SpaceX, an American space exploration technology company, has successfully destroyed its prototype “test tank” sn7.1, and is ready to test the first full-scale high-altitude prototype SN8. After three nights and more than 20 hours of efforts, SpaceX finally filled hundreds of tons of liquid nitrogen into the spacecraft test tank sn7.1 before dawn on the 23rd. 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. Finally, sn7.1 exploded in the test, ending the long test activity. < / P > < p > a few hours later, a new closure notice indicated that SpaceX planned to move the Starship prototype SN8, the first full-scale prototype for high-altitude flight testing, to the launch site from its Boca Chica plant. < p > < p > due to the lack of new information from SpaceX or its CEO Elon Musk, little is known about the long testing process and results of sn7.1, but it survived two nights of testing without damage, clearing the way for SN8 to conduct suborbital testing. The preliminary conclusion drawn from the speculation and analysis of the consequence of sn7.1 explosion test shows that the tank test is fully in line with the expected assumption. < / P > < p > on the same day SpaceX started its final explosion test of the sn7.1 tank, the team installed functional flaps on a full-scale starship prototype (SN8) for the first time in its history. As of September 23, the SN8’s twin rear flaps (the large aerodynamic control surface used to help the Starship steadily and freely fall) were fully installed next to the “air hoods” protecting each flap control mechanism. Other hardware that has not yet been integrated includes a fairing about 20 meters high, two smaller front flaps, and piping for access to the smaller LOX tank located in the fairing. Currently, SpaceX has installed a prototype starship fairing on five non pressurized rings. However, SN8 has no LOX tank, which means SpaceX may need at least one to two days to weld one of the fairings to the LOX tank. In other words, SpaceX has little time to complete and install the proper fairing on the prototype in order to transport the SN8 to the launch pad. < / P > < p > doing so can reduce any inconvenience caused by failure when the acceptance test activities of the Starship SN8 are not carried out as planned. Considering that almost half of the flaps and their supporting structures are directly mounted on the shell of the LOX tank, the back flap and fairing of the Starship SN8 are likely to be necessary in the first major test of the spacecraft. Theoretically, the diameter of the stainless steel ring of SN8 may shrink by 0.3% when cooled to the temperature of liquid nitrogen or liquid oxygen. < p > < p > only half of SN8’s rear flaps are directly affected by tank shrinkage, which creates a relatively complex environment for such a large and high stress mechanical system. Therefore, testing flap action under low temperature load is likely to be the key part of SN8 low temperature resistance test, otherwise, it is necessary to prove the structural integrity and functionality of starship propellant tank. If SN8 enters the SpaceX launch facility as scheduled, the first low-temperature test of the spacecraft may start at 9:00 p.m. on Sunday, September 27. (small) < A= target=_ blank>It is said that “gta5” will be launched on Google cloud game platform stadia