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@Hohmannfan you bear watching, young man... dear me :D
00:42
@Hohmannfan actually, that does make sense for air breathing SSTOs like Skylon :P
to certain extent
and some launch vehicles do use "banana peel" thermal shrouds too, like Minotaur I :)
Space Shuttle "owl balloons" to scare woodpeckers away looked like giant oranges,....
yeah these
I had never heard about the owl balloons before!
you'll gather lots of useless knowledge by the time you'll be my age too :)
I look forward to it...
 
2 hours later…
02:57
Jason-3 F9 1.1 hot fire was successful! Launch on Sunday! Go go ASDS landing!
Great line in Reddit - if a rocket lands on a barge and no one is around, does it make a sonic boom?
4
what's the target inclination for Jason-3?
OK got it on Wiki, 66.05°
so similar position for the barge as for CRS attempts
ah bah from Vandenberg LOL
does day/night matter for ASDS landing?
suppose not if there is no vision system for landing
03:12
@BrianLynch One other ASDS landing was at night. One was in daylight.
Do we think Marmac 303 will be named JRTI or a new name?
Latest drone flighst showing no name painted as last I heard.
where is OCISLY
Moved to Port Canaveral. Jaxport lease ended.
gotcha
New cruise ship spy cam.
hehehe you have some links?
I love those guys
yeah I kinda suspected that that's why I asked :P
I shall endevour to filter out the crap.
@geoffc oh yea true
No one to hear the sonic boom... Alas.
Does the drone ships camera drone, have a microphone?
has anyone been forecasting the odds that we'll see a heavy double landing attempt anytime soon?
03:20
First attempt.
So 100%
sweet, that's what it sounded like on sf101
I'm so giddy about their boldness
ERTW :)
Every attempt will try to recover both boosters on F-H, and where else they gonna land em? Center core will usually be ASDS landing.
ERTW?
oh wow I didn't realize centre core will be recovered
They are NOT kidding about recovery. They are super cereal about it.
2
(engineers rule the world)
03:22
@BrianLynch Good one!
I loved the cheering of the SpaceX employees on the LZ-1 landing. They were so into it, who needed the useless announcers, you could tell from the crowd.
so awesome
reminded me of the first Saturn I launch
Low mass F-H flights will try to RTLS the center core. But if performance is needed ASDS recovery. if you REALLY need the full payload capability and want to pay for it, they will expend the center core.
@BrianLynch That is the best video I saw all year. :) I skipped seeing Star Wars to see a Falcon land in real life. Went to see Star Wars two days later.
"if you REALLY need..."
03:25
Hey, when you need 50,000 lbs to LEO , you REALLY need it!
"ugh, you really need that? ok fine that stage won't return... sigh"
@BrianLynch Whats cool is, as cores hit a reuse end of life, then launch them expendable for the larger payloads.
@geoffc nice, definitely worth it
ahh yes brilliant
@BrianLynch Like so many others I saw on Reddi, I was listening/watching on headphones and started yelling when it landed and people looked at me funny.
lol yea most of my friends on FB posted "!!!!!!!!!!!!!!!!!!!!!!!", mine was "holy shit!!!!"
and then of course a bunch of photo and video shares
we need to see 3 in a row
03:28
Watching the engine flame go out, and suddenly you can see the stage, standing there and "LZ-1 the Falcon has landed"
yes I caught that and felt it was underappreciated
"the Falcon has landed"
Two cores landing in close succession, then a third coming is gonna be so damn cool to watch.
oh man I am going to hit the roof hehe
and then eventually a powered Dragon landing
Do they have the fidelity/control to target different areas of the pad with that much control? They hit the X dead one. Can they hit 3 different corners of a circle?
I am betting yes, and it is gonna so awesome to watch!
yea I'm really curious to know how much they feel they got lucky vs. how much they expected that accuracy
although I suppose the landing pad is designed with an appropriate margin
so if the expected landing error ellipse was big then the landing pad should reflect that
03:31
They hit a freaking ASDS TWICE! From a big fraction of orbital velocity.
yea true
Emphasis on hit.
and even limping over with no hydraulic fluid
03:33
Target the outer rim, and there is LOTS of room with ASDS accuracy.
inner black circle is the main pad?
This is a bad one. There is a better overlay and I did not save it.
The EIS implied concrete inner, crushed gravel outer. But they seem to have done more concrete in the end.
gotcha
and presumably those red circles outlining the ASDS pad are more indicative
03:35
They were supposed to build 4 smaller pads around the main pad, per the EIS, but that did not seem to happen.
or is the ASDS allowed to move after the boostback to accommodate more variability?
ASDS is so slow as to not make a difference.
as in the animation eh
Bigger issue is probably how close can you land a stage and not damage the core already there.
yea I see what you mean now by the 3 corners
that seems crazy risky
03:36
I am still surprised how late the legs extend. I was sure from the shape that they were going to use them for aero flight surfaces.
guess they didn't build those other pads because they know to expect good accuracy
no too far in from of the CG
front
makes for an unstable aero body
you always want the centre of lift behind the centre of mass
(well not always, fighter jets are purposely unstable)
Man, Falcon Heavy flight is going to be so cool now that you get me thinking about it. The sheer power of 3 million lbs thrust, (closest to shuttle in a while) and 27 engines all at once. Then staging, then landing two cores then landing on an ASDS. It is just gonna keep going. (Oh ya, I guess some payload to orbit, whatever...)
yea haha
like Orbcomm... huh? 7 sate-whats?
landing! landing!
27 tandem engines is indeed so sweet
@BrianLynch 7-11 who cares. THEY LANDED! Oh they delivered the mail? Ya, I guess, ok, whatever.
03:41
4.5 million lbs, forgot the uprating in latest Falcon iteration.
 
