Why not take a look at:
http://www.reactionengines.co.uk/sabre.html
which may answer some of these questions?
I went to a talk by John Scott-Scott of Reaction Engines a few years back and was very impressed by his description of the engineering work for the Sabre engine. The Reaction Engines guys are practical engineers with a wealth of experience, far from the "bumbling Brits" some other comments suggest.
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Why not take a look at: http://www.reactionengines.co.uk/sabre.html which may answer some of these questions? I went to a talk by John Scott-Scott of Reaction Engines a few years back and was very impressed by his description of the engineering work for the Sabre engine. The Reaction Engines guys are practical engineers with a wealth of experience, far from the "bumbling Brits" some other comments suggest.