What part of "a non-functioning prototype" don't you understand?
Literally anyone can make a prototype jet engine. The metallurgy and process to make a functioning one is several orders of magnitude more difficult. Which is why... China still buys the vast, vast majority of their jet engines from Russia for military use. And their commercial passenger jets use engines from CFM.
Literally anyone can make a prototype jet engine. The metallurgy and process to make a functioning one is several orders of magnitude more difficult. Which is why... China still buys the vast, vast majority of their jet engines from Russia for military use. And their commercial passenger jets use engines from CFM.