Any one else notice the similarity between the Nose section of the X51 and the Zero-X? Derek Meddings was either able to visit the future or a lot of NASA boffins are Thunderbirds fans.
There's another similarity between them they both tend to crash, still being unmanned the X51 doesn't require the services of International rescue.
piperarcher if you do look at the Reaction Engines web site have a look at LAPCAT the hypersonic stratospheric airliner study using SCIMITAR a derivative of the SABRE engines they are developing for SKYLON.