Author Topic: SpaceX F9 : CRS SpX-17 : May 4, 2019 - DISCUSSION (Read 76909 times)

Joffan · « **Reply #40 on:** 04/18/2019 08:26 pm »

Quote from: Nomadd on 04/18/2019 07:59 pm

Quote from: PM3 on 04/18/2019 06:57 pm
Launch is slipping according to Dan Cooper. He changed it from NET April 26 to "April 26 the very earliest", then to NET late April at about 4am Eastern, which corresponds to ~ April 30. (Launch gets earlier 22-26 min. per day.)

http://www.launchphotography.com/Delta_4_Atlas_5_Falcon_9_Launch_Viewing.html
How is "NET April 26" to "April 26 at the very earliest" a change?

Arguably the current phrasing of "end of April" is not a change either; just a less precise way of saying the same thing.

I wouldn't read very much into the "about 4am" timing either; that's just early enough to cater for a slip of a few days, erring on the "be there early" side. If you're keen enough to get up at that time you're probably (a) OK with waiting an hour and (b) likely to know where to check for exact times on the day.

Lar · « **Reply #41 on:** 04/18/2019 08:27 pm »

Quote from: Nomadd on 04/18/2019 07:59 pm

How is "NET April 26" to "April 26 at the very earliest" a change?

Change in emphasis? Otherwise nil, IMHO.

Alexphysics · « **Reply #42 on:** 04/18/2019 10:33 pm »

I've followed that page for years, when he changes the wording, it is important to take note of that. If it says "end of April" it doesn't mean the date is the same as the previous one. Just saying for those that may be confused about it. There are some other people talking about a slip too.

Draggendrop · « **Reply #43 on:** 04/18/2019 11:16 pm »

Easter weekend is almost on us, a static fire due and we are 8 days from the NET of 26th of April.

Beginning to look like a recipe for a minor delay....I'm only guessing and won't be surprised either way.

I just want to watch a SF and launch.

rockets4life97 · « **Reply #44 on:** 04/19/2019 02:36 am »

Any reports on which capsule is being re-used on this mission?

Edit: Looks like the CRS-12 capsule is next in line. The only other post-CRS-4 capsule that hasn't been re-used twice is the CRS-5 capsule according to this capsule list a r/spacex.

Draggendrop · « **Reply #45 on:** 04/19/2019 04:14 am »

https://twitter.com/EmreKelly/status/1118930654727634944

ZachS09 · « **Reply #46 on:** 04/19/2019 11:09 am »

Why were there rumors about SpX-17 slipping four more days before the NOTAMs came in?

Rondaz · « **Reply #47 on:** 04/19/2019 02:39 pm »

SpaceX CRS-17 Launch Now Scheduled for April 30

Sarah Loff Posted on April 19, 2019

A SpaceX Dragon cargo spacecraft is now scheduled to launch at 4:22 a.m. EDT on Tuesday, April 30, on a Falcon 9 rocket from Space Launch Complex 40 at Cape Canaveral Air Force Station in Florida. This will be SpaceX’s 17th Commercial Resupply Services contract mission to the International Space Station for NASA.

SpaceX will take advantage of the additional time to perform a static fire test and pre-flight checkouts. Falcon 9 and Dragon are on track to be flight ready for an earlier launch attempt, however, April 30 is the most viable date for both NASA and SpaceX due to station and orbital mechanics constraints.

NASA will host a media teleconference at 11 a.m. Monday, April 22, to discuss select science investigations the Dragon will deliver to the astronauts living and working aboard the orbiting laboratory. NASA will stream audio from the discussion at http://www.nasa.gov/live.

https://blogs.nasa.gov/spacex/2019/04/19/spacex-crs-17-launch-now-scheduled-for-april-30/

gongora · « **Reply #48 on:** 04/19/2019 02:51 pm »

Quote from: ZachS09 on 04/19/2019 11:09 am

Why were there rumors about SpX-17 slipping four more days before the NOTAMs came in?

The Launch Hazard area was issued earlier, they just weren't posted in this thread yet. (Also, we're seen obsolete NOTAM/NOTMAR issued before when we knew a slip was likely.)

jimothytones · « **Reply #49 on:** 04/19/2019 04:50 pm »

So am I correct in assuming this slip means no more noctilucent exhaust?

Comga · « **Reply #50 on:** 04/19/2019 06:59 pm »

Quote from: jimothytones on 04/19/2019 04:50 pm

So am I correct in assuming this slip means no more noctilucent exhaust?

