It claims it will use rotating detonation engines, which are currently at a NASA tech demo stage. At best. They're super complex, currently not very stable. It'

It claims it will use rotating detonation engines, which are currently at a NASA tech demo stage. At best. They're super complex, currently not very stable. It's long, long way from becoming stable & reliable enough to be used as plane engines or being commercially available. The current record is 10 minutes firing. https://www.nasa.gov/centers/marshall/feature/nasa-validates-revolutionary-propulsion-design-for-deep-space-missions https://www.nasa.gov/centers/marshall/feature/nasa-validates...