similar Mach-5 evaluations in the U.S.).
An engineering team from JAXA, Waseda University, the University of Tokyo, and Keio University has successfully completed a ground combustion trial for a ramjet engine intended for a Mach‑5 hypersonic aircraft, marking a significant advancement towards a future where journeys from Tokyo to Los Angeles could approximately take the same duration as a brief domestic flight. The experiment occurred at JAXA’s Kakuda Space Center, replicating flight at five times the sound speed and concentrating on verifying the aircraft’s heat‑shielding, control surfaces, and engine capabilities under extreme conditions. The findings, along with aircraft like NASA’s “quiet” supersonic X-59, may assist in reshaping engineers’ perspectives on high‑altitude, high‑speed passenger, and potentially suborbital travel.