Author Topic: LIVE: SpaceX - Falcon I (Mk.II) NET March 20 (Attempt 2) (Read 265113 times)

Avron · « **Reply #200 on:** 03/20/2007 11:35 pm »

Did I hear T-16

0110 GMT

Jim · « **Reply #201 on:** 03/20/2007 11:36 pm »

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Nate_Trost - 20/3/2007 8:30 PM

Is rain an issue on the vehicle surface with LOX loaded?

Ice is not an issue for ELV's, only the shuttle.

Too many people have grown up on the shuttle and don't watch ELV's

braddock · « **Reply #202 on:** 03/20/2007 11:36 pm »

T-16 minute count pickup at 00:54 for a new liftoff time of 01:10. "please confirm that you can support".
I love this webcast audio...

Avron · « **Reply #203 on:** 03/20/2007 11:37 pm »

JiM

Why recycle 50% of the fuel?

Chris Bergin · « **Reply #204 on:** 03/20/2007 11:37 pm »

Remember guys, you can't copy and paste from any other site, as it's a breach of copyright.

Nick L. · « **Reply #205 on:** 03/20/2007 11:39 pm »

Loading fuel again.

ringshot · « **Reply #206 on:** 03/20/2007 11:45 pm »

Sorry if this was covered before (just got here a bit ago), but does anyone know if SpaceX is still using a "pull-away" LOX tank blanket?

It looks like a black covering on the LOX tank today, but is it mounted or a pull-away item?

Thanks!

G'Day...Ron

WHAP · « **Reply #207 on:** 03/20/2007 11:45 pm »

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Jim - 20/3/2007 6:36 PM

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Nate_Trost - 20/3/2007 8:30 PM

Is rain an issue on the vehicle surface with LOX loaded?

Ice is not an issue for ELV's, only the shuttle.

Too many people have grown up on the shuttle and don't watch ELV's

What about ice shedding onto SRB's on an ELV?

Nick L. · « **Reply #208 on:** 03/20/2007 11:46 pm »

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ringshot - 20/3/2007 8:45 PM

Sorry if this was covered before (just got here a bit ago), but does anyone know if SpaceX is still using a "pull-away" LOX tank blanket?

It looks like a black covering on the LOX tank today, but is it mounted or a pull-away item?

Thanks!

G'Day...Ron

Nope, it's now bonded insulation.

charlieb · « **Reply #209 on:** 03/20/2007 11:47 pm »

the wonders of a automated scripted countdown; recycle to a 'checkpoint' (like manually drain the fuel - set a few switches and relays to known positions), and hit GO. I'm purly guessing - but I bet ya..... This takes pure guts to try again - re-igniting an engine pressure fed or not is chancy....

William Graham · « **Reply #210 on:** 03/20/2007 11:48 pm »

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WHAP - 21/3/2007 12:45 AM
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Jim - 20/3/2007 6:36 PM
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Nate_Trost - 20/3/2007 8:30 PM Is rain an issue on the vehicle surface with LOX loaded?
Ice is not an issue for ELV's, only the shuttle. Too many people have grown up on the shuttle and don't watch ELV's
What about ice shedding onto SRB's on an ELV?

Not sure. The only Delta II ever to suffer an outright failure did so because of a crack in one of its SRBs, I don't know the cause, but it was in January, so it could have been ice.

Luckily, the Falcon doesn't have SRBs.

ilia25 · « **Reply #211 on:** 03/20/2007 11:48 pm »

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wirehead - 20/3/2007 7:29 PM

So are they going to adjust anything, or are they just going to try again and hope it's on the happy side of the .1psi red line kinda like I reboot my computer and try it again?

Could it be possible that they are fixing the fuel temp by reloading it?

josh_simonson · « **Reply #212 on:** 03/20/2007 11:49 pm »

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ilia25 - 20/3/2007 7:48 PM
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wirehead - 20/3/2007 7:29 PM So are they going to adjust anything, or are they just going to try again and hope it's on the happy side of the .1psi red line kinda like I reboot my computer and try it again?
Could it be possible that they are fixing the fuel temp by reloading it?

That's the plan.

DaveS · « **Reply #213 on:** 03/20/2007 11:50 pm »

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ilia25 - 21/3/2007 1:48 AM

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wirehead - 20/3/2007 7:29 PM

So are they going to adjust anything, or are they just going to try again and hope it's on the happy side of the .1psi red line kinda like I reboot my computer and try it again?

Could it be possible that they are fixing the fuel temp by reloading it?

Yes. What hey're doing is try to heat the RP-1 so that the tank pressure goes up a bit more.

braddock · « **Reply #214 on:** 03/20/2007 11:50 pm »

Q: what would you like fuel temp to be.
"We like it to be between 78 -80 deg F, it was 76." [they don't abort on fuel temperature, just chamber temp.]

ringshot · « **Reply #215 on:** 03/20/2007 11:51 pm »

Since Elon Musk is involved, I think it's a good bet that they're using the latest ground control software.

I agree that it is ballsy though, considering it's still classed as a first launch, you'd think they'd want a day to look the engine/structure over after that event.

Perhaps they classify it as the same as their 'static fire'; I wasn't here yet for it, how long was the burn?

G'Day...Ron

Danderman · « **Reply #216 on:** 03/20/2007 11:51 pm »

Does anyone have any insight as to how SpaceX plans to fix the low chamber pressure issue? I am certain that their plan is not to simply try again, this time with their fingers crossed.

NASA_Twix_JSC · « **Reply #217 on:** 03/20/2007 11:52 pm »

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Danderman - 20/3/2007 7:51 PM

Does anyone have any insight as to how SpaceX plans to fix the low chamber pressure issue? I am certain that their plan is not to simply try again, this time with their fingers crossed.

I get the impression they are simply going to try and again and hope it was a one off.

Chris Bergin · « **Reply #218 on:** 03/20/2007 11:52 pm »

Countdown re-starting in a few minutes.

wannamoonbase · « **Reply #219 on:** 03/20/2007 11:53 pm »

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braddock - 20/3/2007 8:50 PM

Q: what would you like fuel temp to be.
"We like it to be between 78 -80 deg F, it was 76." [they don't abort on fuel temperature, just chamber temp.]

Chamber temp or pressure?

One would think that some controls programming that adjusts the accetable chamber pressure to the fuel temp might help? Just a thought, I have guys reprogram control loops all the time, just not on rockets.