Musk’s SpaceX, again. However, this is a special explosion test to understand and study the pressure limit of 304L stainless steel fuel tank. At the same time, it also prepares for the flight test of SN8. On the 23rd, after 92 hours of testing, Musk’s prototype sn7.1 finally exploded. < / P > < p > sn7.1 is a test tank, not a full-size prototype, which is mainly used to test the pressure resistance of new materials. In other words, sn7.1 is to carry out the limit test, until the explosion, we can know how much its ultimate withstand voltage value is. Before the test, sn7.1 had been tested for many times, including low temperature test, but the test results were not disclosed too much. However, according to foreign media, SpaceX closely tests the stress conditions of dome, weld, structure and other parts to obtain detailed experimental parameters. < / P > < p > an interesting detail is that during the first pressure test of sn7.1, a spot robot dog appeared on site, which was designed to be used for starship testing. < p > < p > Videos circulating on social media show that the $75000 robot dog “entered the scene filled with rich nitrogen and went to the tilted fuel tank to collect scientific research data. < / P > < p > then, with only one hour left in the test window, SpaceX closed the vent of the tank, allowing the cryogenic liquid inside to boil into gas and expand. The explosion of SpaceX is nothing new to musk, but Musk’s ultimate goal is to send humans to Mars. Therefore, we must do a lot of flight test before going to Mars, and pay more attention to the durability and safety of the spacecraft. < / P > < p > according to Musk’s idea, the “starship” would be designed as a 180 foot (55 meter) spacecraft that would orbit on a rocket booster about 220 feet high. The spacecraft was designed to refuel in low earth orbit to transport 100 passengers and more than 100 tons of cargo to Mars at a time. In December 2018, musk said of the change: “starships will look like liquid silver.” He added that the spacecraft would use mirror polishing to help reflect heat – a really cool element. < / P > < p > by weight, the price of steel is about 67 times that of carbon fiber composites. Steel is also easier to process than carbon fibers, allowing faster prototypes and better withstand high temperatures. < / P > < p > more importantly, when steel comes into contact with ultracold liquids, its strength increases by 50%, including the cryogenic methane and oxygen that starships may use to propel itself in space. < p > < p > therefore, the stainless steel used in the Starship spacecraft will be made into a double-layer mechanism, and special micropores will be designed in the middle, and then bonded with special materials. At the same time, the micropores between the stainless steel can slowly release water or fuel during the flight of the spacecraft, and reduce the surface temperature of the spacecraft through the principle of evaporative cooling. < / P > < p > after all, this is a flying monster with a height of 50 meters, a diameter of 9 meters, a weight of hundreds of tons and a thrust of more than 600 tons. It is not easy to deduce an aerodynamic aviation trip with a maximum flight altitude of 20 km. < / P > < p > according to musk, unlike the headless SN5 and SN6 versions, the SN8 will be a near final starship. In addition to the interior and engine, the exterior structure is already the final version. What’s more, unlike SN5 and SN6 leaving the ground, SN8 has to fly 18 kilometers to prepare for subsequent re-entry and flight on other planets. < / P > < p > according to the previously published data, SN8 will have a height of nearly 50 meters, a diameter of 9 meters, and a dry weight of about 85 tons. It will be equipped with three Raptor engines, each with a thrust of about 225 tons. < / P > < p > the in orbit version of the Starship will be equipped with seven Raptor engines, while the next will be the super heavy Falcon rocket, which will be equipped with 28 latest Raptor engines. The superior of the star ship will be sent to earth orbit by the subordinate super heavy falcon, and then the star ship will be refuelled in orbit, and then it will fly to Mars. < p > < p > it is reported that SN8 will also undergo the same early test, static ignition and other ground inspection preparatory work, followed by another static ignition test before the final attempt to fly to 60000 feet above sea level and return to the ground to complete controlled landing. < / P > < p > and according to a document SpaceX recently submitted to the Federal Communications Commission (FCC), the company hopes to conduct a test flight some time after October 11. < / P > < p > according to the plan, it is still necessary to iterate to SN20 before starship is actually built. These iterations should be completed within three years, and musk is under great pressure. Privacy Policy