Hmm, yes, normally one would consider an object in free fall when gravity is the only force acting on it (or following Einstein, no force is acting on it). This is what led me to my initial reply about the booster hardly (if ever) being in free fall during its flight.

But your point was about the relevance of gravity on the settling of the debris in the LOX tank in which case one can ignore most forces on the booster and still observe it as free falling.

The why is not easy to wrap my head around, so I understand why Zack and his team made the mistake, but I do get that it is the case. Thanks again!

I had a feeling I was stretching into territory where I don’t know enough, thank you for the clarification.

Following that, and I hope you don’t mind me asking instead of following up myself, would I be correct to conclude that the vehicle technically is in free fall while going up? Just about everything to do with spaceflight can be so unintuitive, which is simultaneously what makes it interesting as well as frustrating at times :)

There was a lot to digest, so I might be wrong, but I was under the impression that he was referring to the boost back phase, so not in free fall. I’m not smart enough to figure out if the gravity vector plays any significant role compared to the one from the engines in that situation :) Neither during the landing burn. There is a huge amount of deceleration which would be a vector straight through the booster? There is a slight tilt to the booster most of the way down, but I don’t know if that could make the debris settle unevenly.

In between those burns nothing can settle as you say. If Zac was referring to that phase than that was indeed an oversight.

If that were true, ‘No’ is also an answer. Total Annihilation does not seem like the only option and certainly not an option to use as a lesson. Can’t teach a dead pupil.

No. The Elite is a (much) higher priced controller with extra features compared to the one that comes with the console. Both the Elite and the regular controller are sold in normal versions by many retailers. And both the Elite and the regular controller can be ordered in a custom design via the Design Lab.

You mentioned that your Design Lab controller(s) use regular batteries. That means they are regular controllers with a custom design. One feature of the Elite controller is that it has a built-in rechargeable battery (you can’t use AA’s with it).

People are talking about reliability issues with the Elite controller which is what the OP ordered. The regular controllers like you seem to mention are generally considered to work well.

At least worth it to keep an eye on every once in a while I would say ;) You never know, they might just pull it off.

To me, doing something exciting can be enough of a purpose by itself.

But if pure science is your only focus, Starship is designed to bring a volume of 1000m³ and a mass of over 100tons to just about anywhere in our system for (far) less money than for previous far more limited missions. For the cost of a single SLS launch we could send up Starship 10 ten times in fully expendable configuration (so no reuse at all), carrying a bigger and heavier payload each time. This capability can be proven next month if SpaceX manage to keep control of the ship on orbit. Nobody doubts they can control a spacecraft on orbit. Getting only the booster back, a thing they demonstrate more than twice a week with Falcon to be very capable at, will double it to 20 launches per SLS launch. There is a good chance they will be able to demonstrate that capability with Starship this year. To be fair, to get that volume and mass beyond earth’s orbit, they will need to demonstrate on orbit refueling which is a big hurdle to take.

Webb is a stunning achievement, but could have fit inside Starship with the mirror unfolded (with room to spare for several school busses … it can’t be overstated how ridiculously big that thing is). Imagine how much cheaper it would have been, leaving a huge amount of money on the table for other projects. Or imagine what a successor to Webb might be if designed for the capabilities of Starship. The volume and mass open up possibilities of using off the shelf parts, dramatically lowering cost. Engineers and scientists at NASA and all over the world are absolutely salivating at the possibilities that Starship could unlock. Even before the thing has flown a successful mission, many proposals have been written and I very much doubt that there are no projects already being worked on.

Will it be exciting to see Starship land on Mars? For sure! But what I am even more excited about is what (NASA) scientists will have come up with to stick in the damn thing, a payload volume greater than the internal volume of a Boeing 747.

I don’t find the description of ‘megalomaniac’ for his reasoning behind going to Mars unfair. But I don’t find his reasoning insane either. It is a ‘plan B’ plan of sorts, but on a very, very large timescale. Science says the end of humanity on earth, eventually, is a given. There is a minuscule chance we will be wiped out this century and, with increasing certainty, other opportunities up until the certain end in about half a billion years. That sounds like there is no hurry at all, and there most likely really isn’t. But there is another factor and that is that the progress of science and technology is not a given. History proves that empires fall, not a single one has endured for very long. And with the fall of empires, knowledge has been lost. A lot of it. The chances of that occurring are far greater, very likely even if we look at history, than the complete downfall of humanity. So his reasoning is that now, for the first time in history, humanity has gained the knowledge and ability to leave their own planet. And there is no guarantee at all that we will maintain that capability for long or regain it ever again in the future. So why not aim for it now while we are sure we can?

Is that ridiculous megalomaniac reasoning? Yeah, probably. But it is at least not a simple ‘we’re all going to die, we need a plan B pronto!’. It is mostly ‘why not do this incredibly exciting thing?’ in stead of ‘everyone panic, we have to do this!’.

I don’t care too much about the reasoning. What I like about what SpaceX is doing is that for the first time since Shuttle first flew, finally someone is pushing boundaries in a big way. Space has been coasting, or even regressing in some areas, since the late ‘70’s. It got so far that the US was not even able to send people up at all for 10 years. SpaceX seem to have lit a torch and said ‘let’s change that, let’s set inspiring goals and see how far we can go’. They made space exciting again. I am not the biggest fan of big corporate, but government could not have done the same thing. NASA is amazing, but they are fully dependent on congress for funding and congress does not see exciting projects for humanity, they see a job program for their home states and base their decisions (and thus the agenda of NASA) on that viewpoint. If it requires private enterprise to pick up the torch, so be it. If it requires a controversial person like Musk to make it happen, I’ll take it. For years now every step of the Starship program has made me excited like a child on Christmas morning. The more I learn about it, the more I realise how utterly ridiculous it is, the more excited I am about every step forward. The people at SpaceX who make it all happen have so much talent, knowledge and above all drive and excitement. I can easily look past the clown at the top and cheer with them for all their successes.

