National Aeronautics and Space Administration's Langley Research Centre and Accurate Automation of Tennessee, US are designing a 23-foot-long subsonic flyer model of a Mach 5
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/riding-waves-0
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/down-earth
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/transport
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/united-kingdom-uk