Spaceception Posted June 25, 2017 Share Posted June 25, 2017 Just now, StupidAndy said: Wikipedia has an accurate page, just its in UTC https://en.wikipedia.org/wiki/List_of_Falcon_9_and_Falcon_Heavy_launches I was scrolling though my Twitter feed, and I was just about to post Quote Link to comment Share on other sites More sharing options...
CatastrophicFailure Posted June 25, 2017 Share Posted June 25, 2017 This is interesting, haven't seen it mentioned here: Apparently this latest was the first successful 3-engined landing (all the others used a single engine or went... badly). Quote Link to comment Share on other sites More sharing options...
Motokid600 Posted June 25, 2017 Share Posted June 25, 2017 If i recall correctly there have been successful three engine landings in the past, but not all the way to the deck. Two shutdown a few seconds prior. Was this all the way? Quote Link to comment Share on other sites More sharing options...
Lukaszenko Posted June 25, 2017 Share Posted June 25, 2017 http://spacexstats.xyz/#NextLaunch Seems not everybody knows about this link. Quote Link to comment Share on other sites More sharing options...
Scotius Posted June 25, 2017 Share Posted June 25, 2017 So. It's still June, and SpaceX already launched almost as many rockets as through entire 2016. Nice. Of course it have much to do with accidents occuring last year, which caused delays. Quote Link to comment Share on other sites More sharing options...
sevenperforce Posted June 25, 2017 Share Posted June 25, 2017 10 hours ago, sojourner said: Those are the new titanium grid fins. YESSSSSSS. I have been waiting for this. Quote Link to comment Share on other sites More sharing options...
sevenperforce Posted June 25, 2017 Share Posted June 25, 2017 4 hours ago, Motokid600 said: If i recall correctly there have been successful three engine landings in the past, but not all the way to the deck. Two shutdown a few seconds prior. Was this all the way? If so, it could explain why it came down so nearly off the deck, and then crushed the legs. A three-engine shutdown could easily have air-launched and ended up dropping from a few meters above the deck. Quote Link to comment Share on other sites More sharing options...
Kryten Posted June 25, 2017 Share Posted June 25, 2017 JRTI is too far from the applied-for landing area to arrive in time for the launch. The launch is probably going to be delayed. Quote Link to comment Share on other sites More sharing options...
sevenperforce Posted June 25, 2017 Share Posted June 25, 2017 https://mobile.twitter.com/elonmusk/status/878828849722671104 Apparently it was def an anomaly. 1 minute ago, Kryten said: JRTI is too far from the applied-for landing area to arrive in time for the launch. The launch is probably going to be delayed. Seems unlikely. Quote Link to comment Share on other sites More sharing options...
sevenperforce Posted June 25, 2017 Share Posted June 25, 2017 Whoa, really freaking cool: The new Block V titanium grid fins are curved. They're also substantially larger than the original aluminum ones. Quote Link to comment Share on other sites More sharing options...
Jaff Posted June 25, 2017 Share Posted June 25, 2017 (edited) Kinda ruins the look though i understand paint costs d/v Edited June 25, 2017 by Jaff Quote Link to comment Share on other sites More sharing options...
Spaceception Posted June 25, 2017 Share Posted June 25, 2017 4 hours ago, Lukaszenko said: http://spacexstats.xyz/#NextLaunch Seems not everybody knows about this link. Quickest turnaround is 13 days, what does that mean? I don't recall SpaceX launching a reused rocket that quickly, or is that the time for them to get a recovered stage firing again? Quote Link to comment Share on other sites More sharing options...
tater Posted June 25, 2017 Share Posted June 25, 2017 7 minutes ago, Spaceception said: Quickest turnaround is 13 days, what does that mean? I don't recall SpaceX launching a reused rocket that quickly, or is that the time for them to get a recovered stage firing again? It's just timing between launches, it has nothing at all to do with booster turn around. Quote Link to comment Share on other sites More sharing options...
sevenperforce Posted June 25, 2017 Share Posted June 25, 2017 35 minutes ago, Jaff said: Kinda ruins the look though i understand paint costs d/v I, for one, welcome our new high-contrast robotic spaceship overlords. Quote Link to comment Share on other sites More sharing options...
Spaceception Posted June 25, 2017 Share Posted June 25, 2017 Roughly 4 hours! Quote Link to comment Share on other sites More sharing options...
Technical Ben Posted June 25, 2017 Share Posted June 25, 2017 2 hours ago, sevenperforce said: https://mobile.twitter.com/elonmusk/status/878828849722671104 Apparently it was def an anomaly. Seems unlikely. Not all 3 engines shut off at the same time? Waves on the sea? Quote Link to comment Share on other sites More sharing options...