3 hours later…
06:36
Assuming you have a rocket that leaves you moving at about 10 km/s practically vertical by the time you are at an altitude of 100 km, you'll coast the rest of the way to GEO in about 6 hours. — Brian Lynch 11 mins ago
@BrianLynch You meant 11 km/s right?
10.2 should do I think
hang on I'll double check
oh so we're just using GEO sat's speed to destroy itself?
should be about 3 km/s
well I'm giving the guy a crude answer for how long it takes to get to GEO with a direct ascent
not accounting for excess velocity to impact
presumably the satellite itself is moving fast enough that you are just getting right in its way at the perfect time
yeah nearly exactly 3 km/s + Reliant Robin's top speed :)
10.66 km/s is more like it
so yea, 11 km/s :)
06:39
see? :P
just on the edge of my usual acceptable 10% margin
and I think it is more like 6.5 hours
but ballpark... hours not minutes
not a great question though
so I'm not going to bother packaging that as an answer
nope, it's awful ... and it only takes 0.119369247 seconds + time to melt with beam weapon :)
nice
has anyone ever hacked a satellite?
actually a bit more, what's the light time through the atmosphere?
well considering my 10% rule...
1c
06:45
@BrianLynch I could tell you but ...
nevermind
hahaha
let me grab my tinfoil hat
technically the ISEE-3 reboot was a hack
ah good point
06:46
because NASA lost original hardware used to communicate with it LOL
done from an old McDonald's wasn't it?
or some diner?
yeah ex McDonalds
^is that better or worse than the "first woman on the Moon"? LOL
better IMHO
I just want to delete it now hahaha
and yea I would agree
I really sided with Strickland in that debate because I thought Plata was full of hot air... but seeing that pic in his paper probably made me a bit bias from the start lol
made me laugh when David read my comment and they didn't answer it like a question but Strickland was kind of like "yes, thank you for the sentiment" or something along those lines
06:55
oh bummer I didn't hear it
I think I was just making me some tea and when I got back you and Kim were talking about it
didn't think to put me that on a tablet
that debate was lame, you didn't miss much
Strickland was basically saying you'll need more infrastructure and how actual studies have shown x y and z, while Plata was just basically saying "no you don't need that, it costs too much, you can do it more simply" but without any real backing except personal opinion
I don't think duels like that work quite OK
no it was really weird
neither of them were actual experts
my comment was this:
Werner Von Braun's original concept for a lunar mission involved an enormous vehicle that would land on the Moon and return. John Houbolt's suggestion of a lunar orbit rendezvous involving a dedicated lander was mostly dismissed until the administration realized it was the only possible option that was practical. While a large number of launches for either lunar or Mars missions might be considered ridiculous (as was the option of using a dedicated lunar lander for Apollo), we cannot dismiss it as just simply impractical based on a gut feeling when we are shocked by the costs and timeline i
but I hope they don't do similar shows like that, it is great to hear someone's perspective even though they aren't an expert (both of them clearly had done their homework at least), but trying to set it up like there will be a correct answer in the end was just awkward
you know, I think I'd comment exactly the same LOL
great minds!
07:03
there's a limit to how much can be "simplified" when each individual part of it is inherently complicated
how much can you simplify a human rated space vehicle?
yea exactly, and why does cost even play into it?
it costs what it costs, then you decide separately if you can afford it
if I don't mind a cheap piece of crap from Walmart then I'll get it to save money, but I don't complain when it breaks
so if that's what you want for your Mars mission then fine
or amortize it with whatever in all of that is making profits
"how much can you simplify a human rated space vehicle?", I would say about the size of Zond
Soyuz - orbital module
yes, I think kim pointed out that a lot of the money is spent back at home anyway, not burned as propellant
ISP of dollars?
07:06
lol
did we get an Isp for solar pressure yet? :)
Paper and LOX is about 60s isn't is?
dunno, you were suspiciously fast to come up with that!
now I imagine you are some rich mad scientist with a rocket engine burning cash in their basement
I heard something like that about model rocketry involving paper, not sure if it is true
model rocketry with LOX?!?
Not lox .
07:08
oh paper mixed with some oxidizer paste or something?
just the ox? :))
now LOX takes on a darker meaning lol
ok somebody please make an animation of tiny little ox's as particles firing out of a rocket nozzle
liquid ox? They made liquid cheese, so I don't think they're far off from liquid bovines
and I don't mean water buffalos
yep, there it is in the congealed group
ha you know how many calories are there in tic tacs?
07:12
LOL
@Hohmannfan ...so? Isp for tic tacs?
Oxidizer?
oh come on
duh!
liquid ox
I have RPA installed, so I can actually do a simulation.
haha nice
I suppose it doesn't have to be liquid
feed a ton of tic tacs to an ox, stick it in a combustion chamber, and let's see if we can take out a GEO satellite
wait, I have RPA on my windows machine, so I can not do a simulation now :(
07:16
do you have a neighbour with an ox?
a L-ox?
well I expect most people don't liquify them, but I suppose if that's all you can get
then just stir in the tic tacs
I imagine you can actually get an oxidizer from a liquefied ox, if it is ammonia-fermentated and then vacuum distilled.
on second thougth, no
^that second statement is after a quick experiment, isn't it?
Sure :P
07:21
very much a Prof. Farnsworth project
"mmmm ooh my yes, it's propelled by liquefied ox and tic tacs"
I imagine you can actually make a good rocket fuel out of things you can find in any kitchen, + liquid fluorine, of course
@TildalWave hahahaha
that is a great show, never seen it before
cool, just noticing how the series are actually alphabetical topics, not just some weird UK numbering for seasons lol
 
