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Poll - First Launch of Falcon9

Posted by: beancounter - Tue Feb 23, 2010 12:59 am
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Poll - First Launch of Falcon9 

First Launch of Falcon9 is going to be a
Success 90%  90%  [ 27 ]
Failure 10%  10%  [ 3 ]
Total votes : 30

Poll - First Launch of Falcon9 
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Post Re: Poll - First Launch of Falcon9   Posted on: Sun Jun 06, 2010 2:23 pm
Watching a replay of the launch I just remembered, that there was even another "panic" moment before all that sparkling ice in the plume, that I forgot to mention above: liftoff itself.

I have two questions about liftoff:
1) why did Falcon 9 lift of before T-0?
2) why the roughly 90° roll right at liftoff? Was that because of the interference problems with the FTS?

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Post Re: Poll - First Launch of Falcon9   Posted on: Sun Jun 06, 2010 7:52 pm
I can only answer to the first one. I believe that the webcast was out of hawthorn. The sound and countdown graphic were added on top of the live feed. They were added after a separate processing loop causing a disparity. If you watch footage from people on site the lift off is right on time. The engines light 3 second before lift off for the hold down, but lift off happens precisely at T0.

I hope that they get all their coverage issues sorted out for the second flight. Especially being able to handle the huge amount of traffic. They will probably have to set up mirrors all over the continent.


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Post Re: Poll - First Launch of Falcon9   Posted on: Sun Jun 06, 2010 8:17 pm
Ah, thanks for the explanation, didn't think about delays between Florida and California + additional processing. (I do know about the hold down of course ;)).

Regarding the webcast issues, I hope that Ben from Spacevidcast manages to get in touch with them for some live webcast cooperation. That would be truly awesome! :)

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Post Re: Poll - First Launch of Falcon9   Posted on: Sun Jun 06, 2010 8:18 pm
Given that second launch will be NASA funded, I'd expect NASATV will cover it.


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Post Re: Poll - First Launch of Falcon9   Posted on: Fri Jun 11, 2010 2:58 am
Went back and had another look at the video and only then noticed the roll at liftoff. Looked quite deliberate and controlled but why? Haven't heard an answer as yet but thought someone mentioned orientation as per initial guidance setup.
Also heard the MECO 2 call but missed MECO 1. Anyone know when the intial 2 main engine shutdown occurred?

Cheers.

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Post Re: Poll - First Launch of Falcon9   Posted on: Fri Jun 11, 2010 9:32 pm
Maybe the roll at liftoff is the rocket unscrewing itself from the hold-down system? :lol:

I guess as an orientation maneouvre to match up with the guidance frame of reference, it looks paticularly peculiar because it is performed so low down, rather than waiting for the rocket to clear the tower (such as it is) before doing it.

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Post Re: Poll - First Launch of Falcon9   Posted on: Sat Jun 12, 2010 8:12 am
So why not orient it correctly on the ground so you don't need to do the manoeuvre?


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Post Re: Poll - First Launch of Falcon9   Posted on: Sat Jun 12, 2010 5:46 pm
JamesHughes wrote:
So why not orient it correctly on the ground so you don't need to do the manoeuvre?


Stonking good question. Surely someone at SpaceX can tell us about that roll maneouvre? When you get a minute?

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Post Re: Poll - First Launch of Falcon9   Posted on: Sat Jun 12, 2010 7:58 pm
xiphius wrote:
Maybe the roll at liftoff is the rocket unscrewing itself from the hold-down system? :lol:

ahahaha, that was a good one, I almost spilled my drink :D

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Post Re: Poll - First Launch of Falcon9   Posted on: Sun Jun 13, 2010 10:34 am
xiphius wrote:
Maybe the roll at liftoff is the rocket unscrewing itself from the hold-down system? :lol:


:)


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Post Re: Poll - First Launch of Falcon9   Posted on: Sun Jun 13, 2010 6:35 pm
JamesHughes wrote:
So why not orient it correctly on the ground so you don't need to do the manoeuvre?


Maybe the orientation needs to be different for different missions, probably determined by the orbital inclination. The rocket can't be placed on the pad in arbitrary orientations due to the locations of umbilical connections and strongpoints having to match up with things on the pad. So you need to do a mission-specific roll for each launch.

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Post Re: Poll - First Launch of Falcon9   Posted on: Mon Jun 14, 2010 4:12 am
No the roll at lift off caught the SpaceX crew by surprise. Turns out it was caused by the rotation of the engine exhaust due to the spiral cooling on the engine exhaust nozzle as well as the turbine roll-control exhaust. Apparently they're going to de-tune this for future flights.

Looked pretty impressive even if unintended when it happened though. This rocket doing a quick roll before she even cleared the tower :D

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Post Re: Poll - First Launch of Falcon9   Posted on: Tue Jun 15, 2010 9:51 pm
Phew... Well it's good it decided to roll along this axis... :D


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Post Re: Poll - First Launch of Falcon9   Posted on: Tue Jun 15, 2010 10:31 pm
Mchl wrote:
Phew... Well it's good it decided to roll along this axis... :D


But not as impressive as it would've been if it did it on one of the others, and still managed to complete the objectives!


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Post Re: Poll - First Launch of Falcon9   Posted on: Wed Jun 16, 2010 9:36 am
Haha! That's true! :lol:


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