CatastrophicFailure Posted June 25, 2017 Share Posted June 25, 2017 8 hours ago, Motokid600 said: If i recall correctly there have been successful three engine landings in the past, but not all the way to the deck. Two shutdown a few seconds prior. Was this all the way? As I understand it based on a single Facebook comment on a moderately trustworthy website, yes. ?!? Oh for flarp's flarping sake! How in the great furry flying flarp am I out of likes for the day already?! I just got up, dagnabbit! Quote Link to comment Share on other sites More sharing options...
sevenperforce Posted June 25, 2017 Share Posted June 25, 2017 42 minutes ago, Technical Ben said: Not all 3 engines shut off at the same time? Waves on the sea? Elon said it was either a mechanical problem or a very large wind gust. Asymmetric shutdown could be the mechanical problem. I suppose we could calculate force gradients during engine shutdown from existing videos but it would be a lot of guesswork. On the subject of the grid fins, Elon stated that the old painted aluminum ones never were so damaged as to lose control authority, but they were always "fragged", i.e., too melty to be reused. The titanium ones provide a little extra control authority (which will help later, with FH) and are completely reusable without refurb. By this I assume we can conclude that even with the two reused rockets so far, none of the grid fins were original. Quote Link to comment Share on other sites More sharing options...
Lukaszenko Posted June 25, 2017 Share Posted June 25, 2017 (edited) 5 hours ago, sevenperforce said: Whoa, really freaking cool: The new Block V titanium grid fins are curved. They're also substantially larger than the original aluminum ones. Interesting. I thought that the computer would know more or less how the rocket will react when it tilts and twists the grid fins. But, here it looks like they just came in and slapped on some bigger & curvier fins and they still expect the rocket to return no problem. I guess it implies that the computer basically learns how to control the rocket on the fly. It makes sense; so many variables are always changing. I wonder if, for example, half a grid fin got ripped off, would the computer be able to adjust for it? Edited June 25, 2017 by Lukaszenko Quote Link to comment Share on other sites More sharing options...
Steel Posted June 25, 2017 Share Posted June 25, 2017 8 minutes ago, Lukaszenko said: Interesting. I thought that the computer would know more or less how the rocket will react to when it tilts and twists the grid fins. But, here it looks like they just came in and slapped on some bigger & curvier fins and they still expect the rocket to return no problem. I guess it implies that the computer basically learns how to control the rocket on the fly... Or, if we assume this was done by professional engineers rather than monkeys, maybe it could suggest that they've extensively simulated and tested these new grid fins and have updated the software with new parameters? Quote Link to comment Share on other sites More sharing options...
magnemoe Posted June 25, 2017 Share Posted June 25, 2017 24 minutes ago, Steel said: Or, if we assume this was done by professional engineers rather than monkeys, maybe it could suggest that they've extensively simulated and tested these new grid fins and have updated the software with new parameters? WIll assume so, the curving is probably done for some reasons, like distribute stress or heating over the surface. First I assumed they was curved to follow the rocet diameter but they are curved in the in-out direction not sideways. A bit weird they are not covered, think they would add some air resistance even then folded. A simple fiberglass or cheat metal cover should help. Quote Link to comment Share on other sites More sharing options...
StrandedonEarth Posted June 25, 2017 Share Posted June 25, 2017 10 minutes ago, magnemoe said: A bit weird they are not covered, think they would add some air resistance even then folded. A simple fiberglass or cheat metal cover should help. A bit, but then that's extra parts, throwaway or complex, and weight, probably not worth it the hassle or expense. The curve appears to be for aerodynamics. Quote Link to comment Share on other sites More sharing options...
Spaceception Posted June 25, 2017 Share Posted June 25, 2017 (edited) 16 minutes ago, magnemoe said: WIll assume so, the curving is probably done for some reasons, like distribute stress or heating over the surface. First I assumed they was curved to follow the rocet diameter but they are curved in the in-out direction not sideways. A bit weird they are not covered, think they would add some air resistance even then folded. A simple fiberglass or cheat metal cover should help. That might cut into the payload fraction, I mean, an aerodynamic cover with some sort of decoupler, that has to take at least a few hundred kilos off the max payload (Or I'm just overthinking it) and on top of that, it adds something else they have to replace. Ninja'd by @StrandedonEarth Edited June 25, 2017 by Spaceception Quote Link to comment Share on other sites More sharing options...
sevenperforce Posted June 25, 2017 Share Posted June 25, 2017 Even sexier pic: As you can see, they ARE curved around the stage, plus they have awesome leading-edge sharp points to break up airflow. Quote Link to comment Share on other sites More sharing options...
Steel Posted June 25, 2017 Share Posted June 25, 2017 (edited) 6 minutes ago, sevenperforce said: Even sexier pic: [PICTURE] 6 minutes ago, sevenperforce said: As you can see, they ARE curved around the stage, plus they have awesome leading-edge sharp points to break up airflow. Now those are some sexy grid fins... So the new shape is definitely for aerodynamic reasons while ascending. Edited June 25, 2017 by Steel Quote Link to comment Share on other sites More sharing options...
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