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C/L:  Short for Control Line.  A traditional form of control for flying models.  Usually two lines (for up and down elevator control) connect the operator's handle to the aircraft which is then flown in a circle around the operator's position.   There are variations in line configurations such as mono-line for high speed or multi-line for added control functions (engine speed, flaps, arrest hooks, pilot ejection).

R/C:  Short for Remote Control or Radio Control.  In model airplanes, helicopters, boats and cars the operator uses a radio transmitter to send instructions to a receiver on the aircraft or vehicle.  These commands are then executed by servos or electronic speed controls.  A radio control system may control from one to ten actions or channels on a craft. Most commonly seen at airfields these days are three to six channel control including throttle, rudder, elevator,aileron, flaps, and landing gear retraction

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