mike-wsm
I've been looking for this for a long time! Thanks
Out of curiosity, do you remember anything about the Japanese ATREX engine, which had a pre-cooler and worked on a hydrogen-expander cycle? As I understand it, the design was cancelled in favor of a pre-cooled turbojet similar to the Scimitar, but it's pre-cooler seemed a lot smaller, lighter and simpler than the version used by Reaction Engines.