and the highest energy piece may be less of a risk to penetrate a critical aircraft structure..There is less worry about 180 degree segment pieces than a 115 degree piece of disk. The smaller the angle section the lower the weight but the higher escape velocity. That works out to a highest penetration range for aircraft structures between about 100-140 degree segments (worst combination of translational velocity and weight) Of course anything really close by is going to suffer from the more numerous smaller fragments