this post was submitted on 19 Jul 2025
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[โ€“] Hamartiogonic@sopuli.xyz 7 points 2 weeks ago* (last edited 2 weeks ago) (6 children)

The plan is for the hydrogen-powered aircraft to take off like an airplane and then reach an orbit around the earth like a rocket.

Just for reference, the escape speed is 11.186 km/s or approximately mach 33.

The hypersonic aircraft equipped with such a propulsion system could make ESA's vision of developing a horizontal take-off spacecraft a reality.

Interesting, but I see this as only as a step in that direction, not the final product that actually stays in orbit. If it can reach whatever altitude you call space, it certainly wonโ€™t stay there on its own. With speed like that, itโ€™s just going to drop like a plane.

[โ€“] Jobe@feddit.org 5 points 2 weeks ago

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.

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