Encyclopedia entry CZ-2-3 stage series Original archive entry. The text, images and links below are kept as they were written. SubtopicsCZ-4A-3 N2O4/UDMH propellant rocket stage. .CZ-4B-3 N2O4/UDMH rocket stage. 98.10 kN (22,054 lbf) thrust. Mass 15,200 kg (33,510 lb).