JAPAN'S NEW HYPERSONIC ENGINE COULD MAKE 2-HOUR FLIGHTS TO THE US A REALITY

Summary from the TLDR newsletter

A team of engineers from Japan's Aerospace Exploration Agency (JAXA) and several Japanese universities has completed a successful ground combustion trial of a ramjet engine designed for a Mach-5 hypersonic aircraft. The test simulated a flight at five times the speed of sound. It was focused on validating the aircraft's heat-shielding, control surfaces, and engine performance under extreme conditions. The project's goal is commercial hypersonic passenger service by the 2040s.