This one tells about how the Germans and British were almost simultaneously inventing the jet: https://www.thoughtco.com/history-of-the-jet-engine-4067905 https

This one tells about how the Germans and British were almost simultaneously inventing the jet: https://www.thoughtco.com/history-of-the-jet-engine-4067905 https://www.thoughtco.com/history-of-the-jet-engine-4067905 This one tells of Whittle's difficulties in Air Force resistance, also the new jets were extremely costly and required whole new areas of metallurgy and turbine design: https://frankwhittle.co.uk/challenges/ https://frankwhittle.co.uk/challenges/