The European Space Agency (ESA) is funding the development of a hypersonic space plane pathfinder, which will start flying by 2031 if all goes according to plan.
The work is being done via a research program called Invictus, which is led by the consulting firm Frazer-Nash. Invictus will leverage technology developed by the English company Reaction Engines Ltd., which aimed to build a huge space plane called Skylon but went bankrupt last year.
The key piece of Invictus tech is a "pre-cooler," which Reaction Engines built and tested for its Synergetic Air-Breathing Rocket Engine (SABRE). SABRE combined aspects of jet and rocket propulsion; it was designed to pull oxygen out of the air during flight at lower levels of Earth's atmosphere, reducing the need to carry propellant and therefore increasing efficiency.
Source: www.space.com
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