Technology, Science and the Environment.

[SpacedX]

So it seems that the chilldown problem was indeed a defective sensor and nothing inherently wrong with the engines. 

 

NASA have said that there is a 70% of favourable weather during the launch window which opens at 19.17 GMT. Another scrub and the next available window is Monday.

 

Godspeed Campos, Helga and Zohar!

Edited 3 September 2022 by Line-X

[leicsmac]

Another H2 leak...

[leicsmac]

And scrubbed. Monday the next opportunity.

[SpacedX]

14 minutes ago, leicsmac said:

Monday the next opportunity.

Do you know when the window is? This is the launch availability according to NASA:

 

August 23 – September 6 

12 launch opportunities 

No launch availability on August 30, 31, and Sept. 1

 

September 19 – October 4 

14 launch opportunities 

No launch availability on Sept. 29 and Sept. 30

 

October 17 – October 31 

11 launch opportunities 

No launch availability on October 24, 25, 26, and 28 

 

November 12 – November 27 (preliminary) 

12 launch opportunities 

No launch availability on November 20, 21, and 26 

 

December 9 – December 23 (preliminary) 

11 launch opportunities 

No launch availability on December 10, 14, 18, and 23

 

But I have no idea when the two hour windows are. 

 

Orbital mechanics aside, I'm sure that there also is an operational constraint driven by infrastructure at KSP. Because of their size, the sphere-shaped tanks used to store cryogenic propellant at the launch pad can only supply a limited number of launch attempts. Liquid oxygen and liquid hydrogen are loaded in the rocket’s core stage and upper stage on the day of launch. In the event of the scrub, there is a minimum of 48 hours until a second launch attempt can be made. Isn't there a 72-hour minimum before a third attempt can be made which is why I'm surprised that there is talk of Monday or even tomorrow. This is due to the need to resupply the cryogenic storage sphere with more propellant. In any given week, no more than three launch attempts that include core stage tanking can take place - so that's ok but given that this is the third, I'm surprised that it can be attempted as soon as Monday due to the logistical constraints at the Cape. Also, interestingly, the core stage can only withstand around twenty fuelling cycles. I have a feeling that with the WDRs this now stands at six. 

[leicsmac]

17 minutes ago, Line-X said:

Do you know when the window is? This is the launch availability according to NASA:

 

August 23 – September 6 

12 launch opportunities 

No launch availability on August 30, 31, and Sept. 1

 

September 19 – October 4 

14 launch opportunities 

No launch availability on Sept. 29 and Sept. 30

 

October 17 – October 31 

11 launch opportunities 

No launch availability on October 24, 25, 26, and 28 

 

November 12 – November 27 (preliminary) 

12 launch opportunities 

No launch availability on November 20, 21, and 26 

 

December 9 – December 23 (preliminary) 

11 launch opportunities 

No launch availability on December 10, 14, 18, and 23

 

But I have no idea when the two hour windows are. 

 

Orbital mechanics aside, I'm sure that there also is an operational constraint driven by infrastructure at KSP. Because of their size, the sphere-shaped tanks used to store cryogenic propellant at the launch pad can only supply a limited number of launch attempts. Liquid oxygen and liquid hydrogen are loaded in the rocket’s core stage and upper stage on the day of launch. In the event of the scrub, there is a minimum of 48 hours until a second launch attempt can be made. Isn't there a 72-hour minimum before a third attempt can be made which is why I'm surprised that there is talk of Monday or even tomorrow. This is due to the need to resupply the cryogenic storage sphere with more propellant. In any given week, no more than three launch attempts that include core stage tanking can take place - so that's ok but given that this is the third, I'm surprised that it can be attempted as soon as Monday due to the logistical constraints at the Cape. Also, interestingly, the core stage can only withstand around twenty fuelling cycles. I have a feeling that with the WDRs this now stands at six. 

Looks like my information is out of date - yesterday I read that a third attempt would be made on Monday, but now it does look like simply TBD. As you say, that would seem like too quick a turn-around time.

 

Also regarding the bolded:

 

[SpacedX]

Just now, leicsmac said:

Looks like my information is out of date - yesterday I read that a third attempt would be made on Monday, but now it does look like simply TBD. As you say, that would seem like too quick a turn-around time.

 

Also regarding the bolded:

 

Christ, I've got Kerbal on the brain 

 

Sorry, KSC. 

[Zear0]

4 minutes ago, Line-X said:

Christ, I've got Kerbal on the brain 

 

Sorry, KSC. 

Hope you don't have as much green blood on your hands as I do.

[leicsmac]

1 minute ago, Zear0 said:

Hope you don't have as much green blood on your hands as I do.

Speaking personally, I'm normally sharp enough to be able to F9 out before things go totally Pete Tong.

 

Of course, that isn't always the case.

