For Skylon and for the LAPCAT program, I'm wondering why they didn't put an annular aerospike type nozzle on the design? As far as I know, the technology to make this work had at least been undergoing testing in the late 1960's (it was proposed for the engines used on the Saturn V), it provided something like a 30% improvement in efficiency, and it would be completely compatible with the SABRE, and could probable be incorporated on the Scimitar.
Last edited by Jane-DoH; 28th May 2011 at 20:12.