SpaceX has released a 4K recap of Starship serial number 8’s (SN8) spectacular high-altitude launch introduction, highlighting all crucial facets of the exceptionally successful test flight and also hinting in the upcoming steps forward.
On December 9th, following times of expectancy and waits for its unprecedented test flight, Starship SN8 spanned through a clean preflight leak, grabbed three Raptor engines, and raised off around 4:45 pm CST – only 15 minutes prior to the launch window had been scheduled to close. In a movement that could later be confirmed to be intentional, Starship’s ascent went just as intended with three Raptors sequentially shut down over the course of almost five minutes – needed, stated Elon Musk, keep the rocket from “[blowing off ] throughout the [12.5-kilometer] altitude limit. ”
Although technical difficulties prevented a high-altitude NASA reconnaissance jet from shooting aerial footage of this scene from up high, SpaceX surely appears to have made do with more mundane platforms, shooting all parts of Starship SN8’s launch in high definition.
12 story rocket turns off its search engines & does a controlled drop https://t.co/HCRgyx42rn
— Elon Musk (@elonmusk) December 24, 2020
Probably reaching speeds of around 150 m/s (~330 miles ) during this freefall, Starship SN8 made it seem simple, twitching its flaps and sometimes employing a burst of thrusters to and stably slip back to around 1 km (~0.6 mi) above the ground. At that stage, the rocket ignited one – after which two – Raptor engines with no clear issue, gimballing liberally and firing thrusters to reverse its 9m by 50m (30 feet by 165 feet ) hull ~120 levels in a small number of seconds, ending in a tail-down landing configuration.
Up to this stage, more than half an hour into the flight test, Starship SN8 had but aced the gauntlet of firsts SpaceX had pitched at it, especially surpassing CEO Elon Musk’s anticipation of a successful ascent but otherwise failed descent.
Freefall descent, driven warrior, along with a somewhat hard “landing”. (SpaceX)
Instead, SN8 left it only a two or two seconds away from a soft landing until things went wrong. According to Musk, who remarked after the truth the Starship’s fuel (methane) header tank – a tiny secondary tank used to store landing propellant at large pressures – began to display lower than needed pressures in the seconds before touchdown. Whether intentional or not, among the 2 Raptors sparked through SN8’s reverse move closed down around ten seconds after, at which stage the only remaining engine throttled up only to have its plume turn an almost green.
Minor
— Elon Musk (@elonmusk) December 24, 2020
Essentially, without sufficient pressure in the fuel header, Raptor’s combustion turned very oxygen-rich, dramatically ramping up the warmth and actually melting the engine’s copper-rich combustion chamber liner (hence the green hue). Had this tank already been in a position to maintain stress, it’s reasonable to assume that SN8 could have stuck a soft landing exactly like SN5 and SN6 failed a couple of months before. Luckily, Musk says the origin of the anxiety difficulty was “small ” and, as SpaceX notes in the close of the recap, Starship SN9 is nearly ready to carry the torch forward.
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