Hi, kindly please read these three articles. They contain a wealth of information on the South African Air Forces upgrades of its Mirages, develpment of the advanced combat wing, and experimental re-engining of its Mirages with RD-33 engines.
The time of the Mirage 3/5 has passed and it is not cost effective to upgrade them anymore.
https://bayourenaissanceman.blogspot.com/2011/06/weekend-wings-39-south-africas-franken.html
https://bayourenaissanceman.blogspot.com/2011/06/weekend-wings-40-south-africas-franken.html
https://bayourenaissanceman.blogspot.com/2011/07/weekend-wings-41-south-africas-franken.html
I also remember reading in the late 90's early 2000's that the PAF had examined and discussed with the SAAF re-engining Mirages with RD-33 engines.
The French also had developed a version of the Mirage-III called the Mirage IIING, that had a fly-by-wire flight control system way back in 1982, but had no takers as the Mirage 2000 was available at that point in time.
http://www.wings-aviation.ch/57-Mirage/MirageNG.htm
The time of the Mirage 3/5 has passed and it is not cost effective to upgrade them anymore.
https://bayourenaissanceman.blogspot.com/2011/06/weekend-wings-39-south-africas-franken.html
https://bayourenaissanceman.blogspot.com/2011/06/weekend-wings-40-south-africas-franken.html
https://bayourenaissanceman.blogspot.com/2011/07/weekend-wings-41-south-africas-franken.html
I also remember reading in the late 90's early 2000's that the PAF had examined and discussed with the SAAF re-engining Mirages with RD-33 engines.
The French also had developed a version of the Mirage-III called the Mirage IIING, that had a fly-by-wire flight control system way back in 1982, but had no takers as the Mirage 2000 was available at that point in time.
http://www.wings-aviation.ch/57-Mirage/MirageNG.htm