[SpacedX]

From Space.com:

 

NASA currently has a 90-minute window to launch Artemis 1 on Monday, with liftoff occurring at 5:12 p.m. EDT (2212 GMT). If the agency doesn't try to launch Monday, it could try on Tuesday (Sept. 6), but the launch window is slim, just 24 minutes. A Tuesday launch, if attempted, would occur at 6:57 p.m. EDT (2257 GMT), NASA has said.

[leicsmac]

Back to the VAB it is, then. No launch until mid-October earliest. Damn.

[leicsmac]

https://phys.org/news/2022-09-china-hottest-august-began.html

 

https://phys.org/news/2022-09-lake-urmia-fully-iran-wetlands.html

 

https://phys.org/news/2022-09-chance-california-power-outages-worsens.html

 

[leicsmac]

https://www.bbc.com/news/science-environment-62833937

 

As above.

[WigstonWanderer]

I have absolutely no doubt that the overall world response to the climate crisis will be woefully inadequate, governed by short term thinking and greed. If only we’d started on the problem 30 years ago, when evidence was mounting. Like an asteroid heading for earth, if sufficiently far away, even a relatively small jolt will alter the trajectory sufficiently to avoid a collision. Our only hope now is Bruce Willis, and I don’t think he’s in good shape.

Edited 8 September 2022 by WigstonWanderer

[leicsmac]

7 minutes ago, WigstonWanderer said:

I have absolutely no doubt that the overall world response to the climate crisis will be woefully insufficient, governed by short term thinking and greed. If only we’d started on the problem 30 years ago, when evidence was mounting. Like an asteroid heading for earth, if sufficiently far away, even a relatively small jolt will alter the trajectory sufficiently to avoid a collision. Our only hope now is Bruce Willis, and I don’t think he’s in good shape.

I hope that you're wrong.

 

I fear that, given current evidence, you're not.

 

The worst part is, as you infer, that the future dire consequences are all so needless. Well, if things do end up going horrible, perhaps the names and ideology of those responsible can be committed to posterity and remembered along with the worst historical figures, so that it might never happen again (if humanity is still in any kind of position to enforce it, of course).

[WigstonWanderer]

This doesn’t sound good.

 

https://www.theguardian.com/environment/2022/sep/08/world-on-brink-five-climate-tipping-points-study-finds

[leicsmac]

5 minutes ago, WigstonWanderer said:

This doesn’t sound good.

 

https://www.theguardian.com/environment/2022/sep/08/world-on-brink-five-climate-tipping-points-study-finds

"There can be no more hiding, and no more denying. Global heating is supercharging extreme weather at an astonishing speed, and it’s visible in Korea and beyond. Guardian analysis recently revealed how human-caused climate breakdown is accelerating the toll of extreme weather across the planet. People across the world are losing their lives and livelihoods due to more deadly and more frequent heatwaves, floods, wildfires and droughts triggered by the climate crisis."

 

The Grauniad have it spot on here. But people still consider the threat abstract as it isn't right in their faces. Yet.

[Bellend Sebastian]

More great news

 

https://www.theguardian.com/science/2022/sep/10/cancer-breakthrough-is-a-wake-up-call-on-danger-of-air-pollution

 

[leicsmac]

[The Bear]

Tipping points aren't just a crappy TV game show. Feels like we're getting to see one or two of them in the data. 

[Dahnsouff]

Don’t think scientists alone turn this one around, it requires global consensus and no chance of that

[leicsmac]

13 minutes ago, The Bear said:

Tipping points aren't just a crappy TV game show. Feels like we're getting to see one or two of them in the data. 

About a decade or two sooner than anticipated, too.  Fun times.

 

7 minutes ago, Dahnsouff said:

Don’t think scientists alone turn this one around, it requires global consensus and no chance of that

Well, it certainly becomes self-fulfilling prophecy with that mindset, doesn't it?

[Dahnsouff]

5 minutes ago, leicsmac said:

Well, it certainly becomes self-fulfilling prophecy with that mindset, doesn't it?

I am not a religious man, so believe faith will not save this problem either, but of course it requires action yet this requires a colossal show of will in a time of apathy

[grobyfox1990]

16 minutes ago, Dahnsouff said:

Don’t think scientists alone turn this one around, it requires global consensus and no chance of that

Absolutely not. Scientists are barely even the tipping point of scratching the surface of solving the problem. It requires every industry working in a coordinated manner. So yeh, no chance of that 

[Soup]

@leicsmac I've been listening/reading a lot of Bjørn Lomborg recently. What's your take on him? Genuinely interested in your opinion. He seems to be on board with climate change but suggests we're going about it the wrong way.

[The Bear]

The world won't react properly until its too late. And only then because it'll be costing the money men their money. We're seeing a sneak peek with the current energy crisis. Firms will protect their profits at the expense of the people, and the government will let them because they'll want to keep Big Money on their side. 

Edited 15 September 2022 by The Bear