Is SpaceX's Raptor engine the king of rocket engines?
Вставка
- Опубліковано 6 чер 2024
- 00:00 - Intro
02:55 - Basic physics of rocket engines
06:10 - Rocket engine cycles
20:30 - Rocket fuel comparison
30:40 - Raptor vs other rocket engines
44:05 - Summary
Article version - everydayastronaut.com/?p=9823...
SpaceX's new raptor engine is a methane fueled full flow staged combustion cycle engine and its so hard to develop, no engine like this has ever flown before!
Now this topic can be really intimidating so in order to bring the Raptor engine into context, we’re going to do an overview of a few common types of rocket engine cycles then compare the Raptor to a few other common rocket engines, like SpaceX’s current work horse, the Merlin, The Space Shuttle’s RS-25, the RD-180, Blue Origin’s BE-4 and the F-1 engine.
And if that’s not enough, not only is SpaceX using a crazy engine cycle, they’re also going to be using Liquid Methane as their fuel, again something that no orbital rocket has ever used! So we’ll also go over the unique characteristics of liquid methane as a rocket fuel and see if we can figure out why SpaceX went with Methane for the Raptor engine.
We'll also break down and explain all the different engine cycle types so you know what the full flow staged combustion cycle is, how it works, and how it compares to the other cycles.
So by the end of this video hopefully we’ll have the context to know why the raptor engine is special, how it compares to other rocket engines, why it’s using methane and hopefully find out if the Raptor engine will be the new king of rocket engines…
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Rocket engine renders by @MartianDays / martiandays
F-1 Turbopump photo provided by Mike Jetzer/heroicrelics.org
HUGE thanks to my Moon Walker Patreon supporters! Blake Jacobs, Eli Burton, Jethro, Mac Malkawi, Neurostream, Ole Mathias Heggem
Want to support what I do? Consider becoming a Patreon supporter for access to exclusive livestreams, our discord channel and subreddit! - / everydayastronaut
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I'm the cohost of an awesome podcast where we talk all about current technologies and how they shape our future! ourludicrousfuture.com or here on UA-cam / ourludicrousfuture - Наука та технологія
There are people that try to stretch a 1min topic into 15min to gain more watch time and then there is cramming a 3 hour lecture on ROCKET SCIENCE into 49 minutes...
I hate 'Now You Know' channel for stretching his videos.
Amar Khandve bright side too, they are all and channels you shouldn’t watch, and not just because they stretch their videos
@@andrewzhang1290 The problem is that videos of less than 10 minutes are not considered as much by the youtube algorithm. It's Google's fault for forcing people to make 10min+ videos or risk disappearing from feeds (even of people who already subscribed!). If youtube is your income, you better do what you need to survive and not get drowned out by the masses of content uploaded each day.
More like 5 min of kindergarten rocket science stretched to 49 minutes.
@@CookingWithCows UA-cam is simply a platform for people to upload videos. It's purely UA-camr's fault to stretch his videos sacrificing quality
No.
Because raptors commonly optimize for small agile males and larger females able to carry more.
Thus, they would be queens.
Good job on those animations!
Spot on.
Scott , you had to be that guy “ ACTUALLY “, 😂🤣😂🤣😂🤣. And Actually you are correct. BTW really enjoy your work
Scott, you are the daddest dad to ever dad.
Clever girl....
Are we talking avian or reptilian here? There are raptors in both families.
Me before the video: “gosh 50 mins? Better be good.”
Me after the video: “gosh 50 mins? Why so short?”
u illigal its 49:01
@@fille0078 49:02
@@fille0078 Are you 5 years old?
@@flamu9183 ehh no. what my spelling? well im from Sweden. so if thats the case then you judged a book by its cover?
The fact that the F-1 holds up as well as it does despite how old it is speaks volumes about the sheer engineering that went into the Saturn V. Truly a beautiful craft that I hope will always be remembered in this new era of spaceflight ushered in by SpaceX and beyond.
Very well said. Bravo.
Didn't the center engine on Apollo 13 shut off?
