It is effectively a titanium nuclear ramjet with auxiliary electric fans, powered by an aneutronic reactor. It operates somewhere around Mach 3. It also needs canards and a droop snoot to land properly, and often crab-walks like the Concorde to do so.
And yes, I know there’s no blister for the rear undercarriage at the moment – I’m working on a technical drawing and I just wanted to sketch how they’d look in livery.