4:22 AM EDT, is ~ 3:22 hours after local solar midnight
3.3 hrs means ~ 50 degrees of rotation past midnight
That puts the sunlight well over 1000 km above the ground.
The plume probably won't be sunlit until after the initial second stage burn.

Prettz · « **Reply #51 on:** 04/20/2019 01:22 pm »

Quote from: Rondaz on 04/19/2019 02:39 pm

SpaceX will take advantage of the additional time to perform a static fire test and pre-flight checkouts. Falcon 9 and Dragon are on track to be flight ready for an earlier launch attempt, however, April 30 is the most viable date for both NASA and SpaceX due to station and orbital mechanics constraints.

So what's the cause of the delay? I still can't tell.

ZachS09 · « **Reply #52 on:** 04/20/2019 01:26 pm »

My best guess is that they're running behind schedule.

That's been my go-to theory when it comes to a Falcon 9 mission slipping without any warning.

HeartofGold2030 · « **Reply #53 on:** 04/20/2019 01:41 pm »

Quote from: ZachS09 on 04/20/2019 01:26 pm

My best guess is that they're running behind schedule.

That's been my go-to theory when it comes to a Falcon 9 mission slipping without any warning.

NASA did provide an explanation: it slipped due to "station and orbital mechanics constraints."

yokem55 · « **Reply #54 on:** 04/21/2019 12:28 am »

Pretty decent odds that the Dragon 2 anomaly today will push this flight back a while for a couple of reasons:
1) They'll want to clear any commonality with cargo dragon.
2) The landing zone for the booster is going to be off limits for a while.

quagmire · « **Reply #55 on:** 04/21/2019 12:31 am »

Quote from: yokem55 on 04/21/2019 12:28 am

Pretty decent odds that the Dragon 2 anomaly today will push this flight back a while for a couple of reasons:
1) They'll want to clear any commonality with cargo dragon.
2) The landing zone for the booster is going to be off limits for a while.

1. If issue was caused by Superdraco's, no commonality.

2. Could always switch to drone ship or booster will be expended. Doubt NASA will ok delaying a launch just so SpaceX could retrieve the booster.

cppetrie · « **Reply #56 on:** 04/21/2019 12:34 am »

Quote from: yokem55 on 04/21/2019 12:28 am

Pretty decent odds that the Dragon 2 anomaly today will push this flight back a while for a couple of reasons:
1) They'll want to clear any commonality with cargo dragon.
2) The landing zone for the booster is going to be off limits for a while.

They could deal with the landing zone issue by landing on the drone ship just off shore. Not sure how much commonality there is between the two dragons. Cargo dragon doesn’t have superdracos I don’t think. Will depend on how quickly they identify the issue that caused the problem. If it’s specific to the superdraco and not fuel tank rupture it may not have any effect.

Edit: ninja’d

Alexphysics · « **Reply #57 on:** 04/21/2019 01:03 am »

Quote from: yokem55 on 04/21/2019 12:28 am

Pretty decent odds that the Dragon 2 anomaly today will push this flight back a while for a couple of reasons:
1) They'll want to clear any commonality with cargo dragon.
2) The landing zone for the booster is going to be off limits for a while.

Worth noting the test stand for Crew Dragon is not literally on LZ-1 but on an adjacent facility exclusively built for that.

Orbiter · « **Reply #58 on:** 04/21/2019 01:07 am »

Quote from: yokem55 on 04/21/2019 12:28 am

Pretty decent odds that the Dragon 2 anomaly today will push this flight back a while for a couple of reasons:
1) They'll want to clear any commonality with cargo dragon.
2) The landing zone for the booster is going to be off limits for a while.

They have LZ-2.

quagmire · « **Reply #59 on:** 04/21/2019 01:08 am »

Quote from: Alexphysics on 04/21/2019 01:03 am

Quote from: yokem55 on 04/21/2019 12:28 am
Pretty decent odds that the Dragon 2 anomaly today will push this flight back a while for a couple of reasons:
1) They'll want to clear any commonality with cargo dragon.
2) The landing zone for the booster is going to be off limits for a while.

Worth noting the test stand for Crew Dragon is not literally on LZ-1 but on an adjacent facility exclusively built for that.

I am thinking more along hazardous material clean up than damage to LZ-1 itself that could switch it to drone ship recovery. Maybe LZ-2 is far enough away for safe recovery ops though.....