Rockdoc said:
When is the flight scheduled for?
double aught said:
So if these next ones land, do they plan to use them again?
What makes you think that?Ag_of_08 said:
Wondering if they may take off lighter with this one and not run all three engines as long.
nortex97 said:What makes you think that?Ag_of_08 said:
Wondering if they may take off lighter with this one and not run all three engines as long.
One challenge I think they have is that they are only putting 3 engines on it, of course, and with this (unlike for instance the 'star hopper') they can't easily just put dead ballast weight amidship to simulate anything realistic as far as the gymnastics at the end goes (putting it in what will become the cargo bay would be...problematic), so more fuel vs. less makes sense (plus the timing on the hover slam cutoff isn't quite as thin, since the T:W ratio isn't so crazy high).
If more dead weight engines were being used I could see loading it with less fuel but I assume the 'heavier/closer to full' fuel was partly to make the descent closer to real total mass in the future (including more raptors/gear etc.) More fuel also makes the 'sloshing' less of an issue.
The primary difference for SN9 vs. 8 is the 401 stainless steel, I believe.
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Instead, Musk says that SpaceX might be able to quite literally catch Super Heavy in mid-air, grabbing the booster before it can touch the ground by somehow slotting an elaborate "launch tower arm" underneath its steel grid fins. Although such a solution sounds about as complex and risky as it gets, it would technically preclude the need for any and all booster recovery infrastructure even including the legs Super Heavy would otherwise need.
While true, catching Super Heavy by its grid fins would likely demand that control surfaces and the structures they attach to be substantially overbuilt especially if Musk means that the crane arm mechanism would be able to catch anywhere along the deployed fins' 7m (23 ft) length. Even more importantly, it seems extraordinarily unlikely that such a complex and unproven recovery method could be made to work reliably on the first one or several tries, implying that early boosters will still need some kind of rudimentary landing legs.
In other words, much like direct-to-launch-mount landings, mid-air-crane-catch recovery is probably not a feature expected to debut on Super Heavy v1.0.
They land it where it launched from.double aught said:
What's a direct-to-launch-mount landing?
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On average, Atlantic Ocean booster recoveries necessitate around 5-7 days at sea from port departure to port return, meaning that SpaceX's pair of East Coast drone ships could theoretically support 4-6 launches per month with zero downtime for maintenance, repairs, or at-sea weather delays. According to CEO Elon Musk, SpaceX wants to launch 48 times in 2021, meaning that the company could find itself operating its rocket recovery fleet near-continuously without the introduction of along-awaited third drone ship.
In January alone, multiple separate launch calendars forecast four SpaceX launches, beginning with Turksat 5A on January 4th, SpaceX's first dedicated Smallsat Program launch (Transporter-1) on January 14th, and one or two ~60-satellite Starlink missions in the second half of the month. To achieve its 48-launch goal, January will have to have four launches and every other month of 2021 will have to reach a similar cadence. SpaceX completed its first four-launch month ever in November 2020.
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In May last year NASA Administrator Jim Bridenstine announced the agency will collaborate with Hollywood action movie actor Tom Cruise to film a movie at the International Space Station (ISS). "NASA is excited to work with Tom Cruise on a film aboard the Space Station! We need popular media to inspire a new generation of engineers and scientists to make NASA's ambitious plans a reality," Bridenstine stated via Twitter "Should be a lot of fun!" the founder of SpaceX Elon Musk said in response. Cruise will launch aboard SpaceX's Crew Dragon spacecraft, that will be launched into orbit atop the company's Falcon 9 rocket.
They're clearing the SN8 debris from the landing pad so I agree the flight is likely going to happen pretty soon, watching for TFRs, I really want to be down there for SN9.PJYoung said:
Static fire possible today for SN9 and flight possibly within a week or so.
SN10 is completely stacked in the high bay. It will be interesting to see if they bring it over to the 2nd pad before SN9 launches. I'm guessing no due to safety concerns of landing but who knows.
That's basically the theory. We don't know the mechanism exactly, but with the super heavy, unlike the Falcon 9, it's thrust to weight can be lower than 1:1 so I guess that's what he wants to go for (or very similar to it). It can't be moving down much at all to be 'caught' as it's a huge mass plus the engine cutoff has to happen about simultaneously.Bondag said:
For the landing, could they put the rocket in a hover then reach out with the arm and catch it?