0 final parabola angle (deg) 0, initial parabola angle (deg) 50 40 40 30 20 20 Nozzle correction factor 10 10 TTT 0 10 20 30 Expansion area ratio 100 10 99 40 98 39 30 97 96 95 60 60% length 70% length 80% length 90% length 100% length 60% length 70% length 80% length 90% length 100% length 40 50 Bell nozzles 15 deg point (100%) 70 80 Conical nozzle 90 100 Percent of length of a 15 deg half-angle conical nozzle with same area as bell shape