# What is the type of nozzle used on the MiG-21 and MiG-27? [duplicate]

Generally supersonic fighters have convergent - divergent nozzles. What is type of nozzle used in MiG-21 and MiG-27?

Also please explain that how in a convergent nozzle where the max velocity in the nozzle is limited to one mach , how can the ac still go supersonic??

• I suggest you delete the second part of the question, because it is already answered in the question Peter Kämpf linked and because it is not related to the first part anyway. – Jan Hudec Feb 11 '16 at 18:21

In theory, the aircraft speed is not limited by the exit speed, but the extra speed imparted to a mass of air by the engine (more the $\Delta v$, more the thrust). Basically, there is nothing that prevents an aircraft with convergent nozzle from attaining supersonic speeds, albeit the system is very ineffecient.