Author Topic: SpaceX Falcon 9 / Dragon 2 : SpX-DM1 : March 2, 2019 : DISCUSSION (Read 642512 times)

PahTo · « **Reply #760 on:** 03/02/2019 12:58 am »

I'm fully on board with the importance of this mission, and my interest is very high--but then again I've been a member of NSF for more than a decade, so I s;pose I'm biased.
I'm still wondering about the config of the spacecraft...
Go DM1--deliver the goods!
(sorry to go all party thread, but this is a big deal)

AUricle · « **Reply #761 on:** 03/02/2019 01:24 am »

Quote from: Lar on 03/01/2019 06:25 pm

Quote from: Phillip Clark on 03/01/2019 05:59 pm
Something about this flight is not generating much interest. This will be the first attempt by an unmanned US spacecraft to be launched and then complete a full automatic docking with an already-orbiting spacecraft (ISS in this case).
(fan) Why do you think that this flight isn't generating much interest? I might be missing out on who is and isn't interested but I see high interest. Could be wrong.

I'll guarantee you anyone who has followed the evolution of Falcon9/Dragon is as excited as I am about this mission. Yeah, it's (supposed to) happening very late for an old buzzard like me, (CST 1:49) but speaking for myself, I'm like a cat on a hot tin roof already...GO FALCON! GO DRAGON! GO SPACEX / NASA!! Oh almost forgot, GO RIPLEY!!

vaporcobra · « **Reply #762 on:** 03/02/2019 03:39 am »

Quote from: rdale on 03/01/2019 01:38 pm

Here's another version of the audio without the extra commentary and radio music

http://issaudio.byethost7.com/iss/2019-03-01-Fri-0815_trim.mp3

Will try to summarize some of what was said. Fair warning that it is entirely ambiguous when the woman is speaking and when she is translating, so I have no idea what is coming from her and what is a translation.

Apparently, the main concern is once Crew Dragon is from 40-30m, "when we switch from 0.3 m/s to 0.8 m/s." "0.3 m/s is not very good for us; 0.8 m/s: we dock our vehicles at that so we are very familiar with that." If this was coming from Oleg, it sounded like it was something he was personally concerned about, whether or not the Russian ground segment agrees.

In other words, the hang-up is apparently a different and thus unfamiliar approach velocity outside 30m, with that velocity actually being ~2.7x slower than what is familiar. Oleg was audibly worried about the fact that "this 10-ton...huge thing is going to be running at us". Overall, very confusing, as a 2.7x slower approach would seem to give the crew... 2.7x more time to deal with any problems and/or abort the approach inside 30m.

Edit: Just gonna strike the last paragraph off the record for now, this all makes very little logical sense.

Johnnyhinbos · « **Reply #763 on:** 03/02/2019 05:53 am »

Quote from: vaporcobra on 03/02/2019 03:39 am

Quote from: rdale on 03/01/2019 01:38 pm
Here's another version of the audio without the extra commentary and radio music

http://issaudio.byethost7.com/iss/2019-03-01-Fri-0815_trim.mp3

Will try to summarize some of what was said. Fair warning that it is entirely ambiguous when the woman is speaking and when she is translating, so I have no idea what is coming from her and what is a translation.

Apparently, the main concern is once Crew Dragon is from 40-30m, "when we switch from 0.3 m/s to 0.8 m/s." "0.3 m/s is not very good for us; 0.8 m/s: we dock our vehicles at that so we are very familiar with that." If this was coming from Oleg, it sounded like it was something he was personally concerned about, whether or not the Russian ground segment agrees.

In other words, the hang-up is apparently a different and thus unfamiliar approach velocity outside 30m, with that velocity actually being ~2.7x slower than what is familiar. Oleg was audibly worried about the fact that "this 10-ton...huge thing is going to be running at us". Overall, very confusing, as a 2.7x slower approach would seem to give the crew... 2.7x more time to deal with any problems and/or abort the approach inside 30m.

Edit: Just gonna strike the last paragraph off the record for now, this all makes very little logical sense.

[Note: Moved my post here when I realized I had responded to an Update thread post]

I don’t think you _ever_ hear the woman’s own words - meaning, like a translator for the deaf, she never says her own words. Pretty sure of that.

That being said, my take was she dropped a decimal place when she says “0.8”. So it was 0.3 m/s outside the box and 0.08 m/s inside the box. That would explain Oleg being concerned regarding ramming speed of 0.3 instead of the more leisurely 0.08.

Of course, probably wouldn’t take much effort to find what the Russian approach speed is by looking at the OSD found on docking videos...

Orbiter · « **Reply #764 on:** 03/02/2019 05:56 am »

Looks like the SpaceX webcast and the NASA webcast will be one and the same tonight.

trekkie604 · « **Reply #765 on:** 03/02/2019 06:02 am »

NTV is ~20 sec delayed?

DwightM · « **Reply #766 on:** 03/02/2019 06:05 am »

Quote from: trekkie604 on 03/02/2019 06:02 am

NTV is ~20 sec delayed?

Looks like it, the Florida Today link Steven provided seems to be more on target.

chewi · « **Reply #767 on:** 03/02/2019 06:10 am »

Max stream quality is 720p?

