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It looks like a stealth design for the MiG-21.

Okay.

But, why it has double tail fins? This tail fins should increase the agility at high angle of attack flights. But at the MiG-21 the air intake is to small, that you cant fly out the maximum possible performance of the wing design, because you get compressor stalls caused by to less airflow.

Then the stabilisation fins under the tail. It are nice radar reflectors. Also completly contrary to the stealth design.

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