6 hours later…
14:01
This one is funny.
Elon Musk Song....
To be fair, gotta wonder if those bullies do live in fear... Couple of billion dollars can buy a lot of beatings in South africa... Probably even legally. :)
 
1 hour later…
15:03
@geoffc okay, in all honesty i had to turn it off rather than watch him tumble bleeding down endless stairs for 20 seconds, again.
15:46
@kimholder I listened while working, did not watch.
yeah, imho they made too much of a thing of real exaggerated drawings of him bleeding an awful lot
seems to be sort of a thing these days...
kids...
16:24
Jon Ericson on January 12, 2016
2015 was a banner year for Stack Overflow and the Stack Exchange network.
17:22
@geoffc I imagine to them it's probably a combination of "that guy isn't so great, I used to beat him up all the time" and "man... I wish I was nicer to that guy"
@duzzy You wonder if they ever drift into, "Should I be concerned, what if he is out for revenge?"
It's possible. Honestly, I think it might even be a better revenge for him to just never acknowledge them ever again.
They'll live their whole lives wondering.
17:51
@duzzy Looking over their shoulders. :)
18:43
TildalWave has added an event to this room's schedule.
^ (on 17th, The Space Show w/ Chris Stone re national security defense issues, more info: thespaceshow.com/newsletter, podcast: thespaceshow.com/content/listen-live)
i really want to ask good questions on that show. something that looks further into the future but still not too speculative
(for no particular reason at all... nope....)
He's got quite some references doesn't he? Still, he's not a SEx.SE ADCO :)
Space Exploration Stack Exchange Attitude Determination and Control Officer
2
I gotta add that to my LinkedIn LOL
@TildalWave, do you know if/how I can get a recording of a previous SSERVI workshop?
@BrianLynch which one?
18:58
although I suddenly realize each individual talk has a "playback" button
yeah :)
ISS Expedition 46 Spacewalk Preview Briefing is now webcast live on NASA TV. More info here
19:12
@BrianLynch if you're gonna answer this one space.stackexchange.com/questions/13323/… I now edited my comment with direct links
 
1 hour later…
20:34
cool, I can probably answer
i could also go through the talks and summarize, but you are really more qualified
20:53
@geoffc You use suse for work, right?
@duzzy As a server OS mostly.
Ah, okay.

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