buddy box
n.— «Depending on the systems used, a novice pilot can try his or her wings under the tutelage of a more experienced pilot using what is called a “buddy box.” The student’s control box and the instructor’s control box are linked with a cable. The linked boxes allow the training pilot to take control of the model should the student get into trouble.» —“E-Flyers Club executes electric model plane flight plans” by Donna Riley-Lein Daily Sun (The Villages, Florida) July 24, 2006. (source: Double-Tongued Dictionary)
Further reading
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