CERTIFICATE FROM THE HEAD OF THE INSTITUTION

Some important aircraft of this type are US Air Force’s F/A-22 (Raptors) and Russia’s Sukhoi Su-37 and 30. Other experimental aircraft are Boeing X-32, Mc Donnel Douglas X-36 (yaw only) and Zeppelin NT which have the capability to redirect their engine exhaust and to change their velocity vector at will. ................
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