Ich
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For me the F5 is one of the best testbed, if not the best testbed for to develop 4+ gen fighters. You can test nearly all components with it. So me think it is normal to build lots of variants in low numbers of it. Every variant tests an other upgrad/development, if it is avionics, airframe, materials or even engines. Me think the only puzzle piece what is left with the iranian testbeds is an engine with 30+ KN thrust.