Japan's New Hypersonic Engine Could Make 2-Hour Flights To The US A Reality
Summary
The article reports on JAXA's Mach-5 ramjet ground test and describes how this hypersonic propulsion research could enable extremely rapid transoceanic travel in the future. It explains the core ramjet concept, heat management challenges at high speeds, and outlines a roadmap toward potential commercial flights in the 2040s, noting regulatory and technical hurdles.