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Gillette budgeted $300 million for a two-year advertising campaign for the Mach3 razor. [9] [11] Gillette marketed the three blade design as allowing for a shave with less pressure to the skin and with fewer strokes, thereby reducing skin irritation. The Mach3 razor was released in North America during the last week of June 1998. [12]
The Mach number is named after the physicist and philosopher Ernst Mach, [3] in honour of his achievements, according to a proposal by the aeronautical engineer Jakob Ackeret in 1929. [4] The word Mach is always capitalized since it derives from a proper name, and since the Mach number is a dimensionless quantity rather than a unit of measure ...
The bleed flow, 20% at Mach 3, was returned to the engine via 6 external tubes to cool the afterburner liner and primary nozzle as well as to provide extra air for combustion. [30] The J58 engine was the only operational turbojet engine, being designed to operate continuously even at maximum afterburning, for Mach 3.2 cruise.
The intake gains prominence at high speeds when it generates more compression than the compressor stage. Well-known examples are the Concorde and Lockheed SR-71 Blackbird propulsion systems where the intake and engine contributions to the total compression were 63%/8% [23] at Mach 2 and 54%/17% [24] at Mach 3+.
For flow between Mach 3 and 3.5 during cruise flight, speeds at which the turbojet could not function because of the temperature limitations of its turbine blades, this design provides the ability to operate from zero speed to over Mach 3 using the best features of both the turbojet and ramjet combined into a single engine. [3]
Mach 3 manned flight has provided an interesting illustration of how these losses can increase dramatically in an instant. The North American XB-70 Valkyrie and Lockheed SR-71 Blackbird at Mach 3 each had pressure recoveries of about 0.8, [41] [42] due to relatively low losses during the compression process, i.e. through systems of multiple ...
Interceptor-type aircraft emerging after the war used after-burning engines to give Mach 2 performance, while radar and infrared homing missiles greatly improved their accuracy and firepower. The U.S. Century Series such as the Lockheed F-104 Starfighter , as well as the Russian MiG-21 , English Electric Lightning , and French Dassault Mirage ...
It is commonly accepted that the supersonic speed range starts at a free stream speed greater than Mach 1.3. Aircraft designed to fly at supersonic speeds show large differences in their aerodynamic design because of the radical differences in the behavior of flows above Mach 1.
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