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musk < / a > just received two pieces of good and bad news. < / P > < p > the good news is that after the completion of the high altitude test mission of < strong > star ship prototype < / strong > Sn10, < strong > succeeded for the first time < a target = "_ blank" href=" https://news.163.com/news/search?keyword=%E7%9D%80%E9%99%86 "> landing < / a >! After blowing up eight < strong > starships (including two landing failures), Sn10 realized complex attitude control for the first time and landed steadily on the ground. < / P > < p > but < strong > eight minutes later < / strong >, < strong > bad news < / strong > came. < / P > < p > Sn10, which seems to have landed successfully and stood still, suddenly exploded < / P > < p > but musk is optimistic, celebrating a successful landing on the push, focusing on "Sn10's complete return". < / P > < p > the first successful landing of the starship is a milestone, and Musk's Mars dream is a small step closer. < / P > < p > △ successful landing! They did it! < / P > < p > but we are still curious, almost "perfect" Sn10, what happened? < / P > < p > < strong > the first successful landing of the Starship < / strong > < / P > < p > the original plan of the Starship was to take off at 4:14 a.m. (Note: here and below are Beijing time), but due to the computer suddenly abnormal, the engine ignition was stopped immediately. < / P > < p > the specific reason is that the computer detects that the thrust of one of the engines is too high. SpaceX < / a > quickly fixed this problem, and only three hours later, Sn10 was ready to take off again. At 7:15 a.m., Sn10 was launched from SpaceX South Texas base. < / P > < p > Sn10 reaches the altitude of 10km above the ground. < / P > < p > after reaching this altitude, the Starship hovered continuously, then all three Raptors' engines were shut down and entered a short free fall phase, with its abdomen facing the ground. < / P > < p > this stage is called the 95% free fall stage, also known as the "belly beat dive". Through the flaps of the ship, like the wing parachutists opening their hands and feet, to < a target = "_ blank" href=" https://news.163.com/news/search?keyword=%E7%81%AB%E7%AE%AD "> the rocket < / a > performs attitude control (pitch, roll, yaw, etc.) deceleration flight, which is the first series of actions of the star ship rocket. After < / P > < p >, Sn10 flipped again in the air, adjusting its attitude from horizontal to vertical before landing. < / P > < p > it's worth mentioning that the above flipped pictures are shot on the ground instead of CG, which looks like sci-fi movie pictures. Do you have such a misunderstanding? < / P > < p > finally, Sn10 slowly landed on its landing pad, but the arrow body tilted slightly to one side. < / P > < p > the whole process lasts about 6 minutes and 20 seconds. < / P > < p > seeing the successful picture, insprucker, SpaceX engineer and host of the launch live broadcast, announced excitedly on the spot: "as the saying goes, third time's a char". We have successfully made a soft landing on the ground. " < / P > < p > < strong > almost perfect, why? < / strong > < / P > < p > but the slight inclination during landing may have foreshadowed the explosion behind. < / P > < p > two SpaceX prototypes, SN8 and sn9, exploded in December last year and February this year. < / P > < p > this is because they are unable to slow down sufficiently before landing, resulting in huge impact when they contact the ground. < / P > < p > therefore, many space enthusiasts speculate on the cause of the explosion: the final tilt of the rocket was also caused by too much impact force, and the fuel tank of the Starship might break and leak, which eventually led to the explosion. < / P > < p > according to the previously leaked picture of Sn10 bracket, it has been deformed due to repeated impact, and this landing completely destroyed it. < / P > < p > at present, the official has not released the details of the explosion, and the specific reason can only wait for further investigation report. The result of the < / P > < p > explosion is really a big loss for SpaceX. But insprucker, a SpaceX engineer, said the main purpose of the test was to collect prototype data on how the flaps controlled the Starship to fall back to earth. As for landing, it's an additional mission. < / P > < p > therefore, space news website "orbital index" still believes that the rapid progress of SpaceX and the origin of blue should let < a target = "_ blank" href=" https://news.163.com/news/search?keyword=NASA "> NASA < / a > is ashamed. In 2014, NASA's director still ridiculed Falcon 9 as an armchair. Now the Starship prototypes have been iterating to the 10th generation. < p > < p > < strong > the path to Mars with twists and turns. < / P > < p > before Sn10, a total of eight starships were "martyred": < / P > < p > the first mark1 on November 20, 2019; < / P > < p > the second SN1 on February 28, 2020; < / P > < p > the third sn3 on April 2, 2020; < / P > < p > the fourth Sn4 on May 29, 2020; < / P > < p > the fifth sn7 on June 23, 2020; < / P > < p > the sixth sn7.1 on September 23, 2020; < / P > < p > the SN8 on December 9, 2020; < / P > < p > February 3, 2021 Sn9. < / P > < p > among them, there are not only ground ignition accidents, but also ship structure strength test accidents, and landing accidents. < / P > < p > by the way, when sn9 failed to land and "died" a month ago, it was next to Sn10, < / P > < p > watching < strong > Xiaojiu < / strong > blow up to pieces beside him, < strong > Xiaoshi < / strong > said that he was extremely scared at that time < / P > < p > in other words, it's really very difficult to achieve a rocket with super large carrying capacity, which can be used repeatedly at the same time. < / P > < p > there are many fatal risks in every test launch, such as resonance risk caused by maximum thrust of three raptors, risk of premature engine shutdown, structural instability caused by huge thrust, risk of front and rear wing failure caused by electrical failure, risk of engine and fuel tank valve failure < / P > < p > the success rate of SN8 and sn9 before landing and explosion given by musk is only 40%. < / P > < p > and this time Sn10, he said that the success rate was 60% < / P > < p > < strong > △ < / strong > the wreck of Sn10 < / P > < p > trial and error all the way, iteration all the way. According to Musk's expectation, only after testing SN20 at least, can it be expected to finalize the version 1.0 starship, that is, the mature version that can perform tasks. < / P > < p > and the target is 2021-2022. < / P > < p > according to this time line, we can watch the test flight of a star ship every 1-2 months on average in the future. < / P > < p > after Sn10, musk still has 10 chances.

后继者?
2023-03-22 10:04:29