Yeah, very true, I missed that the first time I opened the page. Honestly that makes this idea even more insane. Jet engines are hundreds or thousands of times

Yeah, very true, I missed that the first time I opened the page. Honestly that makes this idea even more insane. Jet engines are hundreds or thousands of times more fuel efficient than rocket engines, can run for days at a time, and most importantly doesn't have to carry its oxidizer onboard. Rocket engines (rather, large ones) run for minutes at a time and have to carry all fuel and oxygen - to run a rocket for an hour, you'd need an absolutely absurd fuel tank the size of a building. The guys who designed this are obviously smart, much smarter than me, but it's clear that they've taken some 'creative liberties' to design the concept. My suspicion is that the real product here is the rotational-detonation-engine, the entire "hypersonic passenger vehicle" is just a flashy sales pitch to drive investment & hype towards the development of a genuinely innovative engine that otherwise wouldn't have this amount of funding poured into it.