At the same time, the ramjet was showing promise for high-speed supersonic flight. From 1951 Napier developed a successful large-diameter experimental engine, the Napier Ram Jet (NRJ). Napier continued in ramjet development for several years, typically working alongside the English Electric aircraft design team.Sharp, Dan; British Secret Projects 5: Britain's Space Shuttle, Crécy, 2016, pp. 18–19.
At the same time the ramjet was showing promise for high-speed supersonic flight From 1951 Napier developed a successful large-diameter experimental engine the Napier Ram Jet (NRJ) Napier continued in ramjet development for several years typically working alongside the English Electric aircraft design teamSharp Dan; British Secret Projects 5 Britain's Space Shuttle Crécy 2016 pp 18–19