TECHNICAL SUPPORT
Published 2026-04-20
This guide provides a complete, step-by-step method for wiring and programming dual aileronservos with electronic mixing on a fixed-wing model aircraft. Unlike a singleservowith torque rods or a Y-harness, dual-servoailerons allow independent adjustment of each aileron, enabling differential throw, flaperons, and precise centering. The information below is based on standard radio control practices verified through thousands of real-world setups. All steps assume you have a computer transmitter with at least two open channels (typically CH1 and CH5 or CH6) and two standard analog or digital servos.
Before connecting anything, you must choose the correct wiring method for your goal. Only one method provides electronic mixing.
Method A: Y‑harness (No mixing)– Both servos connect to a single receiver channel via a Y‑cable. The transmitter sees only one aileron channel. This method doesnotallow independent servo adjustment, differential, or flaperons. Use only if your transmitter lacks mixing functions.
Method B: Dual‑channel with mixing (Recommended)– Each servo connects to its own receiver channel (e.g., Aileron channel and Aux1 channel). The transmitter electronically links (“mixes”) the two channels so they move together. This guide focuses entirely on Method B.
Core principle:Electronic mixing happens inside the transmitter, not by any special wiring. The wiring simply connects each servo to a separate channel.
2× standard or mini servos (same model recommended for equal speed/torque)
1× receiver with at least 5 channels (CH1 = Throttle, CH2 = Aileron, CH3 = Elevator, CH4 = Rudder, CH5 = Aux1 for second aileron)
1× transmitter that supports “dual aileron” or “flaperon” wing type (most computer radios from the past 15 years have this)
Servo extension wires (if wing is removable)
Small Phillips screwdriver for servo horns
Foam or double‑sided tape for mounting
The most common configuration has one servo mounted in each wing half, facing the aileron. Follow this verified sequence:
1. Determine servo direction– Place both servos on the bench, connect them temporarily to the same receiver channel, and move the stick. Note which servo rotates clockwise and counter‑clockwise. For a typical installation, when the right aileron goesup, the left aileron must godown. If both move the same direction, you will reverse one servo later in the transmitter (not by flipping wires).
2. Install servos– Mount each servo in its wing pocket so the output shaft points toward the aileron hinge line. Use the supplied rubber grommets and brass eyelets to reduce vibration.
3. Attach servo arms– Center each servo (see Section 5) before attaching the arm. The arm should be perpendicular to the servo body when the transmitter stick is neutral.
4. Connect pushrods– Use a clevis or Z‑bend to connect the servo arm to the aileron horn. The hole in the servo arm should be directly above the hinge line when the aileron is neutral.
Common real‑world issue:One aileron moves farther than the other. This is almost always due to mismatched pushrod geometry or different servo arm lengths, not the mixing. Always use identical servo arms and pushrod connections.
Follow this exact wiring sequence. Do not connect the battery until all wires are inserted.
1. Identify receiver channels– Look at the label on your receiver. Typically:
CH1: Throttle (ESC or servo)
CH2: Aileron (will be right aileron in most setups)
CH3: Elevator
CH4: Rudder
CH5: Aux1 (left aileron)
Some receivers label channels as “AIL” and “AUX1”. Confirm with your manual.
2. Connect the right aileron servo– Plug the servo’s signal wire (usually orange, yellow, or white) into the CH2 (Aileron) port. The ground (brown or black) goes to the outer pin (usually marked “-”). The positive (red) goes to the middle pin.
3. Connect the left aileron servo– Plug the second servo into CH5 (Aux1) or any unused channel that supports mixing. Donotuse CH2 for both servos – that would require a Y‑harness and disables mixing.
4. Secure wiring– If the wing is removable, use servo extension wires with locking connectors. Route wires away from pushrods and hinges.
Example from a typical 1.2m wingspan trainer: The builder connects the right wing servo to CH2, the left wing servo to CH5, then sets the transmitter wing type to “Dual Aileron”. No Y‑cable is used. This setup has worked reliably on hundreds of models.
Now the wiring is complete. All remaining work happens in the transmitter. The exact menu names vary, but the logic is universal.
Go to the Model SetuporWing Type menu. Choose one of the following:
Dual Aileron (most common name)
Flaperon (allows both ailerons to move together as flaps)
2 Aileron (used by some brands)
Donot choose “Normal” or “1 Aileron” – those assume a Y‑harness.
After selecting this, the transmitter automatically assigns:
Right aileron → CH2 (Aileron)
Left aileron → CH5 (Aux1)
Move the aileron stick to the right. The right aileron should go upand theleft aileron should go down. If one moves the wrong direction:
Go to the Servo Reverse menu.
Reverse only the channel that moves incorrectly (CH2 or CH5). Do not reverse both.
Sub‑trim – Adjust so each aileron is perfectly neutral (flush with the wing trailing edge) when the stick is centered. Use sub‑trim, not mechanical adjustments, for fine corrections.
End points (Travel) – Move the stick fully right. Adjust the travel of CH2 so the right aileron reaches the desired up deflection (typically 10–15mm for a trainer). Then move the stick fully left. Adjust the travel of CH5 so the left aileron reaches the desired up deflection. The down deflections will automatically match if the geometry is identical.
Aileron differential means more up travel than down travel, which reduces adverse yaw. To set differential:
Look for theAileron Differential menu (often inside “Dual Aileron” or “Flaperon” settings).
Set a value such that down travel is 50–70% of up travel. For example, if up = 15mm, set down = 8–10mm.
If your transmitter lacks a dedicated differential menu, you can achieve the same by adjusting the end points independently for up and down (some radios allow separate travel for each direction).
Before flying, perform this ground test sequence:
1. Power on the transmitter first, then the receiver.
2. Move the aileron stick slowly – Watch both ailerons. They should move simultaneously and smoothly. There should be no lag or jitter.
3. Check for binding – Move the stick to full deflection and hold. Listen for servo buzzing. If you hear buzzing, reduce the end points until the buzzing stops.
4. Test with other controls – Move elevator and rudder while holding aileron. The ailerons must not move. If they do, you have an unintended mix – disable all other mixes.
5. Cycle the battery – Run the servos for 30 seconds. If the receiver voltage drops below 4.8V (for NiMH) or 5.0V (for BEC), your servos may be drawing too much current. Upgrade the BEC or use a separate receiver battery.
Most common mistake: Forgetting to set the wing type after wiring. The result is that only one aileron moves. Simply go back to Step 5.1.
Core point repeated: Dual aileron mixing requires two separate receiver channels (e.g., CH2 and CH5) and a transmitter wing type set to Dual Aileron or Flaperon. The wiring itself is simple – one servo per channel – while the mixing is entirely electronic inside the transmitter.
Recommended next steps:
1. Before installing servos, bench‑test the entire system – receiver, transmitter, both servos,and battery – to confirm mixing works.
2. Write down your transmitter’s end point and differential values. After a test flight, you will likely need to reduce aileron throws (many models are overly sensitive at recommended book values).
3. Always mechanically center the servos (remove the arm, power up with stick neutral, then attach the arm at 90 degrees) before using sub‑trim. Sub‑trim should only make minor corrections.
4. If you later add flaps, keep the dual aileron wiring – you can then configure “crow” or “butterfly” mixing (both ailerons up, both flaps down) without changing any wires.
By following this guide exactly, you will achieve a reliable, fully adjustable dual aileron system that outperforms any Y‑harness setup. Test on the ground, then enjoy precise roll control in the air.
Update Time：2026-04-20
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