SpaceX Tuesday...
Discussion
Eric Mc said:
This pop star even sang about it -
https://www.youtube.com/watch?v=gWPYmSRP110
WARNING - this could be the creepiest video ever posted on PH.
And we're back to pedo cave divers again. https://www.youtube.com/watch?v=gWPYmSRP110
WARNING - this could be the creepiest video ever posted on PH.
Or this...
https://www.youtube.com/watch?v=eyiVSBAq2Nw
Eric Mc said:
Is this supposed to be the first circumlunar flight with this spacecraft? Would there be an unmanned test flight first - or a flight undertaken with a test crew only?
In aviation and space it has long been axiomatic that in the early stages of development of an aircraft or spacecraft, you only risk the lives of the professional people involved in the project i.e. the test pilots and test crew (if a crew is required).
As with a lot of Musk "propaganda", the nitty gritty detail is missing.
Perhaps the fact that it's a commercial operation Eric......In aviation and space it has long been axiomatic that in the early stages of development of an aircraft or spacecraft, you only risk the lives of the professional people involved in the project i.e. the test pilots and test crew (if a crew is required).
As with a lot of Musk "propaganda", the nitty gritty detail is missing.
MartG said:
https://spacenews.com/commercial-crew-providers-be...
"A key issue in the development of Boeing’s CST-100 Starliner and SpaceX’s Crew Dragon has been their ability to meet a “loss-of-crew” requirement — a measure of the probability of death or permanent disability of one or more people on a spacecraft during a mission — of 1 in 270. The companies have faced problems meeting that requirement, significantly more stringent than that of the space shuttle."
1 in 270, not sure I'd like those odds!"A key issue in the development of Boeing’s CST-100 Starliner and SpaceX’s Crew Dragon has been their ability to meet a “loss-of-crew” requirement — a measure of the probability of death or permanent disability of one or more people on a spacecraft during a mission — of 1 in 270. The companies have faced problems meeting that requirement, significantly more stringent than that of the space shuttle."
Caruso said:
MartG said:
https://spacenews.com/commercial-crew-providers-be...
"A key issue in the development of Boeing’s CST-100 Starliner and SpaceX’s Crew Dragon has been their ability to meet a “loss-of-crew” requirement — a measure of the probability of death or permanent disability of one or more people on a spacecraft during a mission — of 1 in 270. The companies have faced problems meeting that requirement, significantly more stringent than that of the space shuttle."
1 in 270, not sure I'd like those odds!"A key issue in the development of Boeing’s CST-100 Starliner and SpaceX’s Crew Dragon has been their ability to meet a “loss-of-crew” requirement — a measure of the probability of death or permanent disability of one or more people on a spacecraft during a mission — of 1 in 270. The companies have faced problems meeting that requirement, significantly more stringent than that of the space shuttle."
MartG said:
Caruso said:
MartG said:
https://spacenews.com/commercial-crew-providers-be...
"A key issue in the development of Boeing’s CST-100 Starliner and SpaceX’s Crew Dragon has been their ability to meet a “loss-of-crew” requirement — a measure of the probability of death or permanent disability of one or more people on a spacecraft during a mission — of 1 in 270. The companies have faced problems meeting that requirement, significantly more stringent than that of the space shuttle."
1 in 270, not sure I'd like those odds!"A key issue in the development of Boeing’s CST-100 Starliner and SpaceX’s Crew Dragon has been their ability to meet a “loss-of-crew” requirement — a measure of the probability of death or permanent disability of one or more people on a spacecraft during a mission — of 1 in 270. The companies have faced problems meeting that requirement, significantly more stringent than that of the space shuttle."
Caruso said:
MartG said:
https://spacenews.com/commercial-crew-providers-be...
"A key issue in the development of Boeing’s CST-100 Starliner and SpaceX’s Crew Dragon has been their ability to meet a “loss-of-crew” requirement — a measure of the probability of death or permanent disability of one or more people on a spacecraft during a mission — of 1 in 270. The companies have faced problems meeting that requirement, significantly more stringent than that of the space shuttle."
1 in 270, not sure I'd like those odds!"A key issue in the development of Boeing’s CST-100 Starliner and SpaceX’s Crew Dragon has been their ability to meet a “loss-of-crew” requirement — a measure of the probability of death or permanent disability of one or more people on a spacecraft during a mission — of 1 in 270. The companies have faced problems meeting that requirement, significantly more stringent than that of the space shuttle."
They've refitted Pad 39a's emergency egress basket system. As seen here in 2012:
https://www.youtube.com/watch?v=TGMWdtQYkbc
For Falcon 9 use, they've mounted it about 60 feet higher than for the Shuttle program. So even more of a wild ride.
The one for the much taller Saturn V must have been something else.
https://www.youtube.com/watch?v=TGMWdtQYkbc
For Falcon 9 use, they've mounted it about 60 feet higher than for the Shuttle program. So even more of a wild ride.
The one for the much taller Saturn V must have been something else.
Good article on the pressure days of the falcon 1
https://arstechnica.com/science/2018/09/inside-the...
https://arstechnica.com/science/2018/09/inside-the...
Landing large heavy objects on the surface of Mars is a very, very difficult nut to crack. The largest object so far that has been safely landed on the surface is the Curiosity Rover which weighed about the same as a VW Golf.
The problem is that their isn't enough atmosphere to provide sufficient aerodynamic braking but enough to cause heating. You still need rocket power to gently put down. Because the atmosphere is so thin, the reliance on rocket thrust to land is greater so more fuel is needed to slow down compared to earth.
Building a spacecraft that is capable of both entering earth's atmosphere and landing and one that can do the same on Mars is not going to be easy. I wonder what techniques SpaceX have come up with. They haven't divulged that type of detail yet, as far as I am aware.
The problem is that their isn't enough atmosphere to provide sufficient aerodynamic braking but enough to cause heating. You still need rocket power to gently put down. Because the atmosphere is so thin, the reliance on rocket thrust to land is greater so more fuel is needed to slow down compared to earth.
Building a spacecraft that is capable of both entering earth's atmosphere and landing and one that can do the same on Mars is not going to be easy. I wonder what techniques SpaceX have come up with. They haven't divulged that type of detail yet, as far as I am aware.
It the presentation last year Elon said they expect to be able to scrub off over 99% of the velocity aerodynamically. As you say, it'll be coming in hot (7.5 km/s initially), so there will be some ablation of the heat shield compared to an Earth re-entry.
We know they plan to in-space-refuel the Mars-bound BFS first with up to three dedicated BFS tanker flights each (depending on the payload). So it will have the fuel for a propulsive landing.
Mars also has 38% lower gravity than the Earth , so that's a help. It won't need the BFR booster to get back off Mars either.
We know they plan to in-space-refuel the Mars-bound BFS first with up to three dedicated BFS tanker flights each (depending on the payload). So it will have the fuel for a propulsive landing.
Mars also has 38% lower gravity than the Earth , so that's a help. It won't need the BFR booster to get back off Mars either.
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