11 ms·

>The heatshield held out for a much longer time, the asymmetric heating on the flaps was interesting. I had guessed that all four flaps would have equivalent he

>The heatshield held out for a much longer time, the asymmetric heating on the flaps was interesting. I had guessed that all four flaps would have equivalent heating based on an approach that was basically that side of the rocket perpendicular to the flow but it seems like that isn't the case. Still it seems like they are close to having something workable here. Heat shielding didn't look relevant at this section of the flight at all. The booster didn't have any shielding.

Narishma 2y ago
They're talking here about Starship, not the booster.
- ninetyninenine 2y ago
  How does this logically make sense? They said "it looks like the heat shield held out". Where was a heat shield holding out?
  - kortilla 2y ago
    On starship. Believe it or not, Chuck’s comment was about both booster and starship
    - ninetyninenine 2y ago
      And I’m saying he’s wrong no heat shield held out to anything. The booster never travelled fast enough to need heat shielding ever. Only the starship needs it. If chuck is talking about both likely he doesn’t know what he’s talking about.
      - kortilla 2y ago
        Dude you are having trouble reading. His comment first talked about booster and then talked about starship. It’s not that difficult to follow.
caconym_ 2y ago
The booster actually does have heat shielding behind the engine bells, to protect against aerodynamic heating on the return. In some of today's footage you can see it glowing yellow. However, Raptor 3 is supposed to obviate the need for this shielding.
- ninetyninenine 2y ago
  Where did it glow yellow? What time in the video? The booster doesn’t travel fast enough to need heat shielding ever. It makes zero sense to use heat shielding behind the engine bells. Why? Think about it. If the booster renters the atmosphere engine bells first the engine bells would burn up BEFORE the air even touches the heat shield. If there are actually tiles there it’s just there to protect the booster from the heat of the exhaust. > However, Raptor 3 is supposed to obviate the need for this shielding. Not completely getting this. So there’s a case for the booster entering the atmosphere at orbital velocity engine bells first? I would think if they did this then THEY want the booster to burn up. Anything entering the atmosphere at that velocity needs to be made aerodynamically stable as it will be traveling faster then the speed of sound. This is what causes the heat. If you send something at the speed of sound engine bells first that’s not stable and is unlikely they will do that at all, with or without heat shielding. I don’t think parent knows what he’s talking about.
  - agar 2y ago
    > Where did it glow yellow? What time in the video? This is a better view than the sibling comment linked. It's a greater close-up and you can clearly see the yellow glow behind the engine bells. This view is from Cosmic Perspective, a partner of Everyday Astronaut, whose video is linked: https://www.youtube.com/live/pIKI7y3DTXk?si=LI4-xQ7UhnvITTiG&t=11542 https://www.youtube.com/live/pIKI7y3DTXk?si=LI4-xQ7UhnvITTiG... In case you get confused due to lack of context, the booster shot is a replay. When Tim goes to split-screen view, the right-side image is a live view of the second stage ("Starship") as it re-enters from orbital speed. It is not a different angle on the booster that is shown on the left. Later commentary explains that the heating behind the engine bells is due to atmospheric compression and SpaceX specifically orients the drop of the booster to focus heating in this spot.

Narishma 2y ago

They're talking here about Starship, not the booster.

ninetyninenine 2y ago
How does this logically make sense? They said "it looks like the heat shield held out". Where was a heat shield holding out?
- kortilla 2y ago
  On starship. Believe it or not, Chuck’s comment was about both booster and starship
  - ninetyninenine 2y ago
    And I’m saying he’s wrong no heat shield held out to anything. The booster never travelled fast enough to need heat shielding ever. Only the starship needs it. If chuck is talking about both likely he doesn’t know what he’s talking about.
    - kortilla 2y ago
      Dude you are having trouble reading. His comment first talked about booster and then talked about starship. It’s not that difficult to follow.

caconym_ 2y ago

The booster actually does have heat shielding behind the engine bells, to protect against aerodynamic heating on the return. In some of today's footage you can see it glowing yellow. However, Raptor 3 is supposed to obviate the need for this shielding.

ninetyninenine 2y ago
Where did it glow yellow? What time in the video? The booster doesn’t travel fast enough to need heat shielding ever. It makes zero sense to use heat shielding behind the engine bells. Why? Think about it. If the booster renters the atmosphere engine bells first the engine bells would burn up BEFORE the air even touches the heat shield. If there are actually tiles there it’s just there to protect the booster from the heat of the exhaust. > However, Raptor 3 is supposed to obviate the need for this shielding. Not completely getting this. So there’s a case for the booster entering the atmosphere at orbital velocity engine bells first? I would think if they did this then THEY want the booster to burn up. Anything entering the atmosphere at that velocity needs to be made aerodynamically stable as it will be traveling faster then the speed of sound. This is what causes the heat. If you send something at the speed of sound engine bells first that’s not stable and is unlikely they will do that at all, with or without heat shielding. I don’t think parent knows what he’s talking about.
- agar 2y ago
  > Where did it glow yellow? What time in the video? This is a better view than the sibling comment linked. It's a greater close-up and you can clearly see the yellow glow behind the engine bells. This view is from Cosmic Perspective, a partner of Everyday Astronaut, whose video is linked: https://www.youtube.com/live/pIKI7y3DTXk?si=LI4-xQ7UhnvITTiG&t=11542 https://www.youtube.com/live/pIKI7y3DTXk?si=LI4-xQ7UhnvITTiG... In case you get confused due to lack of context, the booster shot is a replay. When Tim goes to split-screen view, the right-side image is a live view of the second stage ("Starship") as it re-enters from orbital speed. It is not a different angle on the booster that is shown on the left. Later commentary explains that the heating behind the engine bells is due to atmospheric compression and SpaceX specifically orients the drop of the booster to focus heating in this spot.