Nomainiet lielos iekšzemes lidmašīnas artitāna sakausējums
2006. gadā Valsts padome apstiprināja lielas gaisa kuģu shēmas demonstrācijas komitejas izveidi. Cao Chunxiao ir vienīgais dalībnieks, kas nodarbojas ar aviācijas materiālu izpēti. Pēc projekta uzsākšanas Cao Chunxiao darbojās kā ekspertu padomdevējas komitejas loceklis un ceļoja pa visu valsti. Lielais gaisa kuģu projekts aptver civilās un militārās lidmašīnas, un civilās lidmašīnas kods ir C919.
The less weight an airplane has, the better. The weight of the airplane itself is a percentage of its total take-off weight, which is called the "structural weight coefficient of the airplane". In the past 70 years, no aircraft has had a structural weight factor of less than 27 percent , which is due to the performance of large components and the manufacturing capacity of large components. Titanium material becomes the key. Titāna sakausējumsmateriāli un kalšanas tehnoloģija var samazināt lidaparātu strukturālo svaru un uzlabot tā konkurētspēju.
Today, the more economically demanding C919 uses 8 percent titanium, comparable to 7.5 percent of the Boeing 777 in the U.S. Large aircraft can not be manufactured without large forgings which require high technology. In the column "Academician's Introduction", Cao Chunxiao shows titāns forging joint for C919, named TC4, weighing 600 kg. To make similar forgings, China has built the world's largest 80,000-ton hydraulic press.
In November 2015, C919 with China's independent intellectual property rights was officially unveiled worldwide in Shanghai. Cao Chunxiao was thrilled at the scene and his dream of more than forty years came true at last.
2017. gada 5. maijā lidmašīna C919 veica pirmo veiksmīgo lidojumu Šanhajā. 2021. gada martā C919 veica pirmo pasūtījumu. Līdz 2022. gada sākumam C919 bija pieņēmis 815 pasūtījumus.