Comga · « **Reply #768 on:** 03/02/2019 06:15 am »

Bridenstine's version of the history of Musk and SpaceX is..... polished.
Musk invented the Falcon 1 because he couldn't afford a $20M Russian ICBM?
Musk's version was a much harsher with regards to the Russians.

EspenU · « **Reply #769 on:** 03/02/2019 06:22 am »

Don't like that the countdown clock disappears during the promo videos. Hope it doesn't disappear close to launch as it usually does on NASA streams.

Jarnis · « **Reply #770 on:** 03/02/2019 06:24 am »

Youtube having garbage bitrate for the stream. Ustream NASA TV mirror better quality, but 30s delayed.

Lar · « **Reply #771 on:** 03/02/2019 06:26 am »

Quote from: Comga on 03/02/2019 06:15 am

Bridenstine's version of the history of Musk and SpaceX is..... polished.
Musk invented the Falcon 1 because he couldn't afford a $20M Russian ICBM?
Musk's version was a much harsher with regards to the Russians.

polished... hmm ... I thought it was almost deliberately misleading. Disappointed.

tyrred · « **Reply #772 on:** 03/02/2019 06:29 am »

Quote from: Jarnis on 03/02/2019 06:24 am

Youtube having garbage bitrate for the stream. Ustream NASA TV mirror better quality, but 30s delayed.

I concur. Benjamin has been grousing about the youtube quality recently, likely he'll be grousing about it even more next Saturday on TMRO. Really too bad, youtube should have this type of thing on lockdown.

Zed_Noir · « **Reply #773 on:** 03/02/2019 06:30 am »

Quote from: Lar on 03/02/2019 06:26 am

Quote from: Comga on 03/02/2019 06:15 am
Bridenstine's version of the history of Musk and SpaceX is..... polished.
Musk invented the Falcon 1 because he couldn't afford a $20M Russian ICBM?
Musk's version was a much harsher with regards to the Russians.
polished... hmm ... I thought it was almost deliberately misleading. Disappointed.

But not unexpected. Bridenstine got to work with the Russians after all. No need to insult them while they have "problems".

Comga · « **Reply #774 on:** 03/02/2019 06:31 am »

They just showed a view of the launch control room.
Having seen it last night in the "Apollo 11" IMax documentary, it is quite the contrast with all the flat screen displays.
No more attached rotary phones or 8" monochrome monitors, or tractor feed plotters.
And people dressing a little more colorfully than white button shirts with black ties.

Ben the Space Brit · « **Reply #775 on:** 03/02/2019 06:31 am »

So, what's that in the cabin with Starman-2? A plushie of some sort? Didn't Elon want him getting 'lonely up in space' or something?

DwightM · « **Reply #776 on:** 03/02/2019 06:32 am »

Quote from: Ben the Space Brit on 03/02/2019 06:31 am

So, what's that in the cabin with Starman-2? A plushie of some sort? Didn't Elon want him getting 'lonely up in space' or something?

Think of it the same as the plush toys the Russians bring along on the Soyuz flights, a zero G indicator.

mlindner · « **Reply #777 on:** 03/02/2019 06:34 am »

So:

SpaceX stream: Terrible bitrate that is hard to watch
NASA TV Youtube stream: Bad (but better) bitrate and but delayed by 30 seconds.
Ustream NASA TV stream: Mono audio with low bitrate instead of stereo but best video bitrate and an additional 10 seconds delayed (total 40 second delay)

Why can't NASA and SpaceX do a sane stream?

Comga · « **Reply #778 on:** 03/02/2019 06:38 am »

Quote from: tyrred on 03/02/2019 06:29 am

Quote from: Jarnis on 03/02/2019 06:24 am
Youtube having garbage bitrate for the stream. Ustream NASA TV mirror better quality, but 30s delayed.

I concur. Benjamin has been grousing about the youtube quality recently, likely he'll be grousing about it even more next Saturday on TMRO. Really too bad, youtube should have this type of thing on lockdown.

My views are clear on SpaceX, Livestream, and SFN (Although the latter two are now paused.)
How are you determining the lag?
SpaceX.com is ahead of the others, and adding the countdown time to the time on the computer clock puts liftoff close to 2:49:.... (They just took off the countdown clock. Again)
edit: summing to 2:49:04

mlindner · « **Reply #779 on:** 03/02/2019 06:40 am »

Quote from: Comga on 03/02/2019 06:38 am

Quote from: tyrred on 03/02/2019 06:29 am
Quote from: Jarnis on 03/02/2019 06:24 am
Youtube having garbage bitrate for the stream. Ustream NASA TV mirror better quality, but 30s delayed.

I concur. Benjamin has been grousing about the youtube quality recently, likely he'll be grousing about it even more next Saturday on TMRO. Really too bad, youtube should have this type of thing on lockdown.

My views are clear on SpaceX, Livestream, and SFN (Although the latter two are now paused.)
How are you determining the lag?
SpaceX.com is ahead of the others, and adding the countdown time to the time on the computer clock puts liftoff close to 2:49:.... (They just took off the countdown clock. Again)
edit: summing to 2:49:04

There's no reason that SpaceX's Youtube stream should be worse than the NASA TV youtube stream though... It has even lower bitrate than NASA does.