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Why is Starship performing a coup maneuver?

Source: Everyday Astronaut
Source: Everyday Astronaut

Starship is performing maneuvers that have never been done before. It is a rocket 9 m wide and 50 m high, which falls horizontally from the sky, then flips over and lands vertically.





Landing attempts raised many questions:





  • Why are they doing this maneuver?





  • Why are they doing this maneuver so close to the ground?





  • Will it ever be safe enough for humans?





  • Why don't they just start the maneuver early and make sure there is enough time to make adjustments if something goes wrong?





  • Are the resulting overloads acceptable?





  • SpaceX Falcon 9?





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Starship tanks arrangement. Source: C-Bass Productions
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Starship falls belly down, indicating that gravity is equal to drag (top speed). Source: Everyday Astronaut
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Comparison of engine ignition speeds for Flacon 9 and Starship. Source: Declan Murphy, Everyday Astronaut
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Starship surface area: horizontal vs. vertically. Source: Everyday Astronaut
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The rocket hangs at a thrust-to-weight ratio (PTW) of 1: 1. Source: Everyday Astronaut
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A rocket with a thrust-to-weight ratio (PWR) of 1: 1 after the start of downward acceleration. Source: Everyday Astronaut
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Graphs of efficiency and final acceleration during engine ignition. Source: Everyday Astronaut
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The total thrust of different numbers of Raptor engines on the Starship. Source: Everyday Astronaut
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The different height at which Starship flips and the corresponding delta-v requirements. Source: Declan Murphy, Everyday Astronaut
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Starship acceleration (G) on landing from SN10 flight profile. Source: Declan Murphy, Everyday Astronaut
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The relative movement of the Starship's nose compared to its tail. Source: Everyday Astronaut
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