In article ,
ess says...

Reaction Engines completes precooler testing

http://www.reactionengines.co.uk/news_updates.html

Congrats on the precooler testing, now they need to move on to the next
phase of R&D. See: .signature

Put this head to head with SpaceX's Grasshopper and tell me which one is
going to be cheaper to develop and will be flying on an operational
launcher sooner.

Jeff
--
"the perennial claim that hypersonic airbreathing propulsion would
magically make space launch cheaper is nonsense -- LOX is much cheaper
than advanced airbreathing engines, and so are the tanks to put it in
and the extra thrust to carry it." - Henry Spencer