LOL the name sounds like it would be even louder than a normal rocket engine. A major engineering feat all by itself.

GR8 achivement! Congratulations and celebrations.

Excellent! Now we can get to Alpha Centauri in 10,791 years and 12 hours instead of 10,791 years and 13 hours.

Tremendous achievement. Should we be showing this and describing the methodology to the rest of the world?

US is far from being first who tests this kind of engines, so title is wrong. Russia tested first prototype 4 years ago and then two years ago tested 2 tonnes thrust example of this thing.

This reminds me of a pulse jet (V1) They are also famously loud. They run on fuel/air, and some versions do not need valves. What is the fuel efficiency of this new engine, compared to normal rocket motors, which achieve full combustion? Is the advantage the speed of exhaust?

How will they dampen the vibration? Will they need several detonation engines running out of phase like the pistons in an engine? The intense heat would also be another problem to be managed. What is theoretically possible and what is practical are often very difficult to reconcile.

What's the lifetime of an engine like this compared to a conventional rocket engine?

What is the hoped-for specific impulse of this engine? The RL-10 is indeed an old engine, but it is still around because if has an extremely high at 465, and it would be pretty hard to top that for a vacuum engine.

I wonder what impact that would have on the G-loads for the payload?