[QUOTE=ORAC;11010418]Can’t help thinking Sabre is like fusion - always just a few years away....
Exactly. As noted above, the presumed cost savings from reuse-ability of HOTOL have been largely met by Space-X's approach.
That leaves the technology searching for a mission, but hypersonic fighters are just as operationally dubious as the US Army's pursuit of a 1000 mile range cannon.