avmich

56 ms·

751.
by avmich 3y ago
Ullage motors have to be solid - this way they don't need ullage themselves to fire - or to be fed from separate tanks - this is another reasonably complex subsystem which needs to be refueled somehow between flights. If ullage motors
752.
by avmich 3y ago
Quite reasonable incremental testing program.
753.
by avmich 3y ago
Apples and oranges. Starship delivers far more to the Moon surface in one flight, which is handy if somebody wants to actually stay on the Moon for prolonged activity. And on a per-kilogram on the Moon surface comparison Starship is quite c
754.
by avmich 3y ago
Could be surprising, but some kids of the day in the Soviet Union were more fearful (well... wrong word...) of Chinese nukes rather than American ones.
755.
by avmich 3y ago
It's possible to avoid creation of the bubbles in the first place though. Some tanks could use pistons, and some - flexible membranes between displacing gas and the liquid fuel. Or tanks could be flexible themselves, squeezing the fuel
756.
by avmich 3y ago
Mathematics is about following the rules, you first define some formal rules, then you study the consequences of such definition. A well-known example: 5th Euclid axiom leads to Euclidean geometry, while a different axiom leads to non-eucli
757.
by avmich 3y ago
According to Wikipedia: https://en.wikipedia.org/wiki/SpaceX_Starship_(spacecraft) Launch mass: 1320 tons (120 tons dry) Payload capacity: 100 - 150t (fully reusable)[1] 250 - 300t (expendable)[2] So, to f
758.
by avmich 3y ago
"Can" doesn't mean you "should", and for such a price it's a doubtful proposition.
759.
by avmich 3y ago
Yeah, I'm disagreeing with some approaches. For example, in real life the engineer usually knows the constraints of the problem, and can add them himself. More, asking clarifying questions regarding memory versus speed will quite often
760.
by avmich 3y ago
Parent: Child, please go wash your hands. Me: Should I wash both hands? Parent: Yes. Me: Should I wash them in any order or the order is important? Parent: In any order. Me: Should I wash them fast or thoroughly? I need to ask as that may a
761.
by avmich 3y ago
We have less workers - but less workers need less products, so it should balance itself somehow, which it probably does, just on a bigger scale. Suppose we automate a lot, and need less workers. In the future we'll either have less peo
762.
by avmich 3y ago
For space nerds, Bradbury wrote this: https://metallicman.com/laoban4site/r-is-for-rocket/ - one of his works, in some sense similar to the anticipation of these months.
763.
by avmich 3y ago
But it's also a huge payload to surface, in one piece. As for proportionality, it's up to Starship Isp - which isn't hydrogen, but rather good in comparison with kerosene (well... some Russian vacuum kerosene engines are quit
764.
by avmich 3y ago
For all the drawbacks of the USA, today it's the best place on Earth to build projects like SpaceX, period. That's the main reason to stay. Notably the founding father of Chinese space industry worked under von Karman in Caltech a
765.
by avmich 3y ago
When George W. Bush announced "return to the Moon" program in the wake of Columbia disaster, some related companies (I remember reading about e.g. Caterpillar) started to figure out plans to participate with activities on the surf
766.
by avmich 3y ago
Maybe not so many. Assuming 1200 tons of fuel for Starship on LEO ( from here - https://en.wikipedia.org/wiki/SpaceX_Starship_(spacecraft) ) and 100-150 tons of payload, it's 8-12 Starship launches to fuel up the
767.
by avmich 3y ago
I'd be more concerned about space radiation. As for cooling, in space you have a lot of space, and each computation unit may get equipped with its own radiator tailored for its heat production, and you may spread datacenters across lar
768.
by avmich 3y ago
My feeling is we're going to have a change similar to what aviation had in 1930-s. Before that we had everything on the ground and sea, and both land and sea transportation were quite developed. The 1930-s, roughly, had a visible birth
769.
by avmich 3y ago
Sounds... strange. > that's not a carte blanche to just waste money that could otherwise be invested in a better way. What are some of the better ways to approach investment by the government today, compared to what we have?
770.
by avmich 3y ago
I wonder how do you know it. There was some discussion in some rocketry forum of possible collisions between tech export and the First Amendment. I think this is still a somewhat open question.
771.
by avmich 3y ago
Yeah, Moon flight trajectories could be somewhat head-scratching. Imagine the Moon orbit is in the plane of the Earth equator (it's not) and you're launching your rocket also to the equatorial plane. Moon rotates around the Earth
772.
by avmich 3y ago
> Landing still requires a lot of fuel, which needs fuel to be carried up. That's true, and that reduces the payload of the returning stage. To have it working, you either have to reduce the payload or to increase the size of the st
773.
by avmich 3y ago
I feel both sides are exaggerating here - "lured with right combination" and "men with guns". Both of these aren't really working like this in our world.
774.
by avmich 3y ago
Every SSTO except Skylon. The video explanation conveniently doesn't talk about what fueling in flight does to numbers.
775.
by avmich 3y ago
"Very much" is out of place here. X-33 had 5 risky technologies to prove, and any failure with them could ground the project. Formally they failed when the composite tank structure broke (the liquid gas evaporated and composite la
776.
by avmich 3y ago
At least the landing mode of the Dream Chaser is different and allows landing on a runway, not to a Mechazilla installation.
777.
by avmich 3y ago
A friend graduated from a world top university and had strong 20-30 years career in software, getting to senior architect level in several companies, with tenures of about 5 years in a company. Moved to Toronto last December and still can&#
778.
by avmich 3y ago
It's true that immediate problems with AI are different, but we hope to be able to solve those problems and to have time for that. The risks addressed in the article could leave us less time and ability to properly solve when they grow
779.
by avmich 3y ago
> Education being compulsory for students who don’t want it is an extreme social mistake and one we should remedy as soon as possible. I disagree. Children often don't see the value of education - partially because it's not sho
780.
by avmich 3y ago
It wasn't mentioned in the comment itself. And of course 100-year timeframe behavior can hint at much shorter timeframe behavior, which is quite relevant.

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