Introduction
This manual provides essential instructions for the safe operation, setup, and maintenance of your ROUASD RC ERA C138PRO Bell 206 RC Helicopter. Please read this manual thoroughly before operating the helicopter to ensure proper function and to prevent damage or injury. The C138PRO is a 1/33 scale 6-channel RC helicopter featuring a 6-axis gyroscope, flybarless design, optical flow positioning, and advanced 3D flight capabilities.

Image: The ROUASD RC ERA C138PRO Bell 206 RC Helicopter, showcasing its blue and white design with "POLIS" markings.
Safety Information
Operating remote-controlled aircraft requires caution. Failure to follow safety guidelines can result in injury or property damage.
- Always fly in open areas: Ensure there are no obstacles, people, or animals nearby. Maintain a safe distance from crowds, buildings, and power lines.
- Weather conditions: Avoid flying in strong winds, rain, or snow. Optimal flight conditions are calm and dry.
- Battery safety: Use only the provided charger and batteries. Do not overcharge or short-circuit batteries. Disconnect batteries when not in use.
- Rotor blades: Keep hands, face, and loose clothing away from rotating blades. Blades can cause serious injury.
- Adult supervision: This product is recommended for adults. If used by younger individuals, adult supervision is required.
- Pre-flight check: Before each flight, inspect the helicopter for any damage, loose parts, or obstructions. Ensure batteries are fully charged and securely installed.
- Emergency stop: Familiarize yourself with the emergency stop function on the remote control.
Package Contents
Verify that all items are present in your package:
- RC ERA C138PRO Helicopter (1)
- Remote Controller (1)
- User Manual (1)
- USB Charging Cable (1)
- Main Blades (2)
- Tail Blade (1)
- Li-ion Battery (Quantity may vary based on purchase: 1, 2, 3, or 4)
- Screwdriver (1)
- Hex Wrench (1)
Setup
1. Battery Installation
Helicopter Battery:
- Locate the battery compartment on the helicopter.
- Insert the Li-ion battery into the compartment, ensuring correct polarity.
- Secure the battery and close the compartment cover.
Remote Controller Batteries:
- Open the battery cover on the back of the remote controller.
- Insert four (4) 1.5V AA batteries (not included), observing the correct polarity (+/-).
- Close the battery cover securely.
2. Charging the Helicopter Battery
Use the provided USB charging cable to charge the helicopter's Li-ion battery.
- Connect the USB charging cable to a USB power source (e.g., computer, USB wall adapter).
- Connect the other end of the cable to the helicopter battery.
- The charging indicator light will show the charging status (refer to charger instructions for specific light behavior).
- Charging time is approximately 50 minutes. Do not leave charging unattended.
3. Binding the Helicopter and Remote Controller
Follow these steps to establish a connection between the helicopter and the remote controller:
- Ensure both the helicopter and remote controller batteries are charged.
- Place the helicopter on a flat, level surface.
- Turn on the helicopter's power switch. The indicator lights will flash.
- Turn on the remote controller.
- Push the throttle stick (left joystick) all the way up, then all the way down.
- The helicopter's indicator lights will stop flashing and remain solid, indicating a successful binding.
Operating Instructions
Remote Control Guide

Image: Diagram of the RC ERA C138PRO remote control, labeling the power indicator light, emergency stop, speed key, up/down throttle, rotate left/right, pitch adjustment, one-key takeoff, one-key landing, forward/backward, left/right fly, and fine-tuning controls.
- Up and Down Throttle (Left Joystick): Controls altitude and rotation.
- Forward and Backward (Right Joystick): Controls forward and backward movement.
- Left and Right Fly (Right Joystick): Controls sideways movement.
- Pitch Adjustment: Fine-tunes the helicopter's pitch.
- Fine-tuning: Adjusts trim for stable flight.
- Speed Key: Cycles through different flight speeds (Low, Medium, High).
- Emergency Stop: Immediately cuts power to the motors. Use only in emergencies.
Basic Flight Functions
One-Key Takeoff and Landing:

Image: The RC ERA C138PRO helicopter demonstrating one-key takeoff (upward arrows) and landing (downward arrows), highlighting barometric altitude, brushless motor, and 12-minute endurance.
- After binding, press the "One-Key Takeoff" button. The helicopter will automatically ascend to a stable hovering altitude.
- To land, press the "One-Key Landing" button. The helicopter will descend and land automatically.
Speed Adjustment:

Image: A diagram illustrating the three-speed adjustment settings (Low, Medium, High) for the RC ERA C138PRO helicopter, with an inset showing the speed key on the remote control.
- Press the "Speed Key" on the remote control to cycle between Low, Medium, and High-speed modes.
- Low speed is recommended for beginners and indoor flight.
- Medium and High speeds offer increased agility and are suitable for experienced pilots and outdoor flight.
3D Stunts and Inverted Flight:

Image: The RC ERA C138PRO helicopter in a reverse flight mode, with text indicating "One click reverse flight mode makes stunt flying easier."

