How to balance an RC aircraft and find the correct CG
One of the most important setup guides: find the CG, install the flight battery, balance the aircraft and avoid nose-heavy or tail-heavy surprises.
Start with the manufacturer CG range
Use the manual CG location or range as the first reference. Measure from the correct point, usually the wing leading edge at the root, and mark both sides clearly.
If the manual gives a range, start near the safer forward part of the range for early flights unless the manufacturer says otherwise.
Balance the aircraft in flight condition
Install the actual flight battery, propeller, canopy, landing gear, receiver pack and all parts that will be on the aircraft in the air. Balance changes when the battery, spinner or accessories change.
Use a CG stand or careful finger balance at the marked points. The model should settle predictably, without rolling off one side or hanging by a control surface.
Adjust weight before guessing in the air
Move the battery or equipment first. Add ballast only when necessary and secure it permanently. A battery that shifts in flight can turn a correct CG into an unsafe CG.
Nose-heavy aircraft may land faster and need more elevator. Tail-heavy aircraft can become unstable and difficult to recover, especially for beginners.
Controlled testing and adjustment
Good setup comes from a conservative baseline, one change at a time and conditions that leave room for error.
Begin with the manual CG, throws, expo and flight modes. Use rules of thumb only when verified data is unavailable, and stay conservative.
Do not move CG, change the propeller and increase throw in the same flight. One change plus a short note makes the result understandable.
Check trim, response and low-speed behavior at safe altitude, with a conservative timer and a landing plan already prepared.
Vibration, new noise, inconsistent range, unusual heat, excessive wind or an unstable approach mean land, go around or cancel.
CG checklist
- Manual CG location confirmed
- CG marks placed on both wing sides
- Flight battery installed
- All flight equipment installed
- Battery position adjusted before ballast
- Battery secured against movement
- Left-right balance checked
- First flight starts at conservative CG
Common questions
Is nose-heavy or tail-heavy safer?
A slightly nose-heavy model is usually more manageable than a tail-heavy model. Tail-heavy behavior can become unstable quickly.
Should CG be checked every flight?
Check it whenever battery size, equipment, repair, propeller, spinner or payload changes. On new models, check before every early flight.
Can I fix CG with transmitter trim?
No. Trim can correct small flight attitude issues, but it does not replace correct physical balance.
Relevant products from the catalog
Use these links as the practical buying path after reading the guide: aircraft, power system parts, tools and spares that usually complete the setup.
