Mach number
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The Mach number, often only Mach, is a dimensionless quantity in fluid dynamics representing the ratio of flow velocity past a boundary to the local speed of sound. It is named after Austrian physicis
An F/A-18F Super Hornet creating a vapor cone at transonic speed just before reaching the speed of sound.
Hypersonic speed
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In aerodynamics, hypersonic speed refers to speeds much faster than the speed of sound, usually more than approximately Mach 5.
Mach number
…thin aerofoil sections, and all-moving tailplane/canards are common. Modern combat aircraft must compromise in order to maintain low-speed handling. Hypersonic 5.0–10.0 3,308–6,615 3,806–7,680 6,126–12,251 1,702–3,403 The X-15, at Mach 6.72, is one of the fastest crewed aircraft. Cooled nickel-titanium skin…
CFD image of the NASA X-43A at Mach 7