Radiolink Byme-A Flight Controller for Fixed-Wing Aircraft

Instruction Manual

Introduction

Thank you for purchasing the Radiolink flight controller Byme-A. To fully enjoy the benefits of this product and ensure safety, please read this introduction carefully and set up the device as described below. If any problems are found during the operation process, please refer to the manual first. Pilots can contact our distributors for solutions or follow our Facebook homepage Radiolink to search for related keywords. Pilots can also send questions to afterservice@radiolink.com.cn or afterservice1@radiolink.com.cn, and we will answer your questions at the earliest. Due to unforeseen changes in production procedures, the information contained in this manual is subject to change without notice. For more information, please check our website www.radiolink.com and follow our Facebook and YouTube homepages.

The Byme-A is a flight controller applicable to various straight-wing aircraft, including 3D fixed-wing (F3P), 4-channel trainer, and scale model aircraft. It supports SBUS and PPM signals. With its three-axis gyroscope, three-axis acceleration sensor, full attitude algorithm, control algorithm, and digital filter, the Byme-A makes flying much easier. There are five flight modes: Vertical Mode, Stabilize Mode, Gyro Mode, Acro Mode, and Manual Mode.

Safety Precautions

Never operate the model during adverse weather conditions. Poor visibility can cause disorientation and loss of control of the pilot's model.
Never use this product in a crowd or illegal area.
Always ensure the trim levers are at 0 and the battery is properly charged before connecting the receiver.
Always check all servos and their connections prior to each run.
Always be sure to turn off the receiver before the transmitter.
To ensure the best radio communication, please enjoy the flight/driving in spaces without interference, such as high-voltage cables, communication base stations, or launching towers.

Warning

This product is not a toy and is NOT suitable for children under the age of 18. Adults should keep the product out of the reach of children and exercise caution when operating this product in the presence of children.

Water or moisture may enter the transmitter inside through gaps in the antenna or joystick and cause model instability, even loss of control. If running in wet weather (such as a game) is inevitable, always use plastic bags or waterproof cloth to cover the transmitter.

Parameters

Input Voltage: 6-12V
Pin: 2.54mm * 3 pin * 5
Weight: 4.5 g (with wires)
Dimension: 35.5 * 15.5 * 10.5 mm

Installation

Make sure the arrow on Byme-A points towards the aircraft's head. The flight controller can be installed either face up or down with 3M glue on the aircraft body (preferably around the center). Connect the wires to the corresponding pins.

Component Identification:

S.BUS/PPM Input: Connects to the receiver for SBUS or PPM signal input.
CH1: Aileron control.
CH2: Elevator control.
CH3: Throttle control.
CH4: Rudder control.
Button: Servo phase adjustment.
Indicator: Status/Servo Phase indicator.
Aircraft Heading: Indicates the direction the aircraft should be facing.

Flight Modes Setup

Flight modes can be set using CH5 (3-way switch) and CH7 (2-way switch) on the transmitter. The five available modes are: Vertical, Stabilize, Gyro, Acro, and Manual.

Mode Selection Logic:

CH5 Switch UP (Value 0~700) + CH7 Switch UP: Stabilize Mode
CH5 Switch UP (Value 0~700) + CH7 Switch DOWN: Vertical Mode (Value 1301~2048)
CH5 Switch CENTER (Value 701~1300) + CH7 Switch UP: Gyro Mode (Value 0~1300)
CH5 Switch CENTER (Value 701~1300) + CH7 Switch DOWN: Acro Mode (Value 1301~2048)
CH5 Switch DOWN (Value 1301~2048): Manual Mode

Transmitter Phase Setup

Ensure the servo phases are correct before flight. For example, in Manual Mode and Mode 2:

CH3 (Throttle): Reversed
Other channels: Normal

Power-On Calibration

When the aircraft is powered on, the gyro on Byme-A will calibrate. The green LED will flash. Please keep the aircraft still until the green light is always on.

Attitude Calibration

Byme-A needs to calibrate its attitudes/level to ensure a balanced status. It is advised to lift the model's head at a certain angle to ensure calibration accuracy. The calibration will be recorded upon successful completion.

To perform attitude calibration: Pull both joysticks to the outside corners and hold for more than 3 seconds. The green LED flashing once indicates successful calibration.

Servo Phase

Ensure the servo phases are correct before flight. For example, in Manual Mode and Mode 2:

Pitching to left: Left aileron lifted, Right aileron pressed.
Pitching downward: Horizontal tail lifted.

Reversed servo phases can be adjusted by the Byme-A flight controller.

Output Servo Phase Adjustment

Press the button at the front of Byme-A to change the servo phase:

Short press once: Aileron servo reversed, LED1 ON/OFF.
Short press twice: Elevator servo reversed, LED2 ON/OFF.
Short press four times: Rudder servo reversed, LED4 ON/OFF.

Note: Ensure attitude calibration is complete before changing servo phases. Byme-A will automatically identify the installation position (above/bottom of the aircraft) to adjust the gyro direction.

Flight Modes Explained

1. Stabilize Mode

In this mode, the model's attitude (inclination angles) is controlled by the joysticks. The maximum inclination angle is 70° for rolling and 45° for pitching.

Model leans to left (move left): Left aileron lifted.
Model leans to right (move right): Right aileron pressed.
Model head lifts (move backward): Elevator moves up.
Model head pressed (move forward): Elevator moves down.
Rudder to left: Vertical tail moves left.
Rudder to right: Vertical tail moves right.

2. Vertical Mode

Under this mode, the aircraft will maintain a vertical posture and direction. The altitude algorithm of Byme-A maps the joystick operation onto horizontal coordinates and controls the full altitude.

Moving left/right: Toggle the rolling joystick (CH1).
Moving forward/backward: Toggle the pitching joystick (CH2).
Rotating: Toggle the rudder joystick (CH4).

3. Gyro Mode

The model's rotation (angular velocity) is controlled by joysticks, with a three-axis gyro increasing stability. The aircraft will rotate with corresponding velocity by toggling the joysticks of rolling, pitching, and rudder. This is an advanced mode; the model will not level itself and will keep rotating when the joystick is released.

Models moves anticlockwise (with small range): Rudder moves left.
Models rotates anticlockwise (with large range): Rudder moves left.

4. Acro Mode

This mode is a combination of Stabilize Mode and Gyro Mode. When the joystick is at the center point, the aircraft will level. When joysticks are toggled with a small range, the aircraft will move to the corresponding directions. When joysticks are toggled with a large range, the aircraft will rotate to the corresponding directions.

Pilots control servos with corresponding channels via the transmitter; neither attitude nor gyro is involved.

Gyro Sensitivity

There is a certain stability margin for the Byme-D PID control. For different models, if the Byme-D under-corrects or over-corrects, pilots can try adjusting the rudder angle.

Thank You

Thank you again for choosing a Radiolink product.

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