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Flow in this regime is still Mach number dependent. Simulations start to depend on the use of a constant-temperature wall, rather than the adiabatic wall typically used at lower speeds. The lower border of this region is around Mach 5, where ramjets become inefficient, and the upper border around Mach 10–12. [citation needed]
At Mach 0.65, u is 65% of the speed of sound (subsonic), and, at Mach 1.35, u is 35% faster than the speed of sound (supersonic). An F/A-18 Hornet creating a vapor cone at transonic speed just before reaching the speed of sound. The local speed of sound, and hence the Mach number, depends on the temperature of the surrounding gas.
As the RV would be traveling at about 5 miles per second (8,047 m/s; 26,400 ft/s; Mach 24), Sprint needed to have phenomenal performance to achieve an interception in the few seconds before the RV reached its target. Sprint accelerated at 100 g, reaching a speed of Mach 10 (12,000 km/h; 7,600 mph) in 5 seconds. Such a high velocity at ...
Artist's conception of the HSSW, coming to a secure, undisclosed location near you by 2030. Source: Lockheed Martin Good news, bad news -- which would you like first? Actually, let's start with ...
Mach No. [a] Vehicle Crew Date Certifier Refs Uncrewed aerial vehicle 21,245: 13,201 ~20 HTV‑2 (uncrewed) 22 Apr 2010 (unofficial) [33] Crewed, rocket-powered: 7,270: 4,520: 6.7 North American X‑15A‑2: William J. Knight: 3 Oct 1967 GWR [34] [35] Crewed, air-breathing 3,529.56: 2,193.17: 3.3 Lockheed SR‑71A Blackbird #61‑7958 Eldon W ...
Mach number is more useful, and most high-speed aircraft are limited to a maximum operating Mach number, also known as M MO. For example, if the M MO is Mach 0.83, then at 9,100 m (30,000 ft) where the speed of sound under standard conditions is 1,093 kilometres per hour (590 kn), the true airspeed at M MO is 906 kilometres per hour (489 kn).
1.716 × 10 −9: 1 knot (nautical mile per hour) 10 0: 1.2: ... cheetah—fastest of all terrestrial animals; sailfish—fastest fish; speed of go-fast boat. 40: 140 ...
Airspeed is commonly given in knots (kn). Since 2010, the International Civil Aviation Organization (ICAO) recommends using kilometers per hour (km/h) for airspeed (and meters per second for wind speed on runways), but allows using the de facto standard of knots, and has no set date on when to stop.