As I understand it, engine sourcing has been one of Boom's challenges. Rolls Royce was originally working on an engine for them, but cancelled it in '22. Boom announced their own engine design last year but I'm assuming that's not ready.
Apparently newer engines aren't designed for supersonic flight so I'm guessing options are limited for testing this airframe.
Apparently newer engines aren't designed for supersonic flight so I'm guessing options are limited for testing this airframe.