I mean, the F-1 did have 2 total military fundings, the first was for ICBMs, and the second for Apollo. So it's numbers are insane in even more ways, sadly that also includes price.
Absolutely incredible. I’m speechless. Can’t believe I actually just watched this video on UA-cam for free...
Wait, what? You got this for free? What the hell, Tim?
Haha this an excellent video. Wouldn't have paid for it though.
Wtf is wrong with you people? Why everyone keeps saying that. And they are saying that more and more often every day. WTF?! Do you really want UA-cam to shift to paid platform? I mean it - UA-cam is already WAY more commercials rich than ever before. 💰 just keep reminding them how ready you are to pay them.. F**k sake... Can't you just admit that particular author of the video is great and is making great content, period?
What is wrong with you people 💲 💵 💸
@@JayPixx chill dude, he didn't go and tell youtube to make every video paid stop overreacting also, are you high?
@@mastershooter64 the thing is, it's not about him (as I stated clearly in my comment). It's about general "trend", call it anyway you want, that people are putting this comments under every long, good quality video. Come on, seriously?
As an aerospace engineering student, I can say that some of this video is basically a sophomore class, but the real propulsion stuff, that’s straight up senior year content, this video is a senior year Aerospace engineering lecture. Here’s the classes you hit on:
Intro to Aerospace Engineering 2
Thermodynamics
Propulsion
Advanced space propulsion
THE Ohio State University lol
Given that most of the people watching this aren't aerospace engineers, I thought it was perfect.
I mean in class the maths of everything is done too, but the concepts are here pretty well.
I'm at Swansea University and I'd say this was a nice summary of a view of the early lectures in my Rocket and Space Technology module in 2nd year. Great video, really well presented!
@@SgtSayWhat Hey fellow swansea student! :D I graduated last year.
BAM!!! That's a high grade script, animation and delivery! Well done!
Q
Q
Agreed. If only he could learn when to use 'there are', instead of 'there's', and stop using 'literally' when there is no literal reference, then I'd stop questioning if the rest of it is based on wrong assumptions.
@@madintheheid Imagine disregarding the entirety of an hour long video about literal rocket science because you don't understand that language changes over time.
The fact that this is free to watch is insane. Excellent work!
I'm so old, I remember when TV was educational...
I'm guessing you owe a lot of money.
It's not free you watch a ton of ads
Stop mentioning it. You're giving Google ideas for monetization.
Lol stfu its youtube.
I'm retired from a technical career. Over the years it was clear, whenever I was given a technical briefing on a subject I was unfamiliar with, and the person giving the briefing was unable to adequately explain the subject in "layman's" terms, it indicated that the person doing the briefing did not truly understand the technology. It is obvious that that is not the case here. Excellent orientation! Very impressive!
"just read the instructions"!
@@E-Kat rolf
Or s/he was Dyslexic
@@MFKR696 Actually, technical careers are some of the best careers for Dyslexics. Dyslexics also make up a whopping 25% of CEOs. So, it's safe to assume that they could easily be Dyslexic.
“If we can’t explain something to undergraduates then we don’t really understand it ourselves.” -Richard Feynman (paraphrased)
This is what I was hoping the internet would be. Thanks for your hard work!
you still use the Matrix screensaver?
There is no internet, Neo
Ditto
Best 49 minutes I've ever spent!
I would just like to say that I appreciate the production value of your videos. You make it easy to follow along, even though you're explaining highly complicated topics to lesser thinkers like me lol
This is probably one of the best videos on rockets I have ever seen. The amount of information you crammed into 49 minutes is crazy. Thanks!
Decidedly so. :)
That was 49mins? Yikes... but speaks for the content!
Everyday Astronaut has a high information density compared to other videos
Insanely great production, including the animations and footage. Just as a general comment on the growing quality of the better youtube channels ... it's the clearest indicator yet that the end is nigh for broadcast TV. On TV this would be dumbed down to moronic levels, while advertisers would be scattergun-blasting to a dwindling and fragmented audience.
Falcon Heavy yep. Amazing quality.
