A radio installation is more than binding a receiver and checking whether the servos move. The transmitter has to be programmed correctly, the receiver and antennas need to be installed properly, the control surfaces must move in the right direction, and the airplane still needs a range test and a working failsafe before it is ready to fly.
This center puts those jobs in a sensible order. If you are completely new to transmitters, receivers, channels, and servos, begin with the radio-systems guide. If the equipment is already installed, jump to the part of the setup you are working on.
Start with the propeller removed
Whenever practical on an electric airplane, remove the propeller before programming the radio, reversing a channel, setting throttle travel, or troubleshooting a receiver. A motor can start because of a programming mistake, an unexpected switch position, or a lost-and-restored connection.
Radio and Receiver Learning Path
1. Understand the radio system
Learn what the transmitter, receiver, channels, protocols, telemetry, servos, switches, and control modes do before you begin programming.
2. Create and program the model
Choose the correct model type, assign the wing and tail arrangement, set throttle safety, confirm channel direction, and establish reasonable starting values.
3. Install and check the receiver
Mount the receiver, route the antennas, connect the servos, set the failsafe, and complete a range test using the instructions for your equipment.
4. Set up the servos
Center the servos mechanically, use the correct arms and linkages, prevent binding, and understand torque, speed, voltage, and servo size.
5. Set throws, rates, and expo
Verify control direction first, then measure the manufacturer’s recommended throws and add rates or expo only when they serve a clear purpose.
6. Configure stabilization
AS3X, SAFE, and other gyros require a separate correction-direction check. Correct stick movement does not prove the gyro will correct in the right direction.
A Practical Setup Order
Read the airplane and radio instructions
Start with the airplane manufacturer’s control throws, center-of-gravity range, channel requirements, and any receiver or stabilization restrictions. Use the radio manufacturer’s binding, failsafe, antenna, and range-test procedures.
Create a clean model memory
Select the correct airplane type and wing or tail configuration. Confirm you are editing the intended model before changing channel assignments, reversing, mixes, rates, or failsafe behavior.
Make throttle safe
Remove the propeller when practical, establish a throttle-cut switch, and confirm that low throttle and throttle cut produce the behavior required by the ESC or engine installation.
Center the mechanics
With trims and subtrims near neutral, install the servo arms and adjust the linkages so the control surfaces are mechanically close to neutral. Electronic adjustment should refine the setup, not hide badly positioned hardware.
Verify every direction
Move one transmitter control at a time and watch the corresponding surface. Check aileron, elevator, rudder, throttle, flaps, retracts, and any other assigned function before measuring travel.
Set travel without binding
Use the airplane manufacturer’s starting throws when available. Check both ends of every movement and listen for buzzing or strain that suggests the linkage or surface is binding.
Program optional features deliberately
Add dual rates, expo, flight modes, mixes, timers, telemetry alerts, stabilization, or sequenced functions one at a time. Test each change before adding another.
Set failsafe and range-test the finished airplane
Verify the actual failsafe response and perform the radio manufacturer’s range test with the airplane fully assembled and the equipment arranged as it will be flown.
Checks That Deserve Their Own Attention
Control direction
Standing behind the airplane, right aileron should raise the right aileron, up-elevator command should raise the elevator’s trailing edge, and right rudder should move the rudder to the right.
Gyro correction direction
Move the airplane by hand and confirm the stabilization system commands the surfaces to oppose that movement. This is a different test from moving the transmitter sticks.
Failsafe behavior
Do not assume that a successful bind created the failsafe response you want. Follow the receiver manufacturer’s procedure and test the result safely.
Receiver power
Confirm the receiver, servos, BEC or receiver battery, switches, extensions, and connectors are appropriate for the actual load. A radio link cannot help if the receiver loses power.
Keep the setup specific to the airplane. Copying another model memory can bring along reversed channels, forgotten mixes, unexpected switch assignments, or stabilization settings that do not belong in the new airplane.
When Something Does Not Work
Receiver will not bind or power up
Intermittent signal or radio trouble
Servo jitters or does not move
Servo buzzes at an endpoint
Gyro or AS3X oscillates
Start with the symptom
Where This Center Fits
This center covers the radio-specific path from understanding the equipment through programming, installation, control setup, failsafe, and range testing. The Setup & Preflight Center covers the rest of the airplane. The Troubleshooting Center begins with a symptom when something is not working correctly.