(launch site) At 10:44 on June 5, 2022, Beijing time, the long march 2F yao-14 carrier rocket carrying the Shenzhou 14 manned spacecraft ignited and launched at the Jiuquan Satellite Launch Center. On June 5, the long march 2F carrier rocket (hereinafter referred to as "Long March 2F rocket") developed by the China Academy of Launch Vehicle Technology (affiliated to China Aerospace Science and Technology Corporation, hereinafter referred to as "the rocket academy") launched the Shenzhou 14 astronauts into space. Since then, a series of tasks in the construction phase of China's space station have begun. After several expeditions, do you know what is special about the chang-2f rocket? The reporter invited rocket experts to interpret the difference of this "astronaut special train" for you. The longest time of "standing guard" On April 16, with the Shenzhou 13 manned spacecraft's return capsule slowly landing at the Dongfeng landing site, the Shenzhou 13 manned mission was a complete success, which also marked the end of the mission at the key technology verification stage of the Chinese space station. The launch of Shenzhou 14 by Chang 2F Yao 14 rocket is the first manned mission in the construction phase of the space station. "In order to further ensure the life safety of astronauts, the launch mode of 'one launch, one backup' and 'rolling backup' is adopted for the Rockets starting from the remote 12 and remote 13 of the Chang'er F." Qian hang, the software designer of the second f rocket failure inspection, introduced it. This year, the Chang 2F rocket will carry out two manned launch missions, still in accordance with the method of "one for combat and one for standby". As an emergency rescue rocket for Shenzhou 13 manned launch mission, the launched Chang'er fyao-14 rocket took the lead in completing the basic stage assembly test in the second half of last year, and was stored in the workshop of the technology zone in an upright state, witnessing the whole process of assembly test, transfer and launch of the "brother" Chang'er fyao-13 rocket. It was not until ZhaiZhiGang, Wang Yaping and yeguangfu, the three astronauts of the Shenzhou 13 flight crew, finished their 183 day space journey and successfully returned to earth that the Chang'er f Yao 14 ended its emergency duty for about six months and entered the emergency to normal launch process to prepare for the Shenzhou 14 manned launch mission. From "standing up and in place" to "handing over and changing posts", "standing" on duty for more than 6 months, coupled with the launch preparation time, the Chang 2F Yao 14 rocket has stood in the plant of the technology zone for nearly 10 months, the longest time of manned rockets in China. Highest reliability "In the history of China's manned space flight, the Chang 2F rocket has carried out all manned spacecraft and target aircraft launch missions from Shenzhou I to now, with a launch success rate of 100%, and is known as the 'Chinese Shenjian'. Therefore, the heavy burden of the Shenzhou 14 manned launch mission once again falls on the 'shoulders' of the Chang 2F rocket." Jing muchun, President of the second f rocket, said proudly. In order to further improve the reliability of the rocket and eliminate the weak links, the development personnel continue to make technical improvements. Each improvement reflects the rocket people's unremitting pursuit of reliability, and behind it means countless times of theoretical analysis, mathematical simulation and experimental verification. In this regard, Qin Zhen, the overall deputy chief designer of the chang'er-f rocket, was quite impressed: "it is conceivable that it will be difficult to improve it when the reliability is already quite high!" Chang Wuquan, the chief designer of the second F, the president of the rocket academy, used the test as an example: "it is relatively easy to raise the score from 50 to 90. Raising the score from 90 to 91 is no less than raising the score from 50 to 90." In order to strive for perfection, the more difficult the more forward. Finally, the rocket crew raised the reliability of the Chang 2F rocket from 0.97 to 0.9894, and the astronaut safety assessment value supported by the escape system has reached 0.99996 - in other words, only 100 rocket launches can lead to one flight failure; In case of flight failure, less than one escape failure may occur if the flight system escapes 100 times. The most precious load The Chang 2F rocket was first established in the manned spaceflight project, and its mission is also slightly special in the long march rocket family. If other rocket "brothers" can expand their territory in terms of weight and height, the Chang 2F rocket will devote more energy to improving itself - because its success or failure is related to life. This year, the Chang 2F rocket sent a total of six astronauts into space in the Shenzhou 14 and 15 crew as planned. After the completion of in orbit construction, the space station project will enter the application and development stage for more than 10 years. The preliminary plan is to launch two manned spacecraft and two cargo spacecraft every year. All these put forward higher requirements for the safety of rockets. "No matter how valuable the loads of other rockets are, they are valuable; while the loads of Chang 2F are astronauts, and their lives are priceless." Yi Yi, chief designer of the second f rocket, President of the rocket, has repeatedly stressed that "manned space flight is vital to human life". It is the special mission and responsibility of manned rocket developers to ensure the astronauts' safe entry into space. In order to ensure the life safety of astronauts, the Chang 2F rocket has specially designed an escape system: if the rocket has a sudden accident, the escape system will start immediately, and the escape aircraft will fly away from the faulty rocket with the return capsule like a "radish pulling"; Subsequently, the return capsule separated from the escape vehicle, the parachute opened, and the astronauts returned to the ground. "We have developed the rocket escape system according to the highest standards and the strictest quality, which embodies the painstaking efforts of generations of astronauts. However, it is the wish of every one of us never to enable this function, because it means that every manned launch mission can be successful." Qian hang said affectionately. The year 2022 will be the decisive year for China to complete the construction of the space station and the 30th anniversary of the establishment and implementation of China's manned space project. In the future, the Chang 2F rocket will surely live up to its mission, lift more astronauts into space and leave more Chinese figures in the vast universe. (Xinhua News Agency)