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2. Mach number - Wikipedia

   en.wikipedia.org/wiki/Mach_number

   The Mach number (M or Ma), often only ... So the regime of flight from Mcrit up to Mach 1.3 is called the transonic range. Supersonic: 1.2–5.0 794–3,308 915 ...

3. Critical Mach number - Wikipedia

   en.wikipedia.org/wiki/Critical_Mach_number

   In aerodynamics, the critical Mach number (Mcr or M*) ... Dassault Mirage III, and MiG 21, are intended to exceed Mach 1.0 in level flight, and are therefore designed ...

4. Machmeter - Wikipedia

   en.wikipedia.org/wiki/Machmeter

   A Machmeter is an aircraft pitot-static system flight instrument that shows the ratio of the true airspeed to the speed of sound, a dimensionless quantity called Mach number. This is shown on a Machmeter as a decimal fraction. An aircraft flying at the speed of sound is flying at a Mach number of one, expressed as Mach 1.

5. Transonic - Wikipedia

   en.wikipedia.org/wiki/Transonic

   Transonic (or transsonic) flow is air flowing around an object at a speed that generates regions of both subsonic and supersonic airflow around that object. [1] The exact range of speeds depends on the object's critical Mach number, but transonic flow is seen at flight speeds close to the speed of sound (343 m/s at sea level), typically between Mach 0.8 and 1.2.

6. Coffin corner (aerodynamics) - Wikipedia

   en.wikipedia.org/wiki/Coffin_corner_(aerodynamics)

   Graph of altitude/speed region envelope for Lockheed U-2 depicting coffin corner. Coffin corner (also known as the aerodynamic ceiling [1] or Q corner) is the region of flight where a fast but subsonic fixed-wing aircraft's stall speed is near the critical Mach number, at a given gross weight and G-force loading.

7. Hypersonic speed - Wikipedia

   en.wikipedia.org/wiki/Hypersonic_speed

   The precise Mach number at which a craft can be said to be flying at hypersonic speed ... So the regime of flight from Mcrit up to Mach 1.3 is called the transonic ...

8. Range (aeronautics) - Wikipedia

   en.wikipedia.org/wiki/Range_(aeronautics)

   For jet aircraft operating in the stratosphere (altitude approximately between 11 and 20 km), the speed of sound is approximately constant, hence flying at a fixed angle of attack and constant Mach number requires the aircraft to climb (as weight decreases due to fuel burn), without changing the value of the local speed of sound.

9. Equivalent airspeed - Wikipedia

   en.wikipedia.org/wiki/Equivalent_airspeed

   EAS can also be obtained from the aircraft Mach number and static pressure. = where a 0 is 1,225 km/h (661.45 kn) (the standard speed of sound at 15 °C), M is the Mach number, P is static pressure, and P 0 is standard sea level pressure (1013.25 hPa).