Meecrob Posted April 16, 2023 Share Posted April 16, 2023 I'd imagine there is also an inertial guidance unit in there somewhere at least for backup within LEO, and possibly for development of the guidance system for Starship beyond LEO. Quote Link to comment Share on other sites More sharing options...
magnemoe Posted April 16, 2023 Share Posted April 16, 2023 34 minutes ago, Meecrob said: I'd imagine there is also an inertial guidance unit in there somewhere at least for backup within LEO, and possibly for development of the guidance system for Starship beyond LEO. Pretty sure its an inertial guidance unit who kicks in if gps signals are spotty who can be an problem during reentry and definitely will be an problem on Starship. Even google map on an phones uses that as it makes sense in tunnels unless its to long. Its also an reason gps jamming of bombs, missiles and shells has limited efficiency. You start adjusting your trajectory after the gps data early and if gps falls out you are already on an pretty good trajectory. I also assume it sanity checks the gps data so it you get something weird like you are 1000 km east its get dumped. Quote Link to comment Share on other sites More sharing options...
RCgothic Posted April 16, 2023 Share Posted April 16, 2023 I'm pretty sure S2 also has star trackers for attitude determination. Not sure S1 would need such. Quote Link to comment Share on other sites More sharing options...
stephensmat Posted April 16, 2023 Share Posted April 16, 2023 According to The Launch Pad, it's 14 hours away. It's first thing in the morning where I am. I get to watch this tonight. For me, the Launch is today., First time that Time Zones have lined up for me on a major flight test. Quote Link to comment Share on other sites More sharing options...
stephensmat Posted April 16, 2023 Share Posted April 16, 2023 SpaceX's official channel goes live in 12 hours. Quote Link to comment Share on other sites More sharing options...
StrandedonEarth Posted April 16, 2023 Share Posted April 16, 2023 Hmm, setting my alarm for the time the stream starts would only be fifteen minutes earlier than usual. I guess I should make it twenty so I can feed the animals and pour my coffee Quote Link to comment Share on other sites More sharing options...
Meecrob Posted April 16, 2023 Share Posted April 16, 2023 (edited) 1 hour ago, magnemoe said: Pretty sure its an inertial guidance unit who kicks in if gps signals are spotty who can be an problem during reentry and definitely will be an problem on Starship. Even google map on an phones uses that as it makes sense in tunnels unless its to long. Its also an reason gps jamming of bombs, missiles and shells has limited efficiency. You start adjusting your trajectory after the gps data early and if gps falls out you are already on an pretty good trajectory. I also assume it sanity checks the gps data so it you get something weird like you are 1000 km east its get dumped. Also, GPS is a signal that can be lost or jammed. IGU is self contained. I think I am missing something here...but it seems to me (obviously I'm NOT a rocket scientist) that GPS is a dead end for space. What do you do between the GPS of Earth and the GPS of the Moon or Mars or any other destination in the solar system that we hypothetically set up a GPS around? Have a "Milky-Way Positioning System" out by the Oort cloud? Edited April 16, 2023 by Meecrob Quote Link to comment Share on other sites More sharing options...
darthgently Posted April 17, 2023 Share Posted April 17, 2023 (edited) Not very technical interview below, but reiterates the tone Musk is trying to set for this upcoming attempt. I'm thinking of it as Starship Early Access now, with no expectations of it being smoothly playable in the short, or medium, term. https://twitter.com/esherifftv/status/1647754805413138438?t=e8n_o7mvZxcym542F5YW8g&s=19 The big upside, of course, is Ellie finally got that interview with Musk Edited April 17, 2023 by darthgently Quote Link to comment Share on other sites More sharing options...
tater Posted April 17, 2023 Share Posted April 17, 2023 Quote Link to comment Share on other sites More sharing options...
stephensmat Posted April 17, 2023 Share Posted April 17, 2023 Everyday Astronaut just reported that the launch was pushed back an hour. Quote Link to comment Share on other sites More sharing options...
tater Posted April 17, 2023 Share Posted April 17, 2023 Quote Link to comment Share on other sites More sharing options...
tater Posted April 17, 2023 Share Posted April 17, 2023 Quote Link to comment Share on other sites More sharing options...
steve9728 Posted April 17, 2023 Share Posted April 17, 2023 Sorry Musk, I'm the 3.2% Quote Link to comment Share on other sites More sharing options...
