CatastrophicFailure Posted June 24, 2017 Share Posted June 24, 2017 3 minutes ago, StupidAndy said: what's a crush core? The F9 legs have internal "cores" made of aluminum honeycomb. Think a shock absorber that can only move once. On a hard landing, the crush core gets smushed-by design-thereby absorbing energy and saving more important components (like the engines). They tried using the engine as a shock absorber on a couple of the Apollo landings, turns out it was a bad idea. A tweet from Elon said they can replace a crush core in just a couple of hours. Quote Link to comment Share on other sites More sharing options...
StupidAndy Posted June 24, 2017 Share Posted June 24, 2017 Just now, CatastrophicFailure said: The F9 legs have internal "cores" made of aluminum honeycomb. Think a shock absorber that can only move once. On a hard landing, the crush core gets smushed-by design-thereby absorbing energy and saving more important components (like the engines). They tried using the engine as a shock absorber on a couple of the Apollo landings, turns out it was a bad idea. A tweet from Elon said they can replace a crush core in just a couple of hours. I should read into this, don't exactly know what a shock absorber is, TO WIKIPEDIA! oh and thanks Quote Link to comment Share on other sites More sharing options...
CatastrophicFailure Posted June 24, 2017 Share Posted June 24, 2017 3 minutes ago, StupidAndy said: I should read into this, don't exactly know what a shock absorber is, TO WIKIPEDIA! oh and thanks Lol, ok technically what you're looking for on wiki is a damper, but on cars everyone calls them shock absorbers. It's a tube sliding inside another. Vaguely like this: But at the bottom of the outer tube, you have a slug of aluminum honeycomb. This part of the leg collapses on impact, absorbing it. Quote Link to comment Share on other sites More sharing options...
StupidAndy Posted June 24, 2017 Share Posted June 24, 2017 Just now, CatastrophicFailure said: Lol, ok technically what you're looking for on wiki is a damper, but on cars everyone calls them shock absorbers. It's a tube sliding inside another. Vaguely like this: But at the bottom of the outer tube, you have a slug of aluminum honeycomb. This part of the leg collapses on impact, absorbing it. is it like those parts of a car that crumple to reduce shock? crumple zones? Quote Link to comment Share on other sites More sharing options...
CatastrophicFailure Posted June 24, 2017 Share Posted June 24, 2017 27 minutes ago, StupidAndy said: is it like those parts of a car that crumple to reduce shock? crumple zones? Exact same concept, but looks like a tube. Quote Link to comment Share on other sites More sharing options...
StupidAndy Posted June 24, 2017 Share Posted June 24, 2017 Just now, CatastrophicFailure said: Exact same concept, but looks like a tube. and honeycomb? if so then I got it now, thanks! Quote Link to comment Share on other sites More sharing options...
KSK Posted June 24, 2017 Share Posted June 24, 2017 6 hours ago, CatastrophicFailure said: So, given that the landing was hard enough to crush all 4 crush cores, that barge must have really felt it. The question now is, will they have to change the name? Oooh - there are so many good ones to choose from Only Slightly Bent would be an obvious choice, although Screw Loose (along with a bunch of other stuff I imagine) might work or possibly So Much for Subtlety. Lasting Damage is probably a bit direct. In fact calling it that would have Very Little Gravitas Indeed. I'll stop now - I love Culture ship names though. Quote Link to comment Share on other sites More sharing options...
Skylon Posted June 24, 2017 Author Share Posted June 24, 2017 (edited) 14 minutes ago, KSK said: Oooh - there are so many good ones to choose from Only Slightly Bent would be an obvious choice, although Screw Loose (along with a bunch of other stuff I imagine) might work or possibly So Much for Subtlety. Lasting Damage is probably a bit direct. In fact calling it that would have Very Little Gravitas Indeed. I'll stop now - I love Culture ship names though. How about Funny, It Worked Last Time You'll Thank Me Later (The barge) Size Isn't Everything Someone Else's Problem Fine Until You Came Along (the barge was) Wow that wiki page is a goldmine for barge names. Edited June 24, 2017 by Skylon Quote Link to comment Share on other sites More sharing options...
CatastrophicFailure Posted June 24, 2017 Share Posted June 24, 2017 And hot on the heels of today's success, Intelsat 35e and SES 11 both delayed, no new date specified. via spaceflightnow.com Quote Link to comment Share on other sites More sharing options...
Scotius Posted June 24, 2017 Share Posted June 24, 2017 I vote for Tough Love. Quote Link to comment Share on other sites More sharing options...
TheEpicSquared Posted June 24, 2017 Share Posted June 24, 2017 5 minutes ago, Scotius said: I vote for Tough Love. I vote for "Only Slightly Bent". Quote Link to comment Share on other sites More sharing options...
magnemoe Posted June 24, 2017 Share Posted June 24, 2017 6 hours ago, CatastrophicFailure said: Lol, ok technically what you're looking for on wiki is a damper, but on cars everyone calls them shock absorbers. It's a tube sliding inside another. Vaguely like this: But at the bottom of the outer tube, you have a slug of aluminum honeycomb. This part of the leg collapses on impact, absorbing it. Do the legs has standard dampers too? i Thought the cylinders who lower the legs worked as shock absorbers. Quote Link to comment Share on other sites More sharing options...
softweir Posted June 24, 2017 Share Posted June 24, 2017 2 hours ago, magnemoe said: Do the legs has standard dampers too? i Thought the cylinders who lower the legs worked as shock absorbers. No, the legs lock once the pneumatics have extended them. This is because the pneumatics have only just enough pressure to extend the legs and no more (because high-pressure pneumatics are too heavy), so they don't have the force to keep them extended during touchdown. It was failure of one of the leg-locks which caused one booster to fall over after landing. I am sure somebody will remind me which one! Quote Link to comment Share on other sites More sharing options...
StrandedonEarth Posted June 24, 2017 Share Posted June 24, 2017 2 hours ago, softweir said: It was failure of one of the leg-locks which caused one booster to fall over after landing. I am sure somebody will remind me which one! I don't remember what the mission name was, but it was the first landing attempt off Vandenberg and morning mist/fog caused the locking collett to ice up Quote Link to comment Share on other sites More sharing options...
magnemoe Posted June 24, 2017 Share Posted June 24, 2017 2 hours ago, softweir said: No, the legs lock once the pneumatics have extended them. This is because the pneumatics have only just enough pressure to extend the legs and no more (because high-pressure pneumatics are too heavy), so they don't have the force to keep them extended during touchdown. It was failure of one of the leg-locks which caused one booster to fall over after landing. I am sure somebody will remind me which one! You don't need high pressure pneumatic, or rater the landing creates the pressure,this assuming the entire down movement is pneumatic and not gravity for the last part. Quote Link to comment Share on other sites More sharing options...
Grand Ship Builder Posted June 24, 2017 Share Posted June 24, 2017 I watched the Friday launch of BulgariaSat-1. It was amazing too, and it was the first time a booster has landed on both the east and west coast drone ships (Just read the instructions and Of course I still love you) Quote Link to comment Share on other sites More sharing options...
magnemoe Posted June 24, 2017 Share Posted June 24, 2017 1 hour ago, WildLynx said: You need high pressure in pneumatic shock absorber to make it work. Or else it will collapse all the way under weight of single Lynx. Air is easily compressed... You are correct, I was thinking hydraulic. pneumatic would not work unless high pressue, and yes using the huge cylinders for pneumatic would be way to heavy while pneumatic would work well for lowering them. Quote Link to comment Share on other sites More sharing options...
Brotoro Posted June 24, 2017 Share Posted June 24, 2017 I really want to see video of the landing taken from the barge. Quote Link to comment Share on other sites More sharing options...
StupidAndy Posted June 24, 2017 Share Posted June 24, 2017 2 hours ago, StrandedonEarth said: I don't remember what the mission name was, but it was the first landing attempt off Vandenberg and morning mist/fog caused the locking collett to ice up Jason-3 Quote Link to comment Share on other sites More sharing options...
CatastrophicFailure Posted June 24, 2017 Share Posted June 24, 2017 (edited) Meanwhile, in California... Edited June 24, 2017 by CatastrophicFailure Kerm flarping dangit... Quote Link to comment Share on other sites More sharing options...
sojourner Posted June 25, 2017 Share Posted June 25, 2017 4 hours ago, CatastrophicFailure said: Meanwhile, in California... Those are the new titanium grid fins. Quote Link to comment Share on other sites More sharing options...
CatastrophicFailure Posted June 25, 2017 Share Posted June 25, 2017 12 minutes ago, sojourner said: Those are the new titanium grid fins. They are? How can you tell? This isn't a full Block 5, is it? Quote Link to comment Share on other sites More sharing options...
tater Posted June 25, 2017 Share Posted June 25, 2017 Quote Link to comment Share on other sites More sharing options...
Spaceception Posted June 25, 2017 Share Posted June 25, 2017 (edited) What time for the launch? Can't seem to find anything on that Edited June 25, 2017 by Spaceception Quote Link to comment Share on other sites More sharing options...
StupidAndy Posted June 25, 2017 Share Posted June 25, 2017 8 minutes ago, Spaceception said: What time for the launch? Can't seem to find anything on that Wikipedia has an accurate page, just its in UTC https://en.wikipedia.org/wiki/List_of_Falcon_9_and_Falcon_Heavy_launches Quote Link to comment Share on other sites More sharing options...
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