Buddy box
Two R/C transmitters joined for pilot training via cable.
Buddy box, also known as buddy boxing, is a colloquial term for a training system in radio-controlled (R/C) aircraft operation. It involves two R/C radio systems joined together via an umbilical cable, allowing a student to control the aircraft under the supervision of an instructor. This system is notable for being universal among the six major R/C radio manufacturers, meaning transmitters of different brands can be connected, provided they share the same type of DIN cable connector.
- Major manufacturers
- Spektrum, Futaba, JR, Hitec, Sanwa/Airtronics, KO Propo
- Connector types
- Two incompatible types of DIN cable connectors
- Switch location
- Top left corner of most transmitters
- Switch type
- Long-handled, spring-loaded switch (or push-button on some older Futaba radios)
Lore & Background
Buddy boxing is accomplished by joining the student and master transmitters with a cable, ensuring that servo reversing switches and trims are set identically on both. The student is given control via a spring-loaded switch on the master transmitter, typically held by the instructor. When the instructor pulls and holds the switch forward with the left index finger, control transfers to the student's transmitter. Releasing the switch instantly returns control to the master transmitter. On some older Futaba radios, such as the 6XA, the trainer switch is a push-button located in the corner, while the toggle switch in that position is reserved for channel 5 (landing gear).
The two transmitters need not be on the same frequency. The master transmitter is the one that actually flies the aircraft; buddy boxing effectively turns the student transmitter into a dummy remote control of the master. The student transmitter is operated with its power switched off, as power for both units is provided by the master transmitter. The student transmitter will power up via the umbilical cable despite being switched off.
Reader's Guide
The buddy box system's significance lies in its role as a standard training method in R/C aviation, allowing instructors to safely hand over control to students and instantly reclaim it if difficulties arise. Its universality across major manufacturers means that transmitters of different brands can be paired, as long as they share the same DIN connector type. This interoperability reduces the need for matching equipment, making training more accessible. The system's design—using a spring-loaded switch that defaults to the instructor—prioritizes safety, as control is automatically returned to the master transmitter if the instructor releases the switch. The ability for the student transmitter to operate without its own power, drawing it from the master via the cable, simplifies setup and ensures the student's transmitter functions solely as a remote control. The legacy of buddy boxing is its enduring presence as a practical, low-cost training solution that has been adopted by all major R/C radio manufacturers, with the only limitation being the compatibility of the two DIN connector types.
Did You Know?
- Buddy boxing is universal among the six major R/C radio manufacturers, allowing different brands to be connected.
- The student transmitter operates with its power switched off, drawing power from the master via the umbilical cable.
- On some older Futaba radios like the 6XA, the trainer switch is a push-button, not a toggle.
Frequently Asked Questions
What is a buddy box in RC aircraft?
A buddy box is a training arrangement in which two radio transmitters are linked by an umbilical cable so an instructor can supervise and override a student's stick inputs during flight. It is the standard method for teaching new R/C pilots to fly a model safely.
How does buddy boxing actually work in practice?
The student's transmitter is joined to the instructor's transmitter with a short cable, and the instructor's control inputs take priority over the student's. This lets the instructor seize control the instant the student makes a dangerous move, without anyone having to hand over a radio mid-flight.
Can I buddy box with transmitters from different brands?
Yes—the system is universal across the six major manufacturers (Spektrum, Futaba, JR, Hitec, Sanwa/Airtronics, and KO Propo) provided both units share the same DIN cable connector type. Because the hobby uses two incompatible DIN connector types, you'll need to match them or use an adapter.
Where is the buddy box switch located on my transmitter?
On most transmitters it sits in the top-left corner as a long-handled, spring-loaded switch. A few older Futaba radios use a push-button in that same spot instead of a lever.
Why do RC pilots prefer buddy boxing over just watching a student fly?
Because the instructor can physically override the student's inputs in real time, stopping a crash before it becomes one. It is the closest thing to an active safety net available in R/C flight training.
More in Radio-Controlled Aircraft 1-24
Spotted an error? Know more?
Reader corrections go straight into our review queue. Suggest an edit · How this site is sourced