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Starship's Fourth Flight Test [video]

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Re: Starship's Fourth Flight Test [video]

#91
the video from the booster simulated landing in the ocean was incredible! It came in and did a soft landing vertically just touching the ocean, engines cut, it appeared to be floating for a second and then just kind of slowly fell over.

I did not think they would nail the booster landing this flight, as it was not stable all the way down on the last flight. Absolutely incredible watching this live

edit : video clip : https://x.com/SpaceX/status/1798701489097183286

Re: Starship's Fourth Flight Test [video]

#92

Curious - I was watching the live stream, and noticed as the ship's rockets were on, there were a bunch of these "floaters" in the view. https://imgur.com/a/OrZTYxP I know nearly nothing about rocketry, so ELI5 (or give me a wikipedia link!)... anyone know what those floaters are? Is it some byproduct of the fuel? An artifact of the cameras? An illusion coming through the haze of the burning rocket?

Heat tiles and or ice falling off

Re: Starship's Fourth Flight Test [video]

#93

Curious - I was watching the live stream, and noticed as the ship's rockets were on, there were a bunch of these "floaters" in the view. https://imgur.com/a/OrZTYxP I know nearly nothing about rocketry, so ELI5 (or give me a wikipedia link!)... anyone know what those floaters are? Is it some byproduct of the fuel? An artifact of the cameras? An illusion coming through the haze of the burning rocket?

Ice of some sort

Re: Starship's Fourth Flight Test [video]

#94

Curious - I was watching the live stream, and noticed as the ship's rockets were on, there were a bunch of these "floaters" in the view. https://imgur.com/a/OrZTYxP I know nearly nothing about rocketry, so ELI5 (or give me a wikipedia link!)... anyone know what those floaters are? Is it some byproduct of the fuel? An artifact of the cameras? An illusion coming through the haze of the burning rocket?

Chunks of ice falling off the sides of the ship where the cryogenic fuel caused atmospheric water to freeze onto it.

Re: Starship's Fourth Flight Test [video]

#95

Curious - I was watching the live stream, and noticed as the ship's rockets were on, there were a bunch of these "floaters" in the view. https://imgur.com/a/OrZTYxP I know nearly nothing about rocketry, so ELI5 (or give me a wikipedia link!)... anyone know what those floaters are? Is it some byproduct of the fuel? An artifact of the cameras? An illusion coming through the haze of the burning rocket?

that is mostly ice. The propellent is super chilled so ice forms on the whole outside of the rocket, and then comes off during the launch and in flight.

You can also see this on the Atlas 5 + starliner launch from yesterday to a lesser degree

Re: Starship's Fourth Flight Test [video]

#99
post #98
post #96

Was this the booster passing up the hot staging ring? https://imgur.com/a/uFAwJG1

I saw that too. And it must be; it strains reason to think there was some other piece of space junk at exactly the same place and speed.

Of course. I just expected them to fall at the same rate.

Re: Starship's Fourth Flight Test [video]

#100
post #57

As noted by chat in EDA stream, Max Q is projected to be 10s later than previous tests: grep -i 'max q' ift* | sed -e 's;^; ;' ift2-timeline.csv:00:00:52 Max Q (moment of peak mechanical stress on the rocket) ift3-timeline.csv:00:00:52 Max Q (moment of peak mechanical stress on the rocket) ift4-timeline.csv:00:01:02 Max Q (moment of peak mechanical stress on the rocket)

None of the past tests has reached orbit (IFT3 got to orbital altitude, but not orbital velocity), so I believe SpaceX is essentially a projection that they will reach orbit this time.

Max q is not orbital speed or height.

The max q, or maximum dynamic pressure, condition is the point when an aerospace vehicle's atmospheric flight reaches the maximum difference between the fluid dynamics total pressure and the ambient static pressure.

https://en.wikipedia.org/wiki/Max_q

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