[echelon]

So these are their new partners after Rolls-Royce dropped them [1]?

Hopefully it works out this time. This is a very hard problem, and they're outsourcing one of the most critical components.

[1] https://denvergazette.com/news/business/colorado-s-boom-supe...

[geocrasher]

Every aircraft manufacturer outsources their engines to other manufacturers. This is normal in the aerospace industry. Even rockets have motors made by different companies most of the time.

As far as this particular project goes though, I would have a hard time expecting it to succeed. They have a great number of hurdles to overcome, and the engine design has to be the biggest one. Designing an engine that can work efficiently in both subsonic and supersonic regimes without an afterburner is very very difficult.

[bagels]

With this announcement, I wondered to myself which party decided to end the partnership?

It's highly probable that Rolls-Royce left the deal, and not vice versa, but the GP press release leaves that question unanswered.

[ulfw]

I don’t See them as a serious business. When the four major engine producers are all not on board there just isn’t anything technologically advanced out there. Engine development is very expensive.