Prototype rocket engine for hypersonic? aircraft

[akarunway 1]

The Sabre. I work w/ heat exchangers in my line of work but this has the Mac Daddy. !000C to -150C in 100th of a sec. Pretty cool how the whole engine works. http://www.reactionengines.co.uk/heatex.html

I hold it true, whate'er befall;
I feel it, when I sorrow most;
'Tis better to have loved and lost
Than never to have loved at all.