Advanced technology is also breathing fresh life into winged spacecraft. The buzz centres on a hypersonic engine known asa supersonic combustion ramjet, or scramjet. Despite the name, scramjets are very different to the turbojet engines that power commercial aircraft, not least because scramjet-powered vehicles must first be accelerated to Mach 4 or so using jet engines or rockets before their scramjets can work. This is because, unlike turbojets, scramjets do not use spinning blades to compress the air entering the engine. Instead, the high speed of the vehicle compresses the incoming air, which is then fed into a combustion chamber where the burning fuel creates an exhaust jetthat exits the engine faster than the air that entered.
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