Asendage suured kodumaised lennukid vastutitaani sulam
2006. aastal kiitis riiginõukogu heaks suure lennukiskeemi näidiskomitee loomise. Cao Chunxiao on ainus liige, kes tegeleb lennundusmaterjalide uurimisega. Pärast projekti käivitamist oli Cao Chunxiao ekspertide nõuandekomitee liige ja reisis üle kogu riigi. Suurlennukite projekt hõlmab tsiviil- ja sõjalennukeid ning tsiviillennukite kood on 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. Titaani sulammaterjalid ja sepistamistehnoloogia võivad vähendada õhusõidukite konstruktsioonikaalu ja parandada selle konkurentsivõimet.
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 titaan 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.
5. mail 2017 tegi reisilennuk C919 Shanghais oma esimese eduka lennu. 2021. aasta märtsis võttis C919 esimese tellimuse. 2022. aasta alguseks oli C919 vastu võtnud 815 tellimust.
