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Can we fix it? Yes, we can 🔧

Astronauts Josh Cassada and Frank Rubio have successfully installed Roll-Out Solar Array on the starboard truss structure of the @Space_Station. They have also disconnected a cable allowing restoring a power channel to 75% of its operating capacity.
The original problem:After a vertical emergency water landing,  a Starship may not survive a topple to a horizontal floating position.
Proposed solution: land vertically and stay vertical using RCS and/or reaction wheel while sinking vertically to a "spar buoy" position by flooding the LOX tank. Starship will not topple at all: it will float vertically.
Objection: inrushing seawater will freeze when it hits the LOX, blocking the valve
Solution: use large blowout panels at the base instead of simple valves to allow dump of residual LOX and seawater ingress.

There is a video demonstration of F9 surviving a topple, even though it was not designed for it.

Look and see if first order equations prohibit survival from a topple.  They don't.   It looks pretty reasonable in fact.  Which is why that F9 survived despite there being zero design intent and in general having a much weaker construction and pressurization than a Starship.

Next step is to try and see if toppling will destroy (meaning explode) a Starship IRL.  Hopefully we get to find this out within the next month or two.

Then keep repeating IRL.  I suspect we'll see a couple of repeats of water landings.

The chain of causation I see you citing for why you are doing the design sets off every system design engineer alarm bell my brain has.   The alarm bell connected to "best part is no part".
I happen to agree with you, and I think the topple is likely to just work. I was looking for the simplest alternative if the topple does not work, since there are several posts here that raise this concern. Upthread you will see that I also think there is a trajectory that brings Starship in to zero velocity at water level but already at an angle, so the topple does not start at vertical. This is also a "best part is no part" improvement.
ISS Section / Re: Expedition 68 Thread
« Last post by FutureSpaceTourist on Today at 07:42 pm »

NASA astronauts Josh Cassada and Frank Rubio successfully completed today's EVA to install an ISS roll-out solar array (iROSA), as well as work a separate power channel issue.

@ChrisG_NSF spoke to Boeing about lessons learned from the first iROSAs:
From that ^^^ video, we see what appear to be blast deflectors being installed on the top edge of the tank farm berm.
There's another peek at it in the latest video, but not much.  Photographers!  Are you allergic to the berm construction?  ;)

Anyway, it looks like they're going to pour an upright wall extension on the top of the berm.  Can't tell if that's tied rebar or fencing.
Quoting myself to continue.  Just watched the RGV weekly video, and they have a good photo.  Here's a screenshot.  It's tied rebar.  They're building a pretty hefty deflector wall.  Don't know if it will go all the way across the berm, but on this side they're trying to protect the banks of He tanks behind the berm.

Group photo of Shenzhou-14 and Shenzhou-15 crews..
Taken before Shenzhou 14 launch...
So Fei, Deng and Zhang were the backups of Shenzhou 14
Suborbital Missions / Re: The suborbital thread!
« Last post by russianhalo117 on Today at 07:18 pm »
I think this is worth sharing here.
Raytheon and MBDA are planning to jointly manufacture Patriot PAC-2 GEM-T missiles in germany. Euro-SD
This is additional production capability on top of the USA production. The missile motors are planned to be manufactured by Bayern Chemie. MBDA

This relates to suborbital spaceflight by the fact that PAC-2 motors at end of life are turned into Malemute rocket motors. Bayern Chemie also is developing the Red Kite for DLR (MoRaBa). So Bayern Chemie might turn into the main rocket motor provider for European suborbital rockets.

I messed around a bit with paint on the DLR MoRaBa launcher graphic.
I've added the smaller TME rockets and some hybrid and liquid suborbital rockets that are in development in Europe.

PS: Esrance Space Center updated their launching program.
Rheinmetall Defence is involved in developing the launch system for the listed Patriot PAC-2 GEM-T missile system.
But do you have an argument for such an opinion? A neuron is just a physical object that obeys physical laws. The Church-Turing thesis suggests that a computer program should be able to emulate the function of a neuron. While emulating a hundred billion neurons with a thousand trillion interconnections is challenging there is no new physics here as far as we can tell. Therefore it seems to be mostly an engineering problem.

The transistor was invented in 1947. It was around the size of a matchbox. In the span of one lifetime we have learned how to put over five billion of them on a little chip of silicone. Before 1947 such a thing would have consumed a large fraction of the electrical output of the entire US and the waste heat would have torched an entire city. I have a dozen of these things operating in my house now. I see no reason that A.I. cannot proceed similarly. A.I. will be embedded in just about every piece of technology we produce. Asking how it can be used in space is like asking how transistors can be used in space.
I'm not arguing that intelligence is supernatural--just that we don't have the foggiest idea how to engineer such a thing. Nor is it reasonable to suppose that if we just make our computing systems bigger they'll somehow magically become intelligent. I hope you don't think Starship will become intelligent just because it's bigger than Falcon 9! :-)

I think this is a really popular belief among people with vague ideas of how computers work and no idea at all of how artificial intelligence works. Trust me on this--lack of computing power is not what stops current (or foreseeable) AI technology from having human-level intelligence. It's easy to say it's an engineering problem, but it's a problem where it's clear that something critical is missing from our current systems, and we have no idea what that is. That's why I like to make analogy with the ancient Babylonians trying to reach the moon by building higher and higher towers, not realizing that they didn't know enough about the problem to make even a start at it.

Over the rest of the century, AI will make a lot of contributions to society in general and to space travel in specific, but that will be real AI, not some fantasy AI that approximates human intelligence.
ISS Section / Re: Expedition 68 Thread
« Last post by Rondaz on Today at 07:00 pm »
[email protected]_Astronauts Josh Cassada and Frank Rubio ended their spacewalk at 2:21pm ET today after successfully installing a new roll-out solar array on the station.
ISS Section / Re: Expedition 68 Thread
« Last post by Rondaz on Today at 06:59 pm »
Spacewalkers Complete New Solar Array Installation on Station

Mark Garcia Posted on December 3, 2022

Expedition 68 Flight Engineers Josh Cassada and Frank Rubio of NASA concluded their spacewalk at 2:21 p.m. EST after 7 hours and 5 minutes.

Cassada and Rubio completed their major objectives for today to install an International Space Station Roll-Out Solar Array (iROSA) and disconnect a cable to ensure the 1B channel can be reactivated. They also completed an additional task to release several bolts for the upcoming iROSA installation on the 4A power channel on the port truss.

It was the 256th spacewalk in support of space station assembly, upgrades and maintenance, and was the second spacewalk for both astronauts. Cassada and Rubio are in the midst of a planned six-month science mission living and working aboard the microgravity laboratory to advance scientific knowledge and demonstrate new technologies for future human and robotic exploration missions, including lunar missions through NASAís Artemis program.

The next U.S. spacewalk is scheduled for Monday, Dec. 19, to install an iROSA on the 4A power channel on the port truss. This will be the fourth iROSAs out of a total six planned for installation. The iROSAs will increase power generation capability by up to 30%, increasing the stationís total available power from 160 kilowatts to up to 215 kilowatts.
 What things looked like a few minutes ago while I was waiting for a giant roll of Lifesavers to clear the road.
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