From a straight and level flight the model aircraft pulls up into the first half of a circular loop (commensurate with the performance of the subject type), and when inverted, performs a half roll before resuming straight and level flight on the opposite track. Low powered aircraft types would be expected to commence the maneuver by executing a shallow dive at full throttle in order to pick up the necessary speed.
- Track of the half loop not vertical.
- Half loop not centered on judges’ position.
- Half loop is not sufficiently semicircular.
- Roll starts too early or too late.
- Excessive height loss in the roll.
- Track veers during the roll.
- Does not resume straight and level flight on the opposite track to entry.
- Maneuver not flown parallel with judges’ line.
- Size of maneuver and speed not in manner of the prototype.
- Too far away / too close / too high / too low.