DARPA has started the Advanced Full Range Engine which will be a reusable hypersonic engine. It will have a regular turbine engine and then a dual combined cycle to reach Mach 5.
Normal jet engines can reach Mach 2.5
Hypersonic scram jets can start working at Mach 3.5
DARPA will make a hybrid engine. It will have a dual mode ramjet combined with a regular jet engine.
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Reposted via Next Big Future
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