Author Topic: SpaceX FH : Falcon Heavy Demo : Feb 6, 2018 : Discussion Thread 2  (Read 417870 times)

Online Semmel

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Caught this during Gwynne Shotwell's TED presentation, FH being lifted up before being placed on the TEL.

The most powerful active rocket in the world AND a recovered first stage in one photo?
How can that not be a favorite?
Thanks for snagging it!

Well.. three recovered first stages really.. ;)

Offline oiorionsbelt

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Caught this during Gwynne Shotwell's TED presentation, FH being lifted up before being placed on the TEL.

The most powerful active rocket in the world AND a recovered first stage in one photo?
How can that not be a favorite?
Thanks for snagging it!

Well.. three recovered first stages really.. ;)
The current most powerful rocket is made from reused parts.


Offline lamid

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aphelion Tesla Roadster with Starman 9 nov 2018 12:33 UTC
248 892 569 km

source
Horizons, Tesla Roadster (spacecraft) 143205 (solution #10)
« Last Edit: 11/08/2018 04:00 pm by lamid »

Offline speedevil

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aphelion Tesla Roadster with Starman 9 nov 2018 12:33 UTC
248 892 569 km

source
Horizons, Tesla Roadster (spacecraft) 143205 (solution #10)
For the same source, this gives the velocity on 2018-Feb-11 19:00  at 0.01006AU from earth (around edge of hill sphere) as  3.50463km/s.
Shortly earlier, a few minutes before 2018-Feb-08 04:00  it crossed the distance of the moon, at  0.002580AU traveling    3.736km/s.


« Last Edit: 11/05/2018 10:26 am by speedevil »

Offline lamid

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Just a little.
In the picture of Tesla Roadster Spaceman it looks like the aphelion is a lot behind the orbit of Mars.
Only the Mars orbit has an eccentricity of 0.0934, that is, 1.382x1.666 au.
If Tesla Roadster Spaceman flew to the opposite side, it would fly tight,
99.86% to Mars aphelion
would miss 337000 km, 0.135%.

   Mars   SpaceX Roadster   
ecentricity   0.0934   0.256   
Inclination   1.850   1.077   °
Omega   49.558   317.1   °
Aphelion   1.666   1.663745   au
Aphelion   249,230,052   248,892,746 km
Perihelion   1.382   0.986   au

« Last Edit: 11/12/2018 09:12 am by lamid »

Offline oiorionsbelt

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While rewatching the FH demo launch video I noticed something for the first time.
 @ 3:46 in the video the commentator describes the FH 2nd stage this way.
 
Quote
the 2nd stage is exactly the same as any other F9 flight, except we've added a bit more helium onto it this time.

Why do they need more He in the 2nd stage of FH as compared to F9?
 
Sorry if this has been answered but I have not see it referenced.


« Last Edit: 11/12/2018 08:35 pm by oiorionsbelt »

Online Lars-J

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It could have something to do with long coast of that stage before the TMI burn.

Online meekGee

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Or needing higher pressure.  Remember the pressure carries a bug chunk of the compressive load.

-----
ABCD: Always Be Counting Down

ABCD - Always Be Counting Down

Offline LouScheffer

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It could have something to do with long coast of that stage before the TMI burn.
You would expect a long coast to need almost twice as much helium.  They heat the helium with the engines, so it takes less mass to fill the volume at the pressure they need.  So during boost, the tank is filled with hot helium.  During a long coast, the helium already in the tank will cool.  Say they inject it at 400 K (just a guess).  In the LOX tank, it will drop to about 100K, and hence provide only 1/4 the pressure after the long coast.  Since the tank is almost empty, it will take roughly 3/4 the original amount of hot helium to pressurize it again.  The fuel tank will not cool as much, so maybe need 1/2 the original helium more.

Offline kessdawg

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National Geographic documentary about Falcon Heavy demo flight.  Includes interesting behind the scenes discussions.  Even snippets of a discussion about frequency ranges to avoid damage to the vehicle during static fire.

https://www.nationalgeographic.com/tv/watch/12e413e68c538ba79a298f709efc1607/

Offline atsf90east

National Geographic documentary about Falcon Heavy demo flight.  Includes interesting behind the scenes discussions.  Even snippets of a discussion about frequency ranges to avoid damage to the vehicle during static fire.

https://www.nationalgeographic.com/tv/watch/12e413e68c538ba79a298f709efc1607/

Watching this launch again with all of the behind the scenes looks made it just as exciting and emotional as watching it live earlier this year. 
Attended Launches: Space Shuttle: STS-85, STS-95, STS-96, STS-103. Falcon 9: Thaicom-8

Offline jak Kennedy

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National Geographic documentary about Falcon Heavy demo flight.  Includes interesting behind the scenes discussions.  Even snippets of a discussion about frequency ranges to avoid damage to the vehicle during static fire.

https://www.nationalgeographic.com/tv/watch/12e413e68c538ba79a298f709efc1607/

Damn, “Geograpic restriction” when I try to play it, WTFalcon. Not so “National”!

Offline russianhalo117

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National Geographic documentary about Falcon Heavy demo flight.  Includes interesting behind the scenes discussions.  Even snippets of a discussion about frequency ranges to avoid damage to the vehicle during static fire.

https://www.nationalgeographic.com/tv/watch/12e413e68c538ba79a298f709efc1607/

Damn, “Geograpic restriction” when I try to play it, WTFalcon. Not so “National”!
use a VPN in the US and will not be an issue.

Online matthewkantar

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Was that new Falcon 1 blooper reel material I saw?

Offline ZachS09

National Geographic documentary about Falcon Heavy demo flight.  Includes interesting behind the scenes discussions.  Even snippets of a discussion about frequency ranges to avoid damage to the vehicle during static fire.

https://www.nationalgeographic.com/tv/watch/12e413e68c538ba79a298f709efc1607/

Watching this launch again with all of the behind the scenes looks made it just as exciting and emotional as watching it live earlier this year. 

I saw it as well, and while I was pleased to relive the side core landings at Cape Canaveral, I'm surprised that they didn't cover the center core landing failure near the drone ship.
Because the Falcon Heavy Test Flight was successful, it has inspired thousands of people to consider changing the future of space travel.

Offline CorvusCorax

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I posted this link in the discussion thread a month ago.  It is the same video, although region locked for USA I believe.

https://www.nationalgeographic.com/tv/watch/12e413e68c538ba79a298f709efc1607/




I believe this is a version of the same video which isn't region locked. Looks like a re-upload of a version that was broadcasted on TV somewhere in the world. Guess there's no way to tell if and how long it'll stay up unless you're a international copyright law expert ;)

Offline catdlr

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I posted this link in the discussion thread a month ago.  It is the same video, although region locked for USA I believe.

https://www.nationalgeographic.com/tv/watch/12e413e68c538ba79a298f709efc1607/




I believe this is a version of the same video which isn't region locked. Looks like a re-upload of a version that was broadcasted on TV somewhere in the world. Guess there's no way to tell if and how long it'll stay up unless you're a international copyright law expert ;)


Not available anymore.....
« Last Edit: 12/05/2018 04:52 am by catdlr »
Tony De La Rosa

Offline theinternetftw

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I posted this in a different thread, but since the same discussion is going on here:

This is a US amazon link to buy the show for $3: https://www.amazon.com/Mars-Inside-SpaceX/dp/B07KFZPD1N

It might be on your region's amazon, too, if you search for the title there.

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