It will need to switch the engines from using air from the atmosphere to using liquid oxygen carried onboard. This is what the SABRE engine mentioned in the article was supposed to do before they lost funding. Reaction systems was working on the SABRE engine to power a spaceplane called the Skylon which was very similar to this.
It will need to switch the engines from using air from the atmosphere to using liquid oxygen carried onboard. This is what the SABRE engine mentioned in the article was supposed to do before they lost funding. Reaction systems was working on the SABRE engine to power a spaceplane called the Skylon which was very similar to this.