JinDou400 ramjet detonation engine's successful Mach 4 flight (3,106 mph) at 65,000 ft

https://newatlas.com/aircraft/space-transportation-mach-4-ramjet-detonation-engine-success/

"controlled detonations in combustion chamber, far more power/ thrust/ efficiency with less fuel, but only at much higher speeds... 10 ft length, 12 inches diameter., 882 lbf thrust... no moving parts, more compact, lightweight, cost-effective to produce, but ineffective at low speeds/ accompanied by turbojets to handle subsonic flight... aim: 2027 maiden flight (prototype flown October 2024)... nearly 2X current passenger flight altitude, >2X Concorde's fastest speeds... VTOL capabilities (vertical take-off and landing)"