It's so good to hear "we'll talk more about that in a second" than "we'll talk more about that in the next video"
I just discovered your channel. Thank you for the deep dives. I have learn a ton from you over the past week or so. Keep up the great work
This video is a timeless work of art. I plan on watching it many more times. Thank you so much for making it.
Me: "I'm definitely not going to watch the whole video"
*49 mins 1 sec later*
"Ups.."
I was a bit like that, "I'll just see how this starts..... "
Yeah, same.
I watched it
I came to the end and was like "What, he can't be done already!"... Really looking forward to more!
For real tho. I’m supposed to wake up at 6:30 and it’s 2:30. RIP
Elon watched the video and provided some additional input in this tweet - twitter.com/elonmusk/status/1132386984444383233?s=20
"Great video. Couple notes: Raptor designed for subcooled CH4/O2, so propellant density & thrust increase up to ~8%, as needed for mission. 380 Isp & up to 50% thrust/weight improvement over time. Merlin thrust/weight doubled from V1, but Raptor is closer to optimum."
and this one - twitter.com/elonmusk/status/1132389917722419200
"Propellant stays same, but almost everything else improves. Fundamental goal is minimize cost per ton to surface of Mars."
That's awesome! Does this mean the TWR increases to about 150?
If Elon is interested, you clearly did something right!
Do you think he watched the whole thing through? Probably on x2. Job offer from SpaceX not far behind.
Congratulations.. and Thank you for all your hard works and commitments 🙏
Amazing video! Took time but totally worth it. For future reference, this is the go to video for any rocket-engine related things
This is the second time I am watching this; I am slowly educating myself (or NASA and others are educating me at You Tube) in orbital mechanics and you are educating me in rocketry--for starters. I also want to complement you in the way you present. As an ESL instructor in Asia for nearly 20 years, I understand the challenge of explaining ideas to people which are complex--in your case, because it's rocket science, in mine, because I only use English--and my point is, you have a way of talking that is clear, emotional (difference in voice pitch and expression delineates concepts more easily than in monotone--the way many science teachers speak)--and you repeat, Tim, which is essential. I could probably help you with the writing; maybe when I have extra cash, I will join on Patreon and give ideas. But, thank you, and excellent job. Your knowledge alone earns you a valuable seat on the Dear Moon flight. Congrats on that! You deserve it.
Thank you for your service in ESL. 🤠
All the time and effort put in this video is insane. GREAT WORK!
And I was just about to go to sleep.........
I would have stayed up for 2 hours if the video had been that long. This was just amazing.
I started the video, fell asleep, slept for 10 hours, woke up, and finished the video.
Is this video the king of everyday astronaut videos?
Yes for sure
So overall, this video is the king for this application.
Kudos to Tim. He's really studied hard and has come up to speed on rocket technology. He's now a good resource on the topic and is entertaining at the same time.
@@SpaceReportNews Or, just getting started!
