A demonstration precooler will be run in front of a Viper jet engine at REL’s B9 test facility in 2011. This precooler will incorporate full frost control and be built from full size SABRE engine modules. The facility will incorporate a high pressure helium loop that rejects the absorbed heat to a bath of liquid nitrogen.
So they didn't make one yet.
Originally Posted by Robyn
Paul Czysz
Paul Czysz Hypersonic Interview