Not ready for flight tests, it is a test of the pre-cooler systems. These tests have occurred earlier, but the upcoming tests are a bit more rigorous, if I am understanding the story correctly.
If it goes on a Skylon spaceplane, it will be a SSTO platform. Didn't someone ask the question of: do these "suck"?
The Skylon might be better than a flying gas can. That's what they said about the cancelled VentureStar SSTO program. The key is re-usability and a quick turnaround time. Smaller payloads could be justified if the turnaround time was shorter. The idea is cheaper operations. Lower cost to orbit.
BBC News - UK's air-breathing rocket engine set for key tests https://t.co/VjAWPzfoh8— Greg Meadows (@BootsandOilBlog) March 20, 2019
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