Author Topic: LIVE: TianGong-1 JSLC CZ-2F (T1) launch September 29, 2011, and future events  (Read 504342 times)

Offline John Duncan

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Re: LIVE: TianGong-1 JSLC CZ-2F (T1) launch September 29, 2011
« Reply #580 on: 09/29/2011 01:41 PM »
Good for China!  Congrats!

All rocket launches are cool to watch, even Chinese ones!

:)
-John
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Offline Galactic Penguin SST

Why do they separate the boosters from the first stage if 1-2 sep is at the same time? To make sure there is no thrust imbalance? But then S1 does have 4 engines, too, 4 engines should rather help to level these.

This new version of the LM-2F rocket uses lengthened liquid boosters with a higher propellant load (the boosters for the original LM-2F separates at ~T+140s), and probably the engineers decided not to fix the boosters to the first stage, since it would require in-depth investigation on the effect of series staging (if it ain't broke, don't fix it).
Chinese spaceflight is a cosmic riddle wrapped in a galactic mystery inside an orbital enigma... - (not) Winston Churchill

Online pippin

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Re: LIVE: TianGong-1 JSLC CZ-2F (T1) launch September 29, 2011
« Reply #582 on: 09/29/2011 01:42 PM »
Why do they separate the boosters from the first stage if 1-2 sep is at the same time? To make sure there is no thrust imbalance? But then S1 does have 4 engines, too, 4 engines should rather help to level these.

Separation of the boosters takes place at T+155s and first stage separation takes place at T+159s

OK, but why? I mean: it's an additional separation event and I don't think these 4 seconds will make a significant difference in payload/delta-v so there has to be some reason why they add a complex separation mechanism.

Offline Satori

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Re: LIVE: TianGong-1 JSLC CZ-2F (T1) launch September 29, 2011
« Reply #583 on: 09/29/2011 01:43 PM »


I suppose this is the time of TG-1 separation?


Offline saturnapollo

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Re: LIVE: TianGong-1 JSLC CZ-2F (T1) launch September 29, 2011
« Reply #585 on: 09/29/2011 01:43 PM »
Quote
So far nothing on CNN or its website about the launch.
Strange?

Both CNN and the BBC showed the launch live!

Keith

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Re: LIVE: TianGong-1 JSLC CZ-2F (T1) launch September 29, 2011
« Reply #586 on: 09/29/2011 01:43 PM »
This new version of the LM-2F rocket uses lengthened liquid boosters with a higher propellant load (the boosters for the original LM-2F separates at ~T+140s), and probably the engineers decided not to fix the boosters to the first stage, since it would require in-depth investigation on the effect of series staging (if it ain't broke, don't fix it).
Ah. You mean they had versions with a shorter burn time before? THAT makes sense.

Offline Satori

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Re: LIVE: TianGong-1 JSLC CZ-2F (T1) launch September 29, 2011
« Reply #587 on: 09/29/2011 01:45 PM »
Why do they separate the boosters from the first stage if 1-2 sep is at the same time? To make sure there is no thrust imbalance? But then S1 does have 4 engines, too, 4 engines should rather help to level these.

Separation of the boosters takes place at T+155s and first stage separation takes place at T+159s

OK, but why? I mean: it's an additional separation event and I don't think these 4 seconds will make a significant difference in payload/delta-v so there has to be some reason why they add a complex separation mechanism.

Ah. I suppose that the generic characteristics of the boosters are the same on the two CZ-2F versions. We know that the boosters on CZ-2F/G have more propellant and thus a longer firing time. Maybe they haven't changed the timing of separation.

Offline input~2

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Re: LIVE: TianGong-1 JSLC CZ-2F (T1) launch September 29, 2011
« Reply #588 on: 09/29/2011 01:45 PM »

Offline Zero-G

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Re: LIVE: TianGong-1 JSLC CZ-2F (T1) launch September 29, 2011
« Reply #589 on: 09/29/2011 01:46 PM »
Did anybody get the orbit parameters? There was one of the controllers reading them out in Chinese and the commentator was translating them, but I did not get it all because of small breaks in the webcast. All I heard was "...gee of 350km and inclination of 42.75 degrees." So, what is actual apogee and perigee?
"I still don't understand who I am: the first human or the last dog in space." - Yuri Gagarin

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ESA quick with the congrats.

Offline Phillip Clark

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Re: LIVE: TianGong-1 JSLC CZ-2F (T1) launch September 29, 2011
« Reply #591 on: 09/29/2011 01:50 PM »
Did anybody get the orbit parameters? There was one of the controllers reading them out in Chinese and the commentator was translating them, but I did not get it all because of small breaks in the webcast. All I heard was "...gee of 350km and inclination of 42.75 degrees." So, what is actual apogee and perigee?

I missed the inclination, but they seemed to be talking about 250 km perigee and 350 km apogee.

This perigee altitude is around 50 km higher than we have seen on the Shenzhou missions.   I am waiting for the first element sets from USSSN, but it might be a few hours before that happens.
I've always been crazy but it's kept me from going insane - WJ.

Offline satcomuk

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Re: LIVE: TianGong-1 JSLC CZ-2F (T1) launch September 29, 2011
« Reply #592 on: 09/29/2011 01:51 PM »
Dont forget Sky Channel 510 CCTV News , live coverage continues

Online Liss

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Re: LIVE: TianGong-1 JSLC CZ-2F (T1) launch September 29, 2011
« Reply #593 on: 09/29/2011 01:53 PM »
At separation, height was 199 or 200 km, so I believe that's the perigee.
This message reflects my personal opinion based on open sources of information.

Online Ronsmytheiii

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Re: LIVE: TianGong-1 JSLC CZ-2F (T1) launch September 29, 2011
« Reply #594 on: 09/29/2011 01:55 PM »
"Every vision is a joke until the first man accomplishes it; once realized, it becomes commonplace." - Robert Goddard

Offline Phillip Clark

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Re: LIVE: TianGong-1 JSLC CZ-2F (T1) launch September 29, 2011
« Reply #595 on: 09/29/2011 01:55 PM »
Ooops, Gemini programme description with a Saturn-5 launch and somehow the Luna 16 sample return mission slipped in there as well!
I've always been crazy but it's kept me from going insane - WJ.

Offline Phillip Clark

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Re: LIVE: TianGong-1 JSLC CZ-2F (T1) launch September 29, 2011
« Reply #596 on: 09/29/2011 01:57 PM »
At separation, height was 199 or 200 km, so I believe that's the perigee.

Thank you!   I wondered whether the new launch vehicle modifications would mean a higher orbital injection altitude than previously.
I've always been crazy but it's kept me from going insane - WJ.

Offline input~2

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Re: LIVE: TianGong-1 JSLC CZ-2F (T1) launch September 29, 2011
« Reply #597 on: 09/29/2011 02:01 PM »
On this view, altitude was 199.157 km

Offline Satori

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Re: LIVE: TianGong-1 JSLC CZ-2F (T1) launch September 29, 2011
« Reply #598 on: 09/29/2011 02:05 PM »
Launch images

Offline lucspace

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Re: LIVE: TianGong-1 JSLC CZ-2F (T1) launch September 29, 2011
« Reply #599 on: 09/29/2011 02:08 PM »
Best viewing experience: on my iPhone, CCTV-1, crystal clear, although delayed some 30 seconds...

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