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But airflow meeting the leading edges is initially decelerated, so the free stream speed must be slightly greater than Mach 1 to ensure that all of the flow over the aircraft is supersonic. It is commonly accepted that the supersonic speed range starts at a free stream speed greater than Mach 1.3.
Sonic the Hedgehog, [a] trademarked Sonic The Hedgehog, [1] is a blue anthropomorphic hedgehog and the main protagonist of the series. Developed as a replacement for their existing Alex Kidd mascot, as well as Sega's response to Mario, his first appearance was in the arcade game Rad Mobile as a cameo, before making his official debut in Sonic the Hedgehog (1991).