Proponents of scramjet technology often cite such a vehicle as being a possible application of that type of engine, however pure rocket and subsonic combustion jet designs have also been proposed and may be easier to design and build.
Proponents of scramjet technology often cite such a vehicle as being a possible application of that type of engine. However designs have also been proposed that cimbine pure rocket and subsonic combustion jet configurations in a single vehicle, and these may be easier to design and build.