If you are really interested there are many channels on YT that cover SpaceX and/or space flight in general. The Everyday Astronaut has amazing deep dives on the technical aspects of space flight which are meant to be very accessible for a general audience. Note that he has interviewed Elon extensively several times and seems to be in good standing with him, so that might put you off. Scott Manly has a very informative channels as well and as far as I know he is not chummy with Elon. For very technical depth you could visit the forums on the website of nasaspaceflight (nothing to do with NASA, they are a groups of space enthusiasts who cover all things space). There is a ton of info and discussion there, but accessible would not be the right term to describe it.

For a bit more bite sized insight I can highly recommend Marcus House on YT. He makes a weekly 20 min video of everything new in space that week. It is surprising how much there is to cover every week.

If you have any interest in engineering and/or space at all, I cannot recommend enough to follow the progress of the Starship program in any way that suits you. The ambitions seem like pure insanity, the thing is so bloody big that every detail and number about it is just ridiculous, yet they are absolutely convinced they can get it to work. And they work on it mostly right out in the open in the middle of bloody Nowhere, Texas, so we get an amount of insight unparalleled in the history of the space industry. So even if you’re out to see them fail, it is still a lot of fun to follow, because they fail a lot and we get to see it all. Next test flight is likely to be next month. They build a full stack in about 6-8 weeks now, including all 39 required engines, so expect several more launches this year and maybe close to one a month next year. These are all test flights where they learn from failures in one flight, come up with solutions and try again in the next flight. Who knows if they will succeed, but it sure is a lot of fun watching them try. Watching 3600 tons of propellant being burned by the most powerful machine humans have ever built (by far) in about 160 seconds is a guarantee for excitement, even if they fail.

You left out a part in that quote, “eventually”. SpaceX have delivered on every NASA contract milestone, most (well) on time even which is unheard of in the space industry. SpaceX have fulfilled their first contract for delivering cargo humans to the ISS and is now on their second contract while Boeing is yet to deliver a single ounce human to the ISS for their first contract that they got before SpaceX got their first. SpaceX delivers, and for a good price as well. SpaceX have never claimed they would make space ‘travel’ 1000x cheaper. Their goal is to make it 1000x times cheaper to lift mass to orbit. Eventually. This is the whole reason for the Starship project. They have made it 5-10x cheaper with Falcon and a working version of the current incarnation of Starship could be 50-100x cheaper. Still a ways to go, but can’t say they aren’t delivering. Nobody else comes close. Which is why SpaceX (the company) will be shooting 90% of all mass to orbit worldwide this year. China (the country) will do about 6%. All other companies and countries together will do the remainder. Why? Mostly because they are by far the cheapest and partly because they are the only ones who can launch so often. Turns out landing a rocket and using it again was a pretty decent idea.

SpaceX have never claimed we would have tourism to Mars soon. Even Elon has not claimed that. At best they would claim it is not outside the realm of possibility within the next few decades.

The accomplishments of SpaceX are undisputed. Which makes it a shame to have such a negative opinion based on so little information in my view. I get a lot of joy from ignoring Elon and focussing on the progress of the company. They do remarkable things. As do others in the space industry and I enjoy following their progress as well.

The how is pretty solid, SpaceX has a very strong track record. The uncertainty is mostly in the when.

It is unfortunate that Elon’s state of mind has become more questionable. But SpaceX is a whole lot more than Elon and they have achieved remarkable things. Just take the Elon presentations with a boat load of salt (mostly concerning the timing) and enjoy the spectacle that SpaceX delivers. It is just ridiculous what they are aiming for and so far they seem to be able to deliver … eventually.

They cut off the engines a couple of seconds before reaching orbital speed for safety. Until they prove they can control the ship on orbit they can’t risk having a 16 floor tall 125 ton steel tower coming down in a random location. This is unrelated to any of Elon’s shenanigans.

There is nobody who knows even the slightest bit about space flight that doubts Starship can reach orbit.

SpaceX has many things to get done to make Starship the fully reusable rocket they want it to be, but picking orbital speed is just about the weakest argument against it.

I am not in a position to judge if this merger will be good for the industry, but this round of layoffs says nothing about that either.

On an individual level it is terrible for the people involved. But on the business level this is a perfectly normal and healthy thing to do and says absolutely nothing about the state of the games industry.

Alleen de eerste is juist.

De tweede zou technisch kunnen als je er een komma tussen zet.

De derde zou technisch kunnen als je er een komma tussen zet, maar bevat dan een dubbele ontkenning en betekent daarmee iets anders dan bedoeld.

Excellent post, thank you for collecting all the information and posting it!

Not the arm, but the QD on the arm was raised some time ago, yes.

Engine design is not stabilising yet, they are still pushing performance. Raptor 3s are now rolling off the line which again have increased performance. They also target a reduction in complexity with each iteration which should in the end increase reliability. But reliability itself is a later target once the design is mostly settled.