avmich

24 ms·

421.
by avmich 2y ago
Don't forget SpaceX was the first private company which achieved orbit without external money, and did that for awfully less money than e.g. Air Force thought possible. Give the credit where it's due, as they say.
422.
by avmich 2y ago
> You're just under the mistaken impression that the goal was to go to space cheaply or whatever. You're way off in the wonderland considering the goals and achievements. Just remember who's the actual goal setter is. Don&
423.
by avmich 2y ago
> Fortunately other companies, besides just SpaceX, are building lots of spacecraft. I wouldn't say they do too much though. In USA we have 1) Dragon - an overall good, rather conventional, rather modest in capabilities design. We a
424.
by avmich 2y ago
This day it's usually not a good professional at all if he thinks he's writing something novel.
425.
by avmich 2y ago
> on the Soyuz even the seats themselves are custom molded to each astronaut The seats are standard, but each astronaut has their own mold, taken on Earth, which is put into the seat.
426.
by avmich 2y ago
I'm not saying the video is wrong. I'm saying that often when you have to consider the message, to understand the message, to put it into perspective you need to understand the messenger. If you have one part of information readil
427.
by avmich 2y ago
Reputation matters when the listener decides what to do with the message. Are those the facts, are enough facts fairly represented. Judging a video could be complicated if you don't know - or can reliably estimate - those things, and i
428.
by avmich 2y ago
I do generally agree with such approach - information, not messenger. However there's a concept of reputation which doesn't go away in many cases - and this could be one of them.
429.
by avmich 2y ago
I understand, but to say that Soviet tech was too overestimated is also questionable. You just can't have those firsts, or even close seconds, if you don't actually have a lot of engineering done well. Remember, USA's Explore
430.
by avmich 2y ago
> (like i do when i finally get a real garage :) Cool :) > Additional facet is that Raptor turbopump is full flow and thus runs at very low You write it further yourself, but rocket turbopump turbines aren't running with cold gas
431.
by avmich 2y ago
Right, but at the time to save on mass they used tricks like working with negative safety margin, that is, engines were calculated to serve particular number of seconds and performed slightly outside of elastic deformations... They did move
432.
by avmich 2y ago
> At the time, the Soviet space program technical capabilities were overestimated by almost everyone Correction: Soviet (liquid fuel) rocket engines became world state of the art in 1950-s and mostly remained as such till about 2010. Roc
433.
by avmich 2y ago
Wait till you learn about the power of femtosecond laser pulses...
434.
by avmich 2y ago
> then test firing one from the batch and assuming all engines in the batch were the same as that one. This obviously isn't how things work Curious what approach you'd propose in their place? > The second was, as mentioned,
435.
by avmich 2y ago
> It's hilarious, 2.9 billion social security numbers (US concept) but wait... ... SSN has 9 decimal digits, so there are only 1 billion (or even somewhat less) of valid SSNs in the whole universe...
436.
by avmich 2y ago
The formula for Isp - the important measure of efficiency of the rocket engine - says that the speed with which the engine throws away hot gases grows with the difference of pressures - before nozzle and at the exit of the nozzle. The whole
437.
by avmich 2y ago
That is affected by how much trade particular country does with Russia, but you can look at the source, the Russian manufacturing, and all its limitations, and Russia can't export more than it produces, so if the source is small...
438.
by avmich 2y ago
> When it comes to gross production, China’s share is three times the US’ share Hmm, and also China is four times bigger than US by population. So per capita US is still ahead, interesting...
439.
by avmich 2y ago
> Taiwan, Mexico, Russia, and Brazil now have higher gross output than the UK. It would be interesting to see Russia to have more manufacturing output than the UK...
440.
by avmich 2y ago
I'm curious where do they use mercury in their processes...
441.
by avmich 2y ago
So is there mercury in the water in dangerous (not just above zero) amounts or not? I don't see that in the article. Can we get things straight?
442.
by avmich 2y ago
On one hand, Buran creators explicitly looked into American design while working. On another, important parts in design are completely different. Saving expensive main engines? Not on the orbiter, but on separate rocket, in subsequent plans
443.
by avmich 2y ago
Tethers Unlimited once considered an option of using tethers to move between orbits (using Earth magnetic field and solar cells for energy) and deorbiting debris.
444.
by avmich 2y ago
Unfortunately his high level decisions of late are definitely reduced in quality comparing to what they were earlier.
445.
by avmich 2y ago
I'm afraid you underestimate Moscow space cluster. In '90s, even in '00s their rocket engines - not quite from Moscow, a few kilometers away, from Khimki - remained world class. Realized project from, among others, Korolyov,
446.
by avmich 2y ago
> the rocket design capital of the world Pretty hard to compete with Moscow, don't you think?
447.
by avmich 2y ago
Will it make sense? One of the first things coming to mind is that if we harvest energy outside of Earth and send it towards Earth, the planet will eventually need to dissipate extra energy as heat back to space. Given that we're curre
448.
by avmich 2y ago
> Cheaper drones will enable their proliferation It would probably be better if the world helped to end this war sooner.
449.
by avmich 2y ago
That could be true, but the question was > From what I’ve read, liquid hydrogen isn’t a great option due to the energy required to create it. Where does that energy come from? and to get the cheapest energy, not the cheapest hydrogen, to
450.
by avmich 2y ago
> Commercially available martian soil simulants don’t contain perchlorates. How do you know?

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