DANGER-ZONE
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Atar 9 series is a turbojet.
RD-33/93 series is a turbo fan.
Plus RD93 offers more thrust in after burning mode.
For starters, Atar 9C is about 400kgs heavier than the RD 33, not to mention the internal plumbing regarding the two different engine designs.
Why would you put a turbojet, that is heavier and uses more fuel providing less thrust, when you can have a more robust RD33/93?
Mirage's Atar engine can be replaced with RD-33 engines with a little modification in aircraft and in engine. South Africans did it with their Cheetahs and Mirage F-1 ....
Super Cheetah:
Super Mirage F1:
Bayou Renaissance Man: Weekend Wings #41: South Africa's "Franken-Mirages", Part 3 of 3