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Is there a time after a helicopter gets hung up in a ceiling obstacle the judges should use before calling a halt to the time.

The rules do not mandate any amount of time for hang-ups to continue legal flight time. Whether the rotors are supporting the weight of the helicopter or not is the only factor determining whether a flight is over or not and this will be up to the judgement of the event supervisor at the individual tournament. We cannot comment on a specific scenarios or occurrences without having actually been physically present.