What kind of logic do you think we would not even be able to develop and manufacture a normal screws?
The development of an complex high performance engine takes 8-10 years on average, why should this period be different for Turkey?
Are you perhaps suffering from a feeling of inferiority that only the USA, EU and Asia can develop high technology and Turkey should not try?
Thank God there are more people who have the faith and the will to research develop, otherwise we would be a country of absolute backwardness like Afghanistan.
People like them who don't believe in their own abilities have hindered the country's self-esteem for decades. Nation and people alike become successful when they achieve things and this is achieved step by step. If you can't handle that, you shouldn't read any more news in the Defense Industry.
I don't know of any country in the world that hasn't had the same difficulties producing their own high performance engine and the key to the solution is time and perseverance.