Indian startup 3D prints rocket engine in 72 hours • Hacker News Board

Re: Indian startup 3D prints rocket engine in 72 hours

#101

Post by panick21_ » Thu, Jun 13, 2024, 3:07 PM UTC

nordsieck wrote: post #13

fallingknife wrote: post #10

Earlier quoted context omitted.

> America's immigration system gets more and more rickety It's completely insane that we allow mass migration of people with no money and no skills and make it incredibly difficult for the most valuable immigrants to get in.

> It's completely insane It makes perfect sense when you understand the principal-agent problem and the current political landscape. https://en.wikipedia.org/wiki/Principal%E2%80%93agent_proble...

If the policy was the opposite you could also argue that. Its basically a fundamental problem of government, whatever the outcome.

You have to be way more specific when you want to actually be insightful about the topic.

Re: Indian startup 3D prints rocket engine in 72 hours

#102

Post by 1024core » Thu, Jun 13, 2024, 3:08 PM UTC

krisoft wrote: post #87

constantcrying wrote: post #63

>Constructing a rocket engine using conventional approaches can take months, followed by extensive qualification testing to ensure it meets the required specifications. Using a metal 3D printer from German company EOS, Agnikul produced its engine in roughly three days. Agnikul printed the engine out of inconel, a high-performance alloy of nickel and chromium that can withstand high temperatures and mechanical loads.…

> Besides, the question I have is why 3D printing? Rocket nozzles are heat limited. You could get more trust out of them only if the nozzle would not melt. So you do a lot of tricks to cool it. One of those many tricks is that you circulate your rocket fuel as a coolant in the wall of the nozzle. This requires an intricate web of many tiny pipes which form the wall of the nozzle. Typically these are constructed by ha…

> I'm not sure what is your objection.

I am. It is that it's an Indian company. How dare these brown people do something cutting-edge in science or engineering!

Re: Indian startup 3D prints rocket engine in 72 hours

#103

Post by 1024core » Thu, Jun 13, 2024, 3:10 PM UTC

shrubble wrote: post #47

I wish them well, but the rocket went less than 9km to apogee and 8km over the ground. It has to continue improving...

Wright Brothers first airplane flew only 100m or so.

Re: Indian startup 3D prints rocket engine in 72 hours

#104

Post by 1024core » Thu, Jun 13, 2024, 3:11 PM UTC

29athrowaway wrote: post #89

I hope this doesn't lead to an exponential increase in space debris.

[dead]

Re: Indian startup 3D prints rocket engine in 72 hours

#105

Post by troyvit » Thu, Jun 13, 2024, 3:12 PM UTC

teitoklien wrote: post #46

pjc50 wrote: post #38

Earlier quoted context omitted.

Like the War On Drugs, the human cost, violence, and intrusiveness of enforcement is worse than the alleged problem. The much-vaunted localism of America lets states and cities decide that it's not a problem for them to allow people to live there, and they don't want to help the big bad Federal government disrupt that. (it's still no picnic being in that category, unable to register for social security or even take a…

World isnt some amazing la la land, I hope people who break laws to immigrate to America, will continue having the same sympathies towards you, when they become majority, and start dominating over you with their culture. It feels bad to say this, but to build a good well integrated state, integration is key, you cannot integrate people into a society, if you cannot even control the immigration rate. You can't just le…

> I hope people who break laws to immigrate to America, will continue having the same sympathies towards you, when they become majority, and start dominating over you with their culture.

I don't know how many folks around me broke the law to immigrate to America, but whether or not they broke the law to come here they faced a lot of racism, classism, and suspicion. I've been in the same area for about 20 years, and if I'm not a minority in my neighborhood it's close. It's the immigrants who are kind to me, help me keep my house secure, and trade goods and services with me. They even help me practice my awful Spanish with them. So in my case, yeah it's working out.

> America isnt a country, with limitless resources, and enough food,housing,healthcare to feed everybody, stop treating it like it.

America doesn't have limitless resources, but with 5% of the world's population it uses 25% of the world's resources [1]. To anybody's eyes that's going to look limitless.

I think simple laws of diffusion say that people are going to go where the resources are available. Whether it's politically tenable doesn't matter, this is human nature since we started walking.

[1] https://www.re-sources.org/2020/05/online-lesson-material-wo...

