Four testers should be on duty all the time. Two are ready to steady the bucket and catch it 2 .
Consistency is important.
This means we attempt to be fair to all contestants by adding sand at roughly the same rate for all bridges. However, because some bridges are much stronger than others, we must also use weights. Start off each bridge with one 10 lb weight, unless there is reasonable doubt that the bridge will support that weight. For some bridges you will be directed to add additional weight to start. Strong bridges will likely require up to 80 lbs of weights.