Starship SN9: How SpaceX Solved Landing Crash Problem Of SN8?

SpaceX is preparing Starship SN9 for the second high altitude flight test launch.
Starship SN9 was in position on its Launchpad. On December 28 2020-spacex conducted ground tests like: ambient temperature, pressure tests . These tests involved filling the Starship's propellent tanks with benign air-temperate nitrogen gas and checking for leaks and verifying the structural integrity under normal conditions.
Starship SN9 appeared to pass with flying colors.
These tests were then followed by the more dramatic cryogenic proof testing of the craft 29 december .
.On 6th January 2020- static fire test was conducted with three raptor engines and then starship sn9 will be ready for the second high altitude flight test of a starship prototype.
The flight profile of Starship SN9 is likely to follow closely the previous Starship SN8 hop test.
However, SpaceX took just two weeks to start testing for Starship SN9. It seems that SpaceX have found a solution for the methane header tank's pressure drop which caused the failure of Starship SN8.

Elon & SpaceX expects that – by pressurizing SN9’s header tanks with helium for this flight, it should prevent them from losing pressure like the methane header tank did during SN8’s flight .We know that helium is an inert gas which does not react with other elements under normal condition . This makes helium a very good candidate to maintain pressure. Currently there are 2 challenges in using helium. Number one, helium is heavy- the helium crutch adds additional weight to the engine. Number two, helium is expensive.

we can just hope that the helium will do the trick and hopefully we will see starship sn9 successfully complete the 12.5 kilometer test flight. The exact launch time may not be known until just a few minutes before launch-but it is expected to launch on 8th Jnauary.
Along with SN9, it's successors Starship SN10 and SN11 are coming along nicely. SN10 is currently in high bay along with Super Heavy BN1 and SN11 is in mid bay. 2021 is going to be full of high altitude flight test and hopefully, orbital test flight as well!

2021 is surely going to be full of altitude flight tests and if everything goes according to plan we may see orbital flight test as well.
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