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How to start a rocket engine

everydayastronaut.com

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Re: How to start a rocket engine

#131

Post by lostlogin »

LargeTomato wrote: post #49
samwillis wrote: post #3

Earlier quoted context omitted.

> His interviews with Musk are a treasure trove as well, whatever you think of Musk. My main take away from those interviews is just how knowledgable Tim is, he's able to engage in low level and in depth conversations about how these engines work. It's not just superficial high level knowledge from making videos, he is thinking himself how to optimise and improve these things, and leading that conversation. The passi…

To be honest he's regurgitating a lot of information. He has large gaps in his knowledge but presents himself as extremely knowledgeable. Understanding a rocket engine as a layman is easier than understanding a diesel engine. EDA acts like he's a genius but he is not. I work in space. Some of my coworkers have met EDA. He is insufferable and extremely arrogant. A very difficult person to be around.

Can you clarify, do you ‘work in this space’, or ‘work in space’? Both work and it’s interesting.

Re: How to start a rocket engine

#132

Post by ace2358 »

MichaelZuo wrote: post #120
ace2358 wrote: post #108

Earlier quoted context omitted.

It’s pretty rough because those ‘you’re wrong’ videos are actually just as wrong as he was. The main issue is that these complicated topics are difficult to describe properly is a 20 min English video that has to be edited to be interesting. How electricity propagates is really complicated topic involving 3D vector calculus, for the EM waves. Most people don’t do electronic circuits by evaluating the vector field, th…

Can you link to a 100% correct explanation? Can be in any format.

Sorry but no. Our ‘models’ of the universe will never be 100% correct.

If you’d like a 100% ‘correct’ explanation of the maxwells ‘laws’ of electrodynamics I refer to a sibling comment regarding the Feynman lectures. lectures.

Re: How to start a rocket engine

#133

Post by Steve44 »

sbradford26 wrote: post #19
EvanAnderson wrote: post #13

Earlier quoted context omitted.

All the imperial units in this PDF hurt my head. I'm an American, so I'm used to them, but seeing them in the context of precision aerospace hardware is so jarring. As a student it seemed like math re: chemistry and physics was so much easier (read: less error-prone) with metric units than with imperial. Mars Climate Orbiter indeed.

The biggest lessons learned on the Mars Climate Orbiter wasn't exactly that everything should be metric. It was the unit conversion is dangerous and needs to be handled very carefully. Just saying everything will be metric doesn't avoid unit conversion. You might have one thing measuring fuel burn rate in grams/second and another in kg/second. That conversion can still lead to issues if not handled correctly. In the…

> You might have one thing measuring fuel burn rate in grams/second and another in kg/second.

One of my jobs is reporting on packaging weights[1] in the UK and it's not uncommon to have this problem when I request data.

For example we request in Kgs, but one manufacturer sent back the report table of numbers in grams. That meant the thin plastic sleeve a tube of paper coffee cups comes in was reported at 30Kgs rather than 30g.

These components are all taxed / levied at various stages in the supply chain so being out by a factor of 1,000 can make a significant difference - we sanity check all our data, but a surprising number of people don't. It's not life threatening, but expensive!

[1] It's for the UK packaging waste regulations and packaging taxes. For a case of paper coffee cups we report on the weight and materials of every component such as the cardboard outer box, labels, parcel tape, inner sleeve bags, paper in the cups and the plastic lining in the cups.

Re: How to start a rocket engine

#134

Post by dotnet00 »

rpmisms wrote: post #57
LargeTomato wrote: post #50

I'm surprised at the amount of people who enjoy EDA. I find him very irritating. Most people at my small space company find him extremely irritating. He is not a rocket scientist. He parrots silly buzzwords like "biomimickry" like a fanboy, not an engineer. He suggests things to Elon for how to do rockets that are just pants-on-head dumb. His blind fanboyism and arrogance irritate so many people who work in space. I'…

He's incredibly annoying, but he knows his shit. He's like a crypto influencer who also happens to be a brilliant engineer. I watch his content because it's insanely informative, even though he reminds me of every con artist I've ever met.

That's a perfect description of the feeling I get when watching him. Something just feels slightly off enough that I fully expect some skeletons to come out of his closet at some point like with the vast majority of crypto influencers.

Re: How to start a rocket engine

#135

Post by LawTalkingGuy »

LargeTomato wrote: post #66
peterfirefly wrote: post #60

Earlier quoted context omitted.

> He has large gaps in his knowledge Yes. > but presents himself as extremely knowledgeable. No.

Yeah he has an extreme level of confidence. Tweeting Elon about how to architect the landing fins to use "fish scale biomimickry"? That's ridiculous.

He didn't. He tweeted that he's surprised the tiles don't need to be overlapped to avoid blowing off but didn't suggest that Elon change them.

https://mobile.twitter.com/Erdayastronaut/status/14426315302...

Re: How to start a rocket engine

#136

Post by rpmisms »

dotnet00 wrote: post #134
rpmisms wrote: post #57

Earlier quoted context omitted.

He's incredibly annoying, but he knows his shit. He's like a crypto influencer who also happens to be a brilliant engineer. I watch his content because it's insanely informative, even though he reminds me of every con artist I've ever met.

That's a perfect description of the feeling I get when watching him. Something just feels slightly off enough that I fully expect some skeletons to come out of his closet at some point like with the vast majority of crypto influencers.

I mean, he's a divorced young guy, so the "fake" aspect probably comes from some pent-up trauma and hiding it. Could explain a lot of the vibe.
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