Hypersonic passenger aircraft concept. © JAXA
Japan’s Mach 5 ramjet engine for hypersonic aircraft has passed a major ground test.
The engine, developed by the Japan Aerospace Exploration Agency (JAXA), was tested together with a full experimental aircraft body. The hydrogen-powered engine could one day help create hypersonic passenger planes that fly at five times the speed of sound, cutting long-distance travel times dramatically.
The April 2026 tests took place at JAXA’s Kakuda Space Center in Miyagi Prefecture, Japan. Researchers from Waseda University, the University of Tokyo, and Keio University also took part in the project.
Scientists recreated the extreme conditions of Mach 5 flight, where temperatures around the aircraft can reach nearly 1,000°C. JAXA says it successfully designed a heat shield system that kept the inside of the aircraft near normal temperatures, allowing onboard electronics to work properly.
Why it matters:
If successful, hypersonic aircraft could revolutionize air travel by making ultra-fast flights possible while using cleaner hydrogen fuel technology.
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