Sentences with phrase «combustion ramjets»

To reach hypersonic speeds, current systems will need to be replaced by what engineers call «air - breathing» systems, which could be achieved by scramjets (also called «supersonic - combustion ramjets»).

Faster — and quieter — airplanes NASA's hypersonics research is pushing aviation speed limits with ultrafast scramjets (supersonic combustion ramjet engines): In 2004, the agency's unmanned hypersonic X-43A craft briefly reached Mach 9.6 (about 7,000 miles per hour)-- a record for an air - breathing engine.