Beccab Posted April 17, 2023 Share Posted April 17, 2023 Tank farm is spooling up! T-3 hours 24 minutes till liftoff for now Quote Link to comment Share on other sites More sharing options...
RCgothic Posted April 17, 2023 Share Posted April 17, 2023 NASA WB57 observation aircraft is now airborne and en-route to Starbase. Quote Link to comment Share on other sites More sharing options...
Meecrob Posted April 17, 2023 Share Posted April 17, 2023 (edited) 2 minutes ago, RCgothic said: NASA WB57 observation aircraft is now airborne and en-route to Starbase. ...showing off its got a bigger gas tank than my car if its launching this early. Edit: seriously, is it landing there or orbiting the launch site? Edited April 17, 2023 by Meecrob Quote Link to comment Share on other sites More sharing options...
darthgently Posted April 17, 2023 Share Posted April 17, 2023 2 hours ago, steve9728 said: Sorry Musk, I'm the 3.2% As Musk is defining success for this, not exploding like N1 will be a success. "The payload is information [ gathered ]" Quote Link to comment Share on other sites More sharing options...
Scotius Posted April 17, 2023 Share Posted April 17, 2023 I will be at work. Hopefully everything will go well. If not, at least fireball should be impressive. Go Starship! Quote Link to comment Share on other sites More sharing options...
Beccab Posted April 17, 2023 Share Posted April 17, 2023 Still no prop load, currently they're roughly 12 minutes behind schedule if they started now Quote Link to comment Share on other sites More sharing options...
RCgothic Posted April 17, 2023 Share Posted April 17, 2023 21 minutes ago, Meecrob said: ...showing off its got a bigger gas tank than my car if its launching this early. Edit: seriously, is it landing there or orbiting the launch site? It'll fly above Starbase and the gulf for a while to observe the launch and then return to the runway it took off from. It appears that fuelling of Starship is yet to start, so T-0 looks like it's slipping later into the window. Quote Link to comment Share on other sites More sharing options...
Meecrob Posted April 17, 2023 Share Posted April 17, 2023 (edited) Thanks! But I mean its flight endurance...I know its got long legs and will be filming the test attempt, but taking off early to observe the starship flight is confusing me....Unless they launch to texas, then refuel, then launch for the photo flight. But I'm just guessing. Edited April 17, 2023 by Meecrob Quote Link to comment Share on other sites More sharing options...
RCgothic Posted April 17, 2023 Share Posted April 17, 2023 Go for prop load! T-0 has slipped 20m. Fuelling has begun: 7 minutes ago, Meecrob said: Thanks! But I mean its flight endurance...I know its got long legs and will be filming the test attempt, but taking off early to observe the starship flight is confusing me....Unless they launch to texas, then refuel, then launch for the photo flight. But I'm just guessing. WB57s have a flight endurance of about 6.5h. Minus an hour to and from, that's 4.5h availability over the launch site. And as you mention it can always land in South Texas if it needs to stay up a little bit longer. Should easily cover the entire flight window. Quote Link to comment Share on other sites More sharing options...
sevenperforce Posted April 17, 2023 Share Posted April 17, 2023 13 minutes ago, RCgothic said: Go for prop load! T-0 has slipped 20m. Fuelling has begun: WB57s have a flight endurance of about 6.5h. Minus an hour to and from, that's 4.5h availability over the launch site. And as you mention it can always land in South Texas if it needs to stay up a little bit longer. Should easily cover the entire flight window. What about the re-entry observation over Hawaii? It can’t get that far west that fast. Quote Link to comment Share on other sites More sharing options...
Gargamel Posted April 17, 2023 Share Posted April 17, 2023 (edited) :popcorn: I might have missed it up thread, but I’m assuming the flight path is mainly over water until orbit planned reentry is established just in case it’s not? edit: I misspoke, having been advised it’s not an orbital flight. Question still stands though I fully expect a scrub, followed by a strong chance of RUD, and then a decent possibility of a successful mission. Edited April 17, 2023 by Gargamel Quote Link to comment Share on other sites More sharing options...
Spaceception Posted April 17, 2023 Share Posted April 17, 2023 (edited) Upper stage is fueling Launch in about an hour, so livestream will be up in ~10-15 minutes?https://twitter.com/elonmusk/status/1647937628808040448?t=buUmlLW9UL9kiflIJ3ji3Q&s=19 Edited April 17, 2023 by Spaceception Quote Link to comment Share on other sites More sharing options...
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