Skiptu út stórum innanlandsflugvélum fyrirtítan ál
Árið 2006 samþykkti ríkisráðið stofnun sýningarnefndar stórra loftfara. Cao Chunxiao er eini meðlimurinn sem stundar rannsóknir á flugefni. Eftir að verkefnið var hleypt af stokkunum starfaði Cao Chunxiao sem meðlimur í ráðgjafanefnd sérfræðinga og ferðaðist um landið. Stóra flugvélaverkefnið nær til borgaralegra flugvéla og herflugvéla og kóði borgaralegra flugvéla er 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. Títan álfelgurefni og smíðatækni geta dregið úr byggingarþyngd flugvéla og bætt samkeppnishæfni þeirra.
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 títan 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.
Þann 5. maí 2017 fór C919 farþegaþotan í fyrsta farsæla flugið í Shanghai. Í mars 2021 tók C919 fyrstu pöntunina. Í byrjun árs 2022 hafði C919 tekið 815 pantanir.
