Racing enthusiasts often have several different types of sails to suit different wind conditions. Sufficient cord for rigging your model is normally supplied in the kit. The two-channel system is used with a standard transmitter. The right stick, moving left and right, controls the rudder, and the left stick, moving up and down, controls the sail winch. Moving the stick up lets the sheets out, while moving it down hauls them in.
Some enthusiasts prefer to use a transmitter with a control wheel to control the steering.
Some of the simpler yacht kits use a single-channel with a control for the rudder only. Also see our Into to Radio's section A receiver unit in the boat takes the signals from the transmitter. This has an aerial, which may simply be a wire led around the cockpit interior or incorporated into the rigging. Signals via the receiver go to the steering servo which moves the rudder from side to side, and the sail control unit which hauls the sheets in and out to adjust to the wind conditions and the course being sailed. The sail control unit is usually a bar attached to the servo spindle in the smaller, simpler yachts.