Image: Diagrams illustrating various stunt maneuvers for the RC ERA C138PRO, including "Pot scrubbing stunt (circling flight)" and "One key reverse flight."
- The C138PRO supports one-touch inverted flying and advanced 3D maneuvers.
- To activate 3D mode, switch from 6G stabilization mode (beginner-friendly) to 3D mode using the designated button on the remote (refer to remote diagram).
- Practice these maneuvers in a spacious, open area, away from obstacles.
- For one-click reverse flight, push the throttle stick upwards and pull the left and right flight joysticks simultaneously.
Core Technical Functions Overview

Image: An iconographic representation of the RC ERA C138PRO's core technical functions, including pressure constant height, one-key reverse flight, brushless motor, easy to maintain, high-fidelity modeling, one-key takeoff and landing, three-speed adjustment, ailerless design, modular battery, multi-directional flight, optical flow positioning, and easy to modify.
- Pressure Constant Height (Barometric Altitude Hold): Maintains a stable altitude automatically, simplifying flight control.
- Optical Flow Positioning: Enhances stability and precise hovering, especially in indoor environments.
- 6-Axis Gyroscope: Provides superior stability and control, making the helicopter easier to fly.
- Brushless Motor: Delivers powerful and efficient performance for extended flight times and robust maneuvers.
- Flybarless Design: Improves aerodynamic efficiency, stability, and responsiveness.
Official Product Video
Video: An official product video demonstrating the RC ERA C138PRO Bell 206 RC Helicopter in flight, showcasing its maneuverability and features. This video is provided by ROUASD TOY.
Maintenance
- Cleaning: Gently wipe the helicopter with a soft, dry cloth after each use to remove dust and debris. Avoid using water or chemical cleaners.
- Blade Inspection: Regularly check main and tail blades for cracks, bends, or damage. Replace damaged blades immediately using the provided spare parts and tools.
- Motor Care: Keep the brushless motor free from obstructions. Avoid prolonged operation in dusty environments.
- Battery Storage: Store batteries in a cool, dry place, away from direct sunlight and extreme temperatures. For long-term storage, charge batteries to approximately 50% capacity.
- Component Check: Periodically inspect all screws and connections to ensure they are secure. Tighten any loose parts with the provided screwdriver or hex wrench.

Image: A close-up view of the RC ERA C138PRO helicopter's tail, showing the signal lights illuminated, indicating high brightness and strong penetration for night flight.
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Helicopter does not respond to remote. | Not bound, low battery (helicopter or remote), remote off. | Ensure binding process is complete. Charge batteries. Turn on remote. |
| Helicopter cannot take off or lacks power. | Low helicopter battery, damaged blades, motor issue. | Charge helicopter battery. Inspect and replace damaged blades. Contact support if motor issue persists. |
| Helicopter drifts or is unstable. | Improper trim adjustment, strong wind, damaged gyroscope. | Adjust fine-tuning/trim on remote. Fly in calm conditions. If issue persists, contact support. |
| Blades do not spin. | Obstruction, motor connection issue, emergency stop engaged. | Check for obstructions. Ensure all connections are secure. Disengage emergency stop. |
Specifications
| Parameter | Detail |
|---|---|
| Model | C138PRO |
| Type | 3D Six-Axis Single-Rotor RC Helicopter (Brushless Intelligent GPS Version) |
| Material | PA / PC (Acrylonitrile Butadiene Styrene (ABS)) |
| Scale | 1/33 |
| Main Rotor Diameter | 306mm |
| Fuselage Length | 312mm (12.28 inches) |
| Height | 101mm (3.98 inches) |
| Flight Weight | 110g |
| Flight Time | 8-10 minutes |
| Charging Time | Approximately 50 minutes |
| Remote Control Frequency | 2.4G |
| Remote Distance | 80-100m |
| Channels | 6 |
| Helicopter Battery | 7.4V Li-ion |
| Transmitter Battery | 4*1.5AA (not included) |
| Age Range | Adult (192 months and up) |
Warranty and Support
For warranty information, technical support, or replacement parts, please contact the seller or manufacturer directly. Refer to your purchase documentation for specific contact details.
Manufacturer: ROUASD