Random Duration Stay aloft as closely as possible to a time chosen by chance on the day of the meet. The time is the same for everyone. Except for Scale Altitude, any motor power is allowed. Scale Build and fly an accurate scale model. Supporting data is required.
Judges measure and rank the model.
The model must make a safe and stable flight. Scale Altitude Fly an accurate scale model to the highest possible altitude. Models are judged as for scale, and an additional factor is awarded for the altitude achieved. Super Scale Same as Scale, but includes a scale launching complex as well. Sport Scale Same as Scale, but the model is not measured.