Thread by @Space_Josiah

I made and annotated a graph of Starship's ascent today, capturing the speed at every 1-second interval from the livestream telemetry, and it revealed some interesting things:
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First, we see a constant acceleration of ~6m/s^2. The best reason for this that I can see would be limiting aerodynamic loads on the early ascent, which is necessary because the flaps move the CoP much higher than it is on other rockets, which do not do this on ascent.
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(Falcon 9 pictured above)
The next piece is fairly straightforward, the throttle-down of the Raptors for Max-Q. This isn't as noticeable as it is on Falcon 9, most likely due to the previously mentioned aero limiting earlier in flight.
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Then we finally see about a minute of exponential increase in speed, meaning the booster is not trying to limit aero loads or g-forces at this point, and is just pushing forward at a constant throttle.
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Following this, we can see another period of constant acceleration as the rocket tries to limit g-forces before MECO. This can be seen on other rockets with a high TWR first stage, such as Antares:
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After this, we see the speed start to decrease as the booster shuts off 30 of the 33 engines in a staggered sequence for hot-staging to begin:
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https://twitter.com/i/status/1725870261738569968

After this is an interesting one, where SH gets pushed backwards by the force from SS's raptors, and experiences negative g-forces for a second, which (speculation) may have caused fuel slosh which ultimately killed it. Thanks to @DJSnM for originally pointing this out!
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Then we can see a "lump" in the graph, as SH fires its engines briefly upwards as part of the flip maneuver, and the the speed starts to slow down as it starts to reverse its trajectory back toward the launch site.
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The initial part of the boostback burn is performed at a constant acceleration of ~25m/s^2. Then, whatever caused the engines to go out kicks in, and we can see the acceleration slow as less and less engines are firing, before SH explodes in a spectacular cloud of vapor.
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I hope you found this thread interesting, and here's the clean graph without the markups for further inspection. Thanks for reading this random idea that I found compelling and therefore spent many hours of my Saturday on!
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