This contest is designed to see which kites fly the best.
Contestants launch their kites together and fly them to whatever height they like. Usually judges set a minimum 10 feet and a maximum 100 feet. At the end of a set amount of time, judges determine which kite is flying at the highest angle.
The judges can use a protractor to measure either the angle of the kite line at the fliers hand, or by looking along the protractor toward the kite.
The main criteria is how well a kite flies in a particular wind. Other factors include height since winds differ at different low altitudes, and flying line since line weight creates sag and drag on the kite.