Buddy box!

flyrc
 
Nowadays, it is standard practice to use a buddy box system during preliminary flight training, this being the equivalent of dual controls in a full size aircraft. Typically - two transmitters are connected by a cable, although this is now being replaced by wireless systems. The instructor has a switch which enables activation (or not!) of the control sticks on the students transmitter.
 
These wonderful set of photos of the Buddy Box system in action are courtesy of Peter Smith, Mark Primavera, and Cec Marshall.
 

Click on images below to enlarge and read the captions

 

(cartoon courtesy RC Modeler - June 1981)           

View the embedded image gallery online at:
http://soomodellers.ca/index.php/pics/buddy-box#sigProId8c7f8bb787

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