The X-15 could swing it in about 30 seconds shy of two hours. At hypersonic speeds, you could expect to make the trip in a cool two hours and 40 minutes. The Airbus A380 taking the inaugural flight landed after 16 hours and 24 minutes. The flight from Dubai to New Zealand recently became the longest non-stop scheduled commercial flight by distance at 8,824 miles.The X-43A meanwhile, could make the trip in 26 minutes. At hypersonic speeds that takes about 50 minutes-and only 37 minutes in an X-15. The longest commercial flight in the contiguous United States is Miami to Seattle at 2,724 miles or about six hours and 40 minutes in typical flight time.At a paltry speed of Mach 1, it would take over a day and a half-about 37 hours and 45 minutes. The X-15 could do it in just over five and a half, and the X-34A in just three hours and 55 minutes. Given that the circumference of the Earth is 24,901 miles, a hypersonic jet could fly around the world in just over seven and a half hours.So without further ado, hypersonic speeds in more practical terms: And even though the speed of sound varies based on altitude and temperature, we'll set it to a fixed 660 miles per hour, which is what you would expect at a cruising altitude of 40,000 feet and temperature of -70 degrees Fahrenheit. The Air Force and NASA's two record flights can be used to extrapolate what even higher speeds might look like. The top speed of military aircraft like the SR-72 is estimated and unsurprisingly classified, with officials saying only that it will be able to hit at least the minimum hypersonic speed of Mach 5, so we'll use that as our baseline. In 2004, the uncrewed NASA X-43A set a speed record at Mach 9.6, or 7,310 mph at an altitude of about 110,000 feet. Knight set the record for fastest crewed flight in 1967 when he piloted the North American X-15 to Mach 6.72 (4,520 mph) at an altitude of 102,100 feet. Air Force and NASA when test pilot William J. Hypersonic speeds have been achieved before, most notably by the U.S. These things don't happen at one particular speed, so the term "hypersonic" instead refers to the point at which they start to meaningfully affect the mechanics of flight-generally accepted to be Mach 5, or 3,836.35 mph in conditions of 20 degrees Celsius at sea level. Generally, hypersonic speeds are the point at which the molecules of air that surround the aircraft start to change by breaking apart ( dissociation) and/or picking up electrical charge ( ionization).
But while "supersonic" has the clear cut definition of being faster than the speed of sound (Mach 1), hypersonic is a little fuzzier. Hypersonic is, obviously, supersonic on steroids. It's all very impressive, but it can be hard to wrap your head around in the abstract, so let's do a little bit of napkin math to really bring it home.įirst, let's establish some terms. The hypersonic SR-72 is reported to be making great gains in secret. The United States is currently developing hypersonic missiles that travel in excess of 6,000 miles per hour. If you have a need for speed, the next frontier is hypersonic.
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