KerbonautInTraining Posted December 21, 2015 Share Posted December 21, 2015 (edited) I think the fairing might provide structural support. I heard somewhere that the 2nd stage can get up to 6G's just before cutoff. [Citation needed] Also, T-6 hours Edited December 21, 2015 by KerbonautInTraining Link to comment Share on other sites More sharing options...
Frida Space Posted December 21, 2015 Share Posted December 21, 2015 (edited) Just want to add something that might be overlooked but that is actually of critical importance: after sat deployment, the upgraded second stage will test its reignition capability, which will be fundamental for the next launch (SES-9). Edited December 21, 2015 by Frida Space Link to comment Share on other sites More sharing options...
Kartoffelkuchen Posted December 21, 2015 Share Posted December 21, 2015 (edited) 10 minutes ago, KerbonautInTraining said: I think the fairing might provide structural support. I heard somewhere that the 2nd stage can get up to 6G's just before cutoff. [Citation needed] Also, T-6 hours Yeah, though the 2nd stage can throttle down to 39% which should lower the loads on the payload quite much. But the question now comes up, SpaceX already launched 6 of those satellites for Orbcomm, and there the payload weighted much less. OK, the engines were upgraded to now run at their maximal thrust setting, but that can't change the acceleration by that much that SpaceX lets the fairings on the launch vehicle until SECO, since on their first orbcomm mission, the fairings were deployed as usual (shortly after stage 2 ignition), right? EDIT: "Falcon 9 fairing separation time clarified. As expected, fairing comes off just after 2nd stage ignition about 3 minutes into flight." - Stephen Clark on Twitter So yeah, seems like a simple printing error. A very strange on though... Edited December 21, 2015 by Kartoffelkuchen Link to comment Share on other sites More sharing options...
justidutch Posted December 21, 2015 Share Posted December 21, 2015 (edited) does anyone have an idea of how much velocity is lost during the 15 second delay of first stage engine cutoff and second stage engine start? Edited December 21, 2015 by justidutch Link to comment Share on other sites More sharing options...
Motokid600 Posted December 21, 2015 Share Posted December 21, 2015 58 minutes ago, justidutch said: does anyone have an idea of how much velocity is lost during the 15 second delay of first stage engine cutoff and second stage engine start? Can't be much at all if the airs thin enough for the first stage to do an about-face at a few thousand m/s. Maybe a dozen m/s? Negligible. Link to comment Share on other sites More sharing options...
Hcube Posted December 21, 2015 Share Posted December 21, 2015 1 hour ago, justidutch said: does anyone have an idea of how much velocity is lost during the 15 second delay of first stage engine cutoff and second stage engine start? There's close to no drag, and it may even be a gain in efficiency if the 2nd stage comes closer to apoapsis and has a high enough TWR (i think) Link to comment Share on other sites More sharing options...
Zucal Posted December 21, 2015 Share Posted December 21, 2015 Our first look at LZ-1. Link to comment Share on other sites More sharing options...
CatastrophicFailure Posted December 21, 2015 Share Posted December 21, 2015 Wow, that certainly puts it into perspective. Thats GOTTA be easier to land on than a barge! Link to comment Share on other sites More sharing options...
Frybert Posted December 21, 2015 Share Posted December 21, 2015 Now with any luck our next look would be with a rocket where the person is. Hopefully in one piece. Link to comment Share on other sites More sharing options...
KerbonautInTraining Posted December 21, 2015 Share Posted December 21, 2015 Wait so is the launch gonna happen in darkness? Wondering if I should pull up the live stream on my living room TV Link to comment Share on other sites More sharing options...
Frybert Posted December 22, 2015 Share Posted December 22, 2015 13 minutes ago, KerbonautInTraining said: Wait so is the launch gonna happen in darkness? Indeed, Its a real shame they couldn't do it on Saturday when I could have actually made it out to watch in person. Link to comment Share on other sites More sharing options...
Wingman703 Posted December 22, 2015 Share Posted December 22, 2015 Considering that nightfall is around 6:30 here... yeah, launch and landing will be in darkness. Makes it easy to see the re-ignition of the first stage! Link to comment Share on other sites More sharing options...
Frida Space Posted December 22, 2015 Share Posted December 22, 2015 (edited) 1 hour ago, Wingman703 said: yeah, launch and landing will be in darkness. Makes it easy to see the re-ignition of the first stage! and.... explosions! but let's hope there will be none tonight Go Falcon, Go SpaceX! Edited December 22, 2015 by Frida Space Link to comment Share on other sites More sharing options...
KerbonautInTraining Posted December 22, 2015 Share Posted December 22, 2015 12 minutes ago, Wingman703 said: Makes it easy to see the re-ignition of the first stage! Assuming the cloud cover isn't too bad, I heard some people talking about it earlier. Link to comment Share on other sites More sharing options...
Mitchz95 Posted December 22, 2015 Share Posted December 22, 2015 So it looks like the webcast won't start until about 8:28 EST. Five minutes before launch. Link to comment Share on other sites More sharing options...
Wingman703 Posted December 22, 2015 Share Posted December 22, 2015 Stream is up, but just showing the SpaceX logo. Link to comment Share on other sites More sharing options...
Three1415 Posted December 22, 2015 Share Posted December 22, 2015 Stream just became active (nothing actually on it at time of posting, other than background music)...Suspense building....*Gnaws on fingers* Link to comment Share on other sites More sharing options...
Rithsom Posted December 22, 2015 Share Posted December 22, 2015 It seems to be live. Here's hoping for a successful launch and RTLS landing! Link to comment Share on other sites More sharing options...
Wingman703 Posted December 22, 2015 Share Posted December 22, 2015 Stream is live, just pre-launch propaganda/information however. Link to comment Share on other sites More sharing options...
Delta_8930 Posted December 22, 2015 Share Posted December 22, 2015 Now we're rolling! Go Orbcomm! Go SpaceX! Link to comment Share on other sites More sharing options...
Frida Space Posted December 22, 2015 Share Posted December 22, 2015 1 hour ago, Mitchz95 said: So it looks like the webcast won't start until about 8:28 EST. Five minutes before launch. Launch is at 8:29 pm EST. Webcast has already started! Link to comment Share on other sites More sharing options...
YoetoJoe Posted December 22, 2015 Share Posted December 22, 2015 They are live streaming the landing. Thats a first. Link to comment Share on other sites More sharing options...
Frybert Posted December 22, 2015 Share Posted December 22, 2015 Alright guys, while I wasn't going to make it out to the coast, I'm still going to go to a field near me where I should be able to get some decent long distance pictures. I just took a look outside and there is some cloud cover so I don't know how high quality, but I am going to try to go for SOMETHING. Link to comment Share on other sites More sharing options...
SpaceXray Posted December 22, 2015 Share Posted December 22, 2015 (edited) Wow they turned a rocket launch stream into a show, nice! Something fun to watch before the launch. Edited December 22, 2015 by SpaceXray Link to comment Share on other sites More sharing options...
Mazon Del Posted December 22, 2015 Share Posted December 22, 2015 Can someone provide me with a link to the webcast? Every one I can find takes me to the launch that exploded. Link to comment Share on other sites More sharing options...
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