AA (not included) |
| Recommended Age | 15 years and up |
| Product Dimensions | 12.28 x 12.05 x 3.98 inches |
| Item Weight | 1.93 pounds |
10. Warranty and Support
For warranty information, technical support, or replacement parts, please refer to the contact information provided with your purchase or visit the manufacturer's official website. Keep your proof of purchase for warranty claims.