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The Mach number (M or Ma), often only Mach, (/ m ɑː k /; German:) is a dimensionless quantity in fluid dynamics representing the ratio of flow velocity past a boundary to the local speed of sound. [1] [2] It is named after the Austrian physicist and philosopher Ernst Mach. =, where: M is the local Mach number,
The Sprint was a two-stage, solid-fuel anti-ballistic missile (ABM), armed with a W66 enhanced-radiation thermonuclear warhead used by the United States Army during 1975–76. It was designed to intercept incoming reentry vehicles (RV) after they had descended below an altitude of about 60 kilometres (37 mi), where the thickening air stripped away any decoys or radar reflectors and exposed the ...
In transonic flight, wave drag is the result of the formation of shockwaves in the fluid, formed when local areas of supersonic (Mach number greater than 1.0) flow are created. In practice, supersonic flow occurs on bodies traveling well below the speed of sound, as the local speed of air increases as it accelerates over the body to speeds ...
The X-15 had an ejection seat designed to operate at speeds up to Mach 4 (4,500 km/h; 2,800 mph) and/or 120,000 feet (37 km) (23 miles) altitude, although it was never used during the program. [12] In the event of ejection, the seat was designed to deploy fins, which were used until it reached a safer speed/altitude at which to deploy its main ...
Maximum speed: 618 kn (711 mph, 1,145 km/h) / Mach 0.94 at sea level; 578 kn (665 mph; 1,070 km/h) / Mach 0.97 at altitude. Combat range: 400 nmi (460 mi, 740 km) high-altitude intercept with 3 minutes combat and reserves for VL; 250 nmi (288 mi; 463 km) for ground attack missions. Combat profiles: from carrier with 12° ramp at ISA + 15°C ...
20 July 1963: First Mach 3 flight tracked by MSQ 39 Radar on an RBS Train stationed at the Army Depot at McAlester, OK. The A-12 flew above 83,000 feet, at 2,250 MPH ground speed. [citation needed] 7 August 1963: First flight of the YF-12A with Lockheed test pilot James Eastham at Groom Lake. June 1964: Last production A-12 delivered to Groom Lake.
The test aircraft then accelerated to Mach 5.1 (3,400 mph; 5,400 km/h) and flew for 210 seconds until running out of fuel and plunging into the Pacific Ocean off Point Mugu for over six minutes of total flight time; this test was the longest air-breathing hypersonic flight. Researchers collected telemetry data for 370 seconds of flight.
Elliott holds the track record for fastest qualifying speed at Talladega at 212.809 miles per hour (342.483 km/h) and Daytona International Speedway at 210.364 miles per hour (338.548 km/h), both of which were set in 1987; the mark at Talladega is the fastest qualifying speed for any NASCAR race ever. With the usage of restrictor plates at ...