Re: Indian startup 3D prints rocket engine in 72 hours

#106

Post by hindsightbias » Thu, Jun 13, 2024, 3:14 PM UTC

fallingknife wrote: post #10

alephnerd wrote: post #5

> feature eight engines in total and able to carry a 300-kilogram payload to an altitude of around 700 km. The launch vehicle used in May’s test was only 6 meters tall Significant military implications as well [0]. There is a significant spy-sat race going on in the region right now [1] with China, India, UAE, Saudi Arabia, US, Japan, South Korea, North Korea, Russia, Iran, Israel, etc all investing in capabilities i…

> America's immigration system gets more and more rickety It's completely insane that we allow mass migration of people with no money and no skills and make it incredibly difficult for the most valuable immigrants to get in.

valuable immigrants are going to take my jerb and not flip my hamburger, pick the crops or mow my lawn.

Re: Indian startup 3D prints rocket engine in 72 hours

#107

Post by ETH_start » Thu, Jun 13, 2024, 3:15 PM UTC

rvnx wrote: post #73

raverbashing wrote: post #64

Earlier quoted context omitted.

Well there were probably some early warning signs The problem is that warning sign comes at around 10ms or less before the actual disaster

If it would be a Tesla, just enough time for the auto-pilot to disengage and claim it was the fault of the user.

Tesla autopilot is not supposed to be unmonitored, so any accidents under its control are entirely the fault of the driver. If a driver disengaged 0.1s before impact, they were derelict in their driving.

Re: Indian startup 3D prints rocket engine in 72 hours

#108

Post by aamoyg » Thu, Jun 13, 2024, 3:17 PM UTC

ssivark wrote: post #32

aamoyg wrote: post #21

Earlier quoted context omitted.

It takes them 40 years to make a contemporary fighter jet, not all of which is in house, and they cannot make an infantry rifle, tank, or any defense equipment that their DoD equivalent is happy with outside of "ring laser gyroscopes", which was developed as a part of their guided missile program, which was made with covert and overt Russian and possibly Iraqi help. They cannot make their own trainsets, cars, and con…

> No country without a basic civic sense can (in the immediate few years) have the R&D capabilities you speak of in a meaningful fashion. LOL. Pray tell… Are you going to elaborate on your theory of technology development, or are you just bloviating your biases?

And sure, I am biased. That was my dad's life. That was his story. He made the call to leave India hoping to improve his career by moving to Australia and then the United States. He considered moving back multiple times, but could not bring himself to do so, not because of the lack of good opportunities, but because of the lack of civic sense.

There are people in India who work super hard (which he really likes), but then there are people who are so selfish, driving on the sidewalk in the opposite direction, get upset because the ambulance is speeding to the hospital and refuse to move and block it intentionally, taking all kinds of shortcuts and opportunities to cheat each other instead of conducting business honestly, etc. No good treatment of women.

It's messy and it needs to get more organized to do anything meaningful in terms of R&D in that country.

Re: Indian startup 3D prints rocket engine in 72 hours

#109

Post by aamoyg » Thu, Jun 13, 2024, 3:20 PM UTC

aamoyg wrote: post #83

triceratops wrote: post #66

Earlier quoted context omitted.

> Most of Japanese innovation is actually from US companies that they took over. Just gonna leave this here: https://en.wikipedia.org/wiki/List_of_Japanese_inventions_an... Hopefully you'll realize that that is one of the more uninformed takes you've had, and then question the other things you think are true.

I clicked on that list. I went to pocket calculator, and it said the first one was made in the United States.

You should look into the sheer amount of industrial espionage that Japan did in the United States and Soviet Union post WW2. It is mind boggling. We started legally transferring and licensing technology to them so that at least we would make some money back.

Re: Indian startup 3D prints rocket engine in 72 hours

#110

Post by elteto » Thu, Jun 13, 2024, 3:20 PM UTC

constantcrying wrote: post #63

>Constructing a rocket engine using conventional approaches can take months, followed by extensive qualification testing to ensure it meets the required specifications. Using a metal 3D printer from German company EOS, Agnikul produced its engine in roughly three days. Agnikul printed the engine out of inconel, a high-performance alloy of nickel and chromium that can withstand high temperatures and mechanical loads.…

SpaceX has been printing the Draco and Super Draco engines for the Dragon capsule for many years. It’s a proven technology at this point.

With 3D printing you can create geometries that are simply not possible with any other manufacturing processes.

The issue is not 3D printing. The issue is deluding yourself by thinking that somehow 3D printing is magical and you get to skip qual. You don’t.