SpaceX sucks at making long form videos, Elon needs to use Tim to channel his inner space geek
It not only has the highest information density, but it's also the longest ever video he's ever produced so yes
Amazing work on a complex topic. Fanatically educating. Really appreciated the quality of your production and script. Great work. I know you put a lot of effort into, first learning the details of the cycles, but also then gathering all the information together on the different rocket engines and putting into tabular and graphical form to help us understand. Your enthusiasm showed through. Your explanation is next level excellent for people approaching this topic for the first time. I found this interesting and completely engaging to watch. BTW I was in high school during the Apollo program, living only 40 miles from the NASA test facility in Mississippi. I got to see an S-1 stage test firing, full duration of those incredibly deafening F-1 engines, from one mile away with the press. The sound pressure rocked the NASA bus from side to side. I chipped my hands around a friend’s ear and shouted instructions from one inch away at the top of my lungs on the photography we were doing. He was unable to hear me. The legs of the slacks I was wearing were flapping as if a wind was hitting them. It was completely calm. The flame shooting sideways out of the flame bucket was a few stories High and I guessed about 700’ long horizontally. It was wickedly ferocious looking. It’s been a little over half a century now but I’m still impressed by my memory of it. I later flew down to the cape and watched the final flight of Apollo, Apollo 17, lift off at night from 10 miles away. We could barely hear it by comparison at that distance, but it lit the sky up like a sunrise. After staging with the hydrogen burning second stage engines, it looked like a breeding start moving rapidly through the constellations. Many years later, during the Shuttle program, I saw one reentering the atmosphere late at night from Gulfport Mississippi heading south to fly over the Gulf of Mexico toward Florida at an altitude of 35 miles at a speed of 5000 mph. I got that information the next day via a phone call to the Johnson Space Center. It looked like an orange meteor with a long white tail of ionized gas. It casts moving shadow under a bright streetlight. Two minutes after it faded out over the Gulf I heard a characteristic double sonic boom. I never saw it launched though I drove down to KSC and waited once. I never had another proper opportunity. Hopefully the SLS will become a flying vehicle one day, assuming a lot of things, and I can go see it. I have a much longer way to go to beer there these days. I now live in Iowa, only about 2-1/2 hours south of you! SRBs are very very bright. I saw the launch of Voyager 2 in 1977 from 4 miles away on a tour bus on a sunny summer Saturday. It like looking at two Suns, the pair of solid rocket boosters strapped on the Titan rocket. Of course those were much smaller than the ones on the Space Shuttle and what will be on the SLS. I’m looking forward to seeing if I can get as close or closer to a launch and get “blinded” by the light. We’ll see…🤷🏼♂️(Wow WOW would I like to see a full up flight of Starship some day too. That would be incredible. The noise!)
Brilliant explanation of the different types of rockets in a simplistic yet informative manner. Great work, looking forward to seeing the future of rocket development thru your eyes.
Ok i must say you have surpassed yourself
, a very complex subject simple explained and visualized!
Great Job, probably the best video of you yet!
Ich: klicke auf ein Everyday Astronaut Video
Sehe Don Guru de Bro & Paul Paulson als Top Comment
Checke ob ich mich nicht verklickt hab und bei PietSmiet gelandet bin :D
Yes agreed! Great video💪🏻💪🏻
Agreed! Wish I could punch the "Like" button a couple dozen more times. Excellent video.
Came here to say the same thing. Incredibly well researched but easy to understand. One of the best videos he's done!
Wow! Great video.
Upvoted because for the first time ever I heard an understandable description of specific impulse.
Tim, do I need to mention how much we appreciate your work and especially the consistent use of metric system? Thank you!
By far your best effort yet. Thanks so much for your easily digestible treatment of these complex engines.
Man, this video has a LOT or work behind. Thank you Tim.
My sister asked me today to help her with a presentation about rocket engines, so this video came at exactly the right moment.
It's really impressive how you managed to explain that deep topic with so much detail, but in a understandable way. Most videos about engines I know are to basic and don't go into so much detail. Amazing work putting this together!
Thank you very much for this.
You explain Rocket science in a way that I could say "It's not a rocket science dude! It's easy!"
Great job! Please do more.
I've never felt more drawn to join a patreon for a yt channel than I am for this one. Truly inspiring stuff
Best 48:45 mins:secs that I've spent in 67 yrs. Well done!
That honestly didn't feel like 49 minutes. This was so interesting and well done. Keep it up Tim. We really appreciate it.
just watch at 2x its like 24:30 min video bro.
Excellent! When comparing fuels, it’s more appropriate to compare characteristic velocities as the specific impulse is dependent on engine architecture.
Keep up the great work!
And lastly-This video is truly one of the greatest videos on the Internet!
Me at first : 49 mins ?!!!
Me after 49mins : "Definitely worth it"
true
very true😁
Before: so long?!
After: so short? :c
+2 seconds
i was about to skip but got carried away
This is a contender for best video on youtube for the year. Astonishingly good
@Gmail X lol... russian botttttt
@Gmail X I often imagine that Elon Musk is Sergei Pavlovich reincarnated...
@Gmail X OK comrade... hahaha
@Gmail X "and is triumph of marketing" and "you must educate yourself moron" is a double negative and cancelled each other out... one of us need to get an education Comrade... 🤭
@Gmail X Trump.... lol not my problem bro...
Just about the finest video I've seen you do, congrats!
People like this are a gift to the world because there is so much to teach and learn now and they help us put it all into the right context while making us curious to know more.
totally right!
Yep
@@radiofreealbemuth8540 methane power is way to go ,tried it sitting on leather seat lifted me up lucky did not ignite it.
Wow super interesting video man. Didn't even felt it's 50 mins. Thank you
+1!
*didn't feel
Wait it’s 50 minutes? I’ve only just started watching...
I wondered how it ended fast. I often get tired of 5 minute videos. Not this one though.
It wasn't 50 mins
Amazingly well documented and presented. Fantastic
Crazy how you can explain in a easy way such a hard matter, amazing video 🔥
This is what I call good journalism. Thank you Tim
That's not journalism that's shilling.
jou-na-li-sam... what is that? i havnt .. Oh.. Yes, now i remember, it was that thing the news did over 20 years ago where they presented facts on different subjects or investigated problems. Nice to see it existing, sadly never on the news channels, those just lies and clickbait BS...
@@clausejoke1985 do you really think tim is getting paid by spacex to promote their rockets?
@@linecraftman3907
I don't know, but he is definitely a victim of SpaceX's PR and hype.
None of Musks companies has ever invented any groundbreaking/new technology.
Landing is a maneuver not a technology, this should tell you everything you have to know about Musk and his companies.
A lot of bullshit claims and promises, but no substance.
Highest paid CEO but he is doing it for mankind.... dear god you guys are naive.
www.bizjournals.com/sanjose/news/2019/04/02/tsla-median-pay-musk-compensation.html
He is also a union busting drug addict and convicted fraud.
Do you want me to stop now?
@@clausejoke1985 it's not about inventing new technologies, it's about making it work in real life. Drug addict? People don't choose to be drug addicts most of the time. However I do agree about shady business practices and bad work conditions , but who is holding the workers in the companies?
Never clicked so fast. been waiting ever since you announced it on OLF.
OLF FTW, Its a great podcast.
It surprises me how little people watch/listen to OLF. Only ~15k!
Blah Cga our ludicrous future. Look it up as our ludicrous future it’s a podcast with joe Scott(answers with joe), Tim(everydayastronuaght), and Ben sullins(teslanomics)
Great video. Didn’t know if I could sit through a 45 minute UA-cam video, but it was so well done and so much good information presented so well. Thank you for putting the time and effort into this.
Thanks for putting the hard work in for this video. I had no idea that rocket fuel pumps were turbo powered. I'd assumed they were electric. Learned something new. Also very interesting were the difference in fuel properties and the explanation of why CH4 is a good compromise. Well worth the watch and those 49 mins flew buy.
5 freaking months for this? 100% worth it
You know, when people say "it's not rocket science", I hadn't realised the bar was quite that high.
Ralph Pickering i’ve heard in rocket science you say
It seems way more difficult because people don't come across the information in regular life so everything is completely new. I mean you can show a person a simple scientific formula, e.g. to calculate the average, and most people still wouldn't understand it
@@MaxMustermann-bm7qt Oh my goodness! Rocket science is so simple compared to music theory. I can read music and play guitar. Still I have almost no comprehension of music theory in general, and guitar theory in particular.
I saw what you did there.
👏🏻
Now this is a fantastic video! Thank you for your efforts. Very well done. Cheers.
@Everyday Astronaut Best video yet! Very detailed and informative keep up the good work!
despite being 49 minutes long, I was enjoing it so much it felt really short.
The professors in my aerospace engineering program didnt deliver this info a 10th as well as you have. And this video was free, where as my degree... was not.
@Cosmonauteable mhhh okay, but you're saying he could have learned it by himself without going to school. This means the teacher was not good anyways
I don't think any given professor has five months to prepare for a single lesson. Sure, he should know his field in general, but consider this: how do you keep up with the fast pace of science if you have to teach students, plan lessons and correct tests and essays full-time