tater Posted August 24, 2017 Share Posted August 24, 2017 9 minutes ago, Mitchz95 said: Static fire has moved to August 31st. Wasn't Sept 1 the day AMOS-6 was lost? Maybe that's why they moved it. Quote Link to comment Share on other sites More sharing options...
CatastrophicFailure Posted August 24, 2017 Share Posted August 24, 2017 . . . aaaand somebody cue up Ain't Superstitious. Quote Link to comment Share on other sites More sharing options...
tater Posted August 25, 2017 Share Posted August 25, 2017 In answering a tweet about ITS landing on a mount (no legs), he said that the tolerance would probably be about 2m. Quote Link to comment Share on other sites More sharing options...
cubinator Posted August 25, 2017 Share Posted August 25, 2017 As Falcon 9 reenters Earth's atmosphere, doesn't it experience a sort of second Max-Q? At what altitude and speed are the forces the greatest during descent? Quote Link to comment Share on other sites More sharing options...
Nightfury Posted August 25, 2017 Share Posted August 25, 2017 (edited) 9 minutes ago, cubinator said: As Falcon 9 reenters Earth's atmosphere, doesn't it experience a sort of second Max-Q? At what altitude and speed are the forces the greatest during descent? For FORMOSAT-5 i looked quickly. At an altitude of 25,1km the first stage was at 3235km/h, after that point it only decelerates. So there would need to be the highest forces i think (If my english is too bad, I'm sorry. In Germany I usually don't speak english) Edited August 25, 2017 by Nightfury Quote Link to comment Share on other sites More sharing options...
wumpus Posted August 25, 2017 Share Posted August 25, 2017 1 hour ago, tater said: In answering a tweet about ITS landing on a mount (no legs), he said that the tolerance would probably be about 2m. Interesting, that's the first I've seen official information on booster separation velocity (although you can slow-mo through the video and get the data in km/h). Expect much scarier velocities on Falcon Heavy (success of the mission wouldn't be nearly the surprise that spacex is warning people of, landing the center stage is far beyond any landing they've pulled off (because the upper stage needs so much more of a push, and the center stage is the only thing that can push it). Quote Link to comment Share on other sites More sharing options...
tater Posted August 25, 2017 Share Posted August 25, 2017 He also said the highest velocity booster on return that was recovered was Bulgariasat at 7.9 Mach---the one we don't get to see the landing video of (dang it!). Quote Link to comment Share on other sites More sharing options...
Elthy Posted August 25, 2017 Share Posted August 25, 2017 2 hours ago, Nightfury said: For FORMOSAT-5 i looked quickly. At an altitude of 25,1km the first stage was at 3235km/h, after that point it only decelerates. So there would need to be the highest forces i think (If my english is too bad, I'm sorry. In Germany I usually don't speak english) At that point you only have 1g of "deceleration" from aerodynamics, it gets way worse in the flight. One way to find out would be to go frame per frame throught the video and look for the biggest change in velocity. Quote Link to comment Share on other sites More sharing options...
Nightfury Posted August 25, 2017 Share Posted August 25, 2017 10 minutes ago, Elthy said: At that point you only have 1g of "deceleration" from aerodynamics, it gets way worse in the flight. One way to find out would be to go frame per frame throught the video and look for the biggest change in velocity. Ouh, right...could have know this from my landings in KSP (The air is getting thicker and thicker, which causes more drag) Quote Link to comment Share on other sites More sharing options...
tater Posted August 25, 2017 Share Posted August 25, 2017 Quote Link to comment Share on other sites More sharing options...
Cunjo Carl Posted August 26, 2017 Share Posted August 26, 2017 Sorry if it's common knowledge, but have there been any updates on the Raptor engine since its scale test last year? Quote Link to comment Share on other sites More sharing options...
Ultimate Steve Posted August 26, 2017 Share Posted August 26, 2017 30 minutes ago, Cunjo Carl said: Sorry if it's common knowledge, but have there been any updates on the Raptor engine since its scale test last year? Composite of two images (the second one only for reference). That, as far as we know is the test stand for "Baby Raptor" at McGregor. As you can see, it packs quite a punch judging by those grass burn marks... Quote Link to comment Share on other sites More sharing options...
Cunjo Carl Posted August 26, 2017 Share Posted August 26, 2017 1 minute ago, Ultimate Steve said: Composite of two images (the second one only for reference). That, as far as we know is the test stand for "Baby Raptor" at McGregor. As you can see, it packs quite a punch judging by those grass burn marks... That's.... SO COOL!! I need one for my weeds. Quote Link to comment Share on other sites More sharing options...
CatastrophicFailure Posted August 26, 2017 Share Posted August 26, 2017 1 hour ago, Ultimate Steve said: As you can see, it packs quite a punch judging by those grass burn marks... The local fire department must love them. Quote Link to comment Share on other sites More sharing options...
KSK Posted August 26, 2017 Share Posted August 26, 2017 2 hours ago, Cunjo Carl said: That's.... SO COOL!! I need one for my weeds. Heh - you beat me to it. "Well - that'll keep the weeds down' is the first thing I thought too. Quote Link to comment Share on other sites More sharing options...
RCgothic Posted August 26, 2017 Share Posted August 26, 2017 On 24/08/2017 at 8:26 PM, tater said: As long as the difference is there, that's all that matters, so you could over pressurize the suit as well, and not bother with a vac chamber. Static fire in 8 days: I mean there may be volatility issues with sealants or materials or such that you'd only discover in a true vacuum test. For pressure vessel integrity I completely agree that 3bar should be good enough. Quote Link to comment Share on other sites More sharing options...
wumpus Posted August 26, 2017 Share Posted August 26, 2017 9 hours ago, Ultimate Steve said: Composite of two images (the second one only for reference). That, as far as we know is the test stand for "Baby Raptor" at McGregor. As you can see, it packs quite a punch judging by those grass burn marks... Yikes. Just how often is central Texas under a burn ban, or does Texas simply not dare violate a property owner's right to create wildfires? Maybe the brush is thin enough that those roads are enough of a firebreak, but I suspect that central Texas wind can move sparks a good long way. Maybe the Californians running spacex know a lot more about wildfires than me (I'm on the East Coast, they're unheard of here) and understand why it isn't a problem (or at least wasn't when the fire in the picture happened). Quote Link to comment Share on other sites More sharing options...
CatastrophicFailure Posted August 26, 2017 Share Posted August 26, 2017 @wumpus Joking aside, SpaceX probably has their own fire crews for this very thing, and keeps them on ready standby during a test. That, and keeping the brush trimmed short like it is makes sure any fires that start don't get out of control. Quote Link to comment Share on other sites More sharing options...
Racescort666 Posted August 26, 2017 Share Posted August 26, 2017 Anyone else have any information/speculation on the readiness of SLC-40? OTV-5 is listed as launching from LC-39A on SpaceflightNow and this appears to be the last Florida launch from that pad until Falcon Heavy. Also, is it too early to start the OTV-5 hypetrain? Quote Link to comment Share on other sites More sharing options...
CatastrophicFailure Posted August 26, 2017 Share Posted August 26, 2017 8 minutes ago, Racescort666 said: Also, is it too early to start the OTV-5 hypetrain? Only if you want them to show up. There is no hypetrain. There is no OTV. You saw nothing. Swamp gas refracted the light from Venus and... Quote Link to comment Share on other sites More sharing options...
Grand Ship Builder Posted August 26, 2017 Share Posted August 26, 2017 (edited) On 8/25/2017 at 9:33 AM, cubinator said: As Falcon 9 reenters Earth's atmosphere, doesn't it experience a sort of second Max-Q? At what altitude and speed are the forces the greatest during descent? That's partly the reason for an entry burn; to slow the craft down enough so Max Q isn't much of a problem. Edited August 26, 2017 by Grand Ship Builder Quote Link to comment Share on other sites More sharing options...
cubinator Posted August 26, 2017 Share Posted August 26, 2017 4 minutes ago, Grand Ship Builder said: That's partly the reason for a boostback burn; to slow down the craft so Max Q isn't much of a problem. I understand. But I wonder if that point occurs during or after the entry burn. Quote Link to comment Share on other sites More sharing options...
Grand Ship Builder Posted August 26, 2017 Share Posted August 26, 2017 5 minutes ago, cubinator said: I understand. But I wonder if that point occurs during or after the entry burn. Mistaken boostback for entry burn. Quote Link to comment Share on other sites More sharing options...
Racescort666 Posted August 26, 2017 Share Posted August 26, 2017 2 hours ago, CatastrophicFailure said: Only if you want them to show up. There is no hypetrain. There is no OTV. You saw nothing. Swamp gas refracted the light from Venus and... I love this forum. Quote Link to comment Share on other sites More sharing options...
tater Posted August 28, 2017 Share Posted August 28, 2017 Quote Link to comment Share on other sites More sharing options...
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