SpaceX Tuesday...
Discussion
IN51GHT said:
Lobbing some meat up.........
Sounds like what a typical night out in W-S-M was hoping (but invariably didn't) end in.
Sounds like what a typical night out in W-S-M was hoping (but invariably didn't) end in.
When the ISS crew entered the Dragon capsule whilst it was docked, they all had googles/masks on. What exactly was that a precaution for? Not decompression I imagine.... If anything like that happened, anything short of a full EVA suit is going to help there. Some kind of contamination? Of what exactly, it came from Earth the day before!
Fonzey said:
When the ISS crew entered the Dragon capsule whilst it was docked, they all had googles/masks on. What exactly was that a precaution for? Not decompression I imagine.... If anything like that happened, anything short of a full EVA suit is going to help there. Some kind of contamination? Of what exactly, it came from Earth the day before!
DoubleSix said:
Missed today's events... where can I see a proper replay?
Undocking is here https://www.youtube.com/watch?v=2tSgej_7KYs The four black circles around the hatch are the Draco thrusters used for the deorbit burnDeorbit burn and landing https://www.youtube.com/watch?v=UhNl2o99CGc
Edited by MartG on Friday 8th March 19:17
MartG said:
DoubleSix said:
Missed today's events... where can I see a proper replay?
Undocking is here https://www.youtube.com/watch?v=2tSgej_7KYs The four black circles around the hatch are the Draco thrusters used for the deorbit burnDeorbit burn and landing https://www.youtube.com/watch?v=UhNl2o99CGc
Edited by MartG on Friday 8th March 19:17
For Crew Dragon, they are required by NASA to complete recovery within 60 minutes of splashdown, but they were 7 minutes outside of that.
One of the parachutes landed right on top of the capsule, which delayed the operation.
By way of reference, the Apollo capsules recovery periods ranged between 88 minutes (Apollo 13) and 188 minutes (apollo 11).They were towed to the waiting aircraft carrier and hoisted on to the flight deck.
The crew were picked up by helicopter well before that of course. The rescue period for them ranged between 37 minutes (Apollo 16) and 88 minutes (Apollo 8). Apollo 11's took 63 minutes.
Several of the capsules were found floating upside down due to the sea state, including Apollo 11. That must have been fun.The astronauts had inflatable buoys at the top of the capsule they could trigger to right themselves, but they didn't do that immediately, as they wanted everything to cool down first.
https://www.youtube.com/watch?v=0hX7AN3e1R4
https://history.nasa.gov/SP-4029/Apollo_18-40_Entr...
One of the parachutes landed right on top of the capsule, which delayed the operation.
By way of reference, the Apollo capsules recovery periods ranged between 88 minutes (Apollo 13) and 188 minutes (apollo 11).They were towed to the waiting aircraft carrier and hoisted on to the flight deck.
The crew were picked up by helicopter well before that of course. The rescue period for them ranged between 37 minutes (Apollo 16) and 88 minutes (Apollo 8). Apollo 11's took 63 minutes.
Several of the capsules were found floating upside down due to the sea state, including Apollo 11. That must have been fun.The astronauts had inflatable buoys at the top of the capsule they could trigger to right themselves, but they didn't do that immediately, as they wanted everything to cool down first.
https://www.youtube.com/watch?v=0hX7AN3e1R4
https://history.nasa.gov/SP-4029/Apollo_18-40_Entr...
The Orion also has those inflatable balloons. The tendency to end up upside down in the water is due to the shallow slope of the capsule shapes adopted by Orion and the Apollo Command Module. Mercury, Gemini and now Dragon spacecraft were/are far less likely to end up floating nose down in the water.
Both the Apollo Command Module and the Orion spacecraft are designed to withstand much higher re-entry heating than spacecraft such as the Dragon or Starliner. They were/are designed to withstand the higher temperatures experienced when returning from the moon or deeper space. A typical lunar mission re-entry is in the order of 25,000 mph as opposed to an earth orbit re-entry of just under 17,500 mph. That is the main reason why the cone shapes of the Command Module and Orion have a shallower slope compared to the Dragon. The shape of the plasma envelope around an Orion/CM is different because of the much higher re-entry speeds so the craft has to be shaped to keep the sides out of the hottest parts of the plasma plume that surrounds the vehicle during re-entry.
Both the Apollo Command Module and the Orion spacecraft are designed to withstand much higher re-entry heating than spacecraft such as the Dragon or Starliner. They were/are designed to withstand the higher temperatures experienced when returning from the moon or deeper space. A typical lunar mission re-entry is in the order of 25,000 mph as opposed to an earth orbit re-entry of just under 17,500 mph. That is the main reason why the cone shapes of the Command Module and Orion have a shallower slope compared to the Dragon. The shape of the plasma envelope around an Orion/CM is different because of the much higher re-entry speeds so the craft has to be shaped to keep the sides out of the hottest parts of the plasma plume that surrounds the vehicle during re-entry.
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