sevenperforce Posted February 6, 2018 Share Posted February 6, 2018 13 minutes ago, CatastrophicFailure said: ...3:45 shalt be the number thou shalt launch at, and the number thou shalt launch at shall be 3:45. 3:46 shalt thou not count, nor either count thou 3:44, excepting that thou then proceed to 3:45. 3:46 is right out, as are scrubs, delays, unnecessary explosions, or other such nonsense. Amen. LIKE LIKE LIKE LIKE LIKE Quote Link to comment Share on other sites More sharing options...
DrLicor Posted February 6, 2018 Share Posted February 6, 2018 @qzgy:" Lightning and wind are the primary weather concerns that preclude rocket launch. A rocket's control system needs to compensate for lots of un-modeled or difficult to model factors. For example, uncertainty in mass properties, engine performance, mechanical alignments, errors in inertial measurement units (IMU), gyroscopes, GPS, etc. If any of these errors become too large the system will not longer be able to compensate, the system will become uncontrollable, and the mission will be lost. Wind, unsurprisingly, is one of these uncertain factors, and especially wind shears, which are rapid changes in wind direction as a function of location, are difficult for control systems to handle because they can put enormous aerodynamic loads on a vehicle very quickly. Lightning is dangerous for entirely different reasons. Rockets are full of sensitive electronics, attract lightning nicely (even when not grounded), and are vulnerable to direct lightning strike. Even something as typically benign as a reset or temporarily glitch that could potentially be tolerated in a satellite would be disastrous to a rocket under powered flight. Airplanes avoid lightning storms for the same reason, although they have more margin available to incorporate lightning mitigation into their designs. For these reasons (and to a lesser extent others, such as the extreme temperature example provided in another answer), rockets launches are frequently delayed for ideal conditions. There's no sense in risking a rocket and payload worth hundreds of millions of dollars for a week. In contrast, rockets that must be able to be launched in at a moments notice (think ICBMs and SLBMs) are designed with very different requirements. Here, the performance hit taken to design robustness to weather is accepted because a weapon isn't very useful if you have to wait for the storm to pass before it can be fired. " Quote Link to comment Share on other sites More sharing options...
sevenperforce Posted February 6, 2018 Share Posted February 6, 2018 9 minutes ago, qzgy said: Mind if I ask, but what fails if we have these high upper level winds? Is it a structural thing or is it something with guidance/control? It's structural. Differential wind shear can rip a high-fineness rocket apart. Two minutes to fueling poll. Quote Link to comment Share on other sites More sharing options...
CatastrophicFailure Posted February 6, 2018 Share Posted February 6, 2018 Go for prop load! Quote Link to comment Share on other sites More sharing options...
sevenperforce Posted February 6, 2018 Share Posted February 6, 2018 WE ARE GO FOR PROP LOAD For reference, this means we now have chillled RP-1 flowing into all three first-stage cores. LOX and upper-stage loading comes later. Quote Link to comment Share on other sites More sharing options...
ArkaelDren Posted February 6, 2018 Share Posted February 6, 2018 SpaceX youtube lobby is gaining 3-4k every 30-45 seconds now. PROP LOAD here we come. Quote Link to comment Share on other sites More sharing options...
sevenperforce Posted February 6, 2018 Share Posted February 6, 2018 4 minutes ago, ArkaelDren said: SpaceX youtube lobby is gaining 3-4k every 30-45 seconds now. PROP LOAD here we come. 454k right now. Quote Link to comment Share on other sites More sharing options...
insert_name Posted February 6, 2018 Share Posted February 6, 2018 current launch is within my lunch break, but just barely, i am now hoping for no more delays, or 24h scrub Quote Link to comment Share on other sites More sharing options...
cubinator Posted February 6, 2018 Share Posted February 6, 2018 I am staying at school during the launch and getting a ride home afterwards. The only issue is catching the pre-launch webcast, which starts during class. Quote Link to comment Share on other sites More sharing options...
ArkaelDren Posted February 6, 2018 Share Posted February 6, 2018 Imagine wind shear of 2-300ft. Now imagine a massive test rocket at MaxQ travelling through it. You think air is soft and fluffy??? Quote Link to comment Share on other sites More sharing options...
StrandedonEarth Posted February 6, 2018 Share Posted February 6, 2018 Well, I have the livestream cued up on my phone ready to hit play. Hope I get the chance Quote Link to comment Share on other sites More sharing options...
DAL59 Posted February 6, 2018 Share Posted February 6, 2018 Yay! I thought I missed it. Quote Link to comment Share on other sites More sharing options...
Scotius Posted February 6, 2018 Share Posted February 6, 2018 4 minutes ago, ArkaelDren said: Imagine wind shear of 2-300ft. Now imagine a massive test rocket at MaxQ travelling through it. You think air is soft and fluffy??? About as soft and fluffy as an avalanche hitting you in the face :D. And avalanche is much slower LOL. Quote Link to comment Share on other sites More sharing options...
DAL59 Posted February 6, 2018 Share Posted February 6, 2018 https://twitter.com/alexjamesfitz/status/960918869950058496 Quote Link to comment Share on other sites More sharing options...
Just Jim Posted February 6, 2018 Share Posted February 6, 2018 (edited) Rats, there's just enough cloud cover we're not going to be able to see anything outside... But I heard this morning on the news we might get a sonic boom or two... not sure if we'll hear it all the way over here, but who knows... Edited February 6, 2018 by Just Jim Quote Link to comment Share on other sites More sharing options...
qzgy Posted February 6, 2018 Share Posted February 6, 2018 Just now, Just Jim said: here *hear Quote Link to comment Share on other sites More sharing options...
CatastrophicFailure Posted February 6, 2018 Share Posted February 6, 2018 1 minute ago, DAL59 said: https://twitter.com/alexjamesfitz/status/960918869950058496 Gotta right click then paste that as “plain text.” Quote Link to comment Share on other sites More sharing options...
Just Jim Posted February 6, 2018 Share Posted February 6, 2018 1 minute ago, qzgy said: *hear opps... stupid auto-correct... Quote Link to comment Share on other sites More sharing options...
CatastrophicFailure Posted February 6, 2018 Share Posted February 6, 2018 Just now, Just Jim said: opps... stupid auto-correct... Hear here! Quote Link to comment Share on other sites More sharing options...
qzgy Posted February 6, 2018 Share Posted February 6, 2018 While we wait, something to fill the gaps. Quote Link to comment Share on other sites More sharing options...
DAL59 Posted February 6, 2018 Share Posted February 6, 2018 Sketchfab Bet you didn't know the forums could do that! Quote Link to comment Share on other sites More sharing options...
ArkaelDren Posted February 6, 2018 Share Posted February 6, 2018 (edited) Jim enjoy the view. Either way you will get to "hear" the heavy regardless. BTW: I am very jealous of you right now. Just broke 500k in lobby. Edited February 6, 2018 by ArkaelDren Quote Link to comment Share on other sites More sharing options...
Nightfury Posted February 6, 2018 Share Posted February 6, 2018 Just now, ArkaelDren said: Jim enjoy the view. Either way you will get to "hear" the heavy regardless. BTW: I am very jealous of you right now. You're not alone Quote Link to comment Share on other sites More sharing options...
DAL59 Posted February 6, 2018 Share Posted February 6, 2018 Exactly an hour to go! Quote Link to comment Share on other sites More sharing options...
Firemetal Posted February 6, 2018 Share Posted February 6, 2018 3 minutes ago, DAL59 said: Sketchfab Bet you didn't know the forums could do that! If only this was a KSP part mod... Fire Quote Link to comment Share on other sites More sharing options...
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