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A SpaceX Falcon 9 rocket has exploded at Cape Canaveral

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Re: A SpaceX Falcon 9 rocket has exploded at Cape Canaveral

#71
post #53

Earlier quoted context omitted.

Payload is sometimes mated, just depends. No word yet on this payload. https://twitter.com/NASASpaceflight/status/77134295079838924... UPDATE: payload lost. https://twitter.com/SciGuySpace/status/771352111657385984

That confirmation is so strange. Why would you confirm something with the screenshot of notepad "officially" when you have a twitter account?

To keep it out of search results. They can delete the image of the text whenever they'd like, and poof

Re: A SpaceX Falcon 9 rocket has exploded at Cape Canaveral

#72

Looks like they had a payload go with it. Sad. > "SpaceX confirm Amos-6 was aboard the Falcon 9 and was lost in the explosion." https://twitter.com/NASASpaceflight/status/77135388623807283...

I know nothing about space - why are they doing tests, where the rocket could possibly explode or fail, with the payload on board?

I think this kind of test is generally just looking at the performance of the engines. Certainly highly unusual for the rocket to explode as part of this kind of test.

Re: A SpaceX Falcon 9 rocket has exploded at Cape Canaveral

#73

Looks like they had a payload go with it. Sad. > "SpaceX confirm Amos-6 was aboard the Falcon 9 and was lost in the explosion." https://twitter.com/NASASpaceflight/status/77135388623807283...

I know nothing about space - why are they doing tests, where the rocket could possibly explode or fail, with the payload on board?

Maybe they offer discounts to payloads on test flights

Re: A SpaceX Falcon 9 rocket has exploded at Cape Canaveral

#74
This type of hardware failure makes me glad to do software where the most damage that can happen is an unhappy customer, not a huge explosion. Also why I was glad to give up a chemistry career after nearly poisoning everyone in the building when the hood system failed.

Re: A SpaceX Falcon 9 rocket has exploded at Cape Canaveral

#75
http://www.spaceflightinsider.com/organizations/space-explor...

This article has some information on the new characteristics:

- Although considered to be an iterative upgrade from the Falcon 9 v1.1 that preceded it, the modifications to the Full Thrust version have increased the vehicle’s published liftoff capabilities by as much as 30 percent.

- A key component of this performance increase is the use of “densified” propellant. By chilling the liquid oxygen to minus 340 degrees Fahrenheit (minus 207 degrees Celsius) and the RP-1, a highly-refined form of kerosene used as rocket fuel, to 20 degrees Fahrenheit ( minus 7 degrees Celsius), SpaceX has demonstrated the capability to store more oxidizer and fuel in a given volume, as well as increase the flow of propellant through the turbopumps on the first stage’s nine Merlin 1D powerplants and on the upper stage’s lone MVac.

Re: A SpaceX Falcon 9 rocket has exploded at Cape Canaveral

#76
post #61

Looks like they had a payload go with it. Sad. > "SpaceX confirm Amos-6 was aboard the Falcon 9 and was lost in the explosion." https://twitter.com/NASASpaceflight/status/77135388623807283...

There were no personal injuries, so I can't really be sad about a piece of electronics.

Agree. "Sad" is the PC thing to say when something like that happens. In most people's lives it's a big "who cares". [1]

The fact that you were downvoted (at least when I saw your comment) indicates people don't agree with what you are saying and is an example of trying to enforce a particular type of thinking on someone else as far as what they should think or feel.

[1] Of course I wouldn't say "who cares" directly to someone involved in the project in some way then you extend your condolences.

Re: A SpaceX Falcon 9 rocket has exploded at Cape Canaveral

#77

This type of hardware failure makes me glad to do software where the most damage that can happen is an unhappy customer, not a huge explosion. Also why I was glad to give up a chemistry career after nearly poisoning everyone in the building when the hood system failed.

Don't tell firmware/embedded programmers :-/

Re: A SpaceX Falcon 9 rocket has exploded at Cape Canaveral

#78
post #61

Looks like they had a payload go with it. Sad. > "SpaceX confirm Amos-6 was aboard the Falcon 9 and was lost in the explosion." https://twitter.com/NASASpaceflight/status/77135388623807283...

There were no personal injuries, so I can't really be sad about a piece of electronics.

On any project like that many engineers involved will have invested more than regular hours and pushed their work life balance - losing it all a couple of days from launch into space - that's harsh dude

Re: A SpaceX Falcon 9 rocket has exploded at Cape Canaveral

#79
post #9
post #5

Wild-ass speculation in the absence of more information than a tweet and a photo of a pad fire: SpaceX test-fire the first stage motors before each launch. If this was a test firing that went spectacularly wrong, it's embarrassing -- but there won't have been any human beings within blast range and it's better to fail in test than to fail in flight with a payload on top. (If it was a catastrophic failure during fueli…

Test fire for the launch of a commercial satellite (AMOS-6), which had been scheduled for a few days hence (and now presumably delayed, along with the rest of their launch schedule, pending further investigation). It might conceivably have been during fueling/de-fueling around the test. It's not yet clear from public reports whether the payload was attached at the time of the test-fire; sometimes they are, sometimes…

Interested to know more about the fuels... when I searched for info about Falcon-9 fueling a week or two ago (having briefly conceived of a semi-idle interest in rocket propellants) I read it was RP-1 plus oxidiser - so basically "just" high-spec kerosene. That doesn't jibe with supercooling in my mind... Please enlighten us further.

Re: A SpaceX Falcon 9 rocket has exploded at Cape Canaveral

#80

Looks like they had a payload go with it. Sad. > "SpaceX confirm Amos-6 was aboard the Falcon 9 and was lost in the explosion." https://twitter.com/NASASpaceflight/status/77135388623807283...

I know nothing about space - why are they doing tests, where the rocket could possibly explode or fail, with the payload on board?

Same reason anyone else does tests: Find potential and actual issues earlier than in production. The static fire they were doing is sort of a short integration / smoke (pun not intended) test whether the rocket as a whole (whether the payload is attached already depends on the customer; it reduces time between test and launch, though) works properly. Other tests are part of sort of a pre-flight checklist directly before launch and there have been launch scrubs due to issues at that point already. Every single engine is also fired for the full duration of the flight prior to installation in the rocket.

There's a lot of testing, both in isolation and in integration with other components. The risk of the rocket exploding should actually reduce with each test. Note also that in this case the malfunction was most likely with the pad equipment, not the rocket, so not doing static fires would in this case probably just have meant that you'd have an explosion at launch time one day.

EDIT: The static fire is more of a test for launch procedures, apparently:

“The goal of the static fire is to provide a dress rehearsal for the launch team, culminating in a three second firing of all nine of the first stage Merlin 1D engines to validate the health of the rocket.” (https://www.nasaspaceflight.com/2016/09/falcon-9-explodes-am...)

Makes sense in that the rocket itself is tested quite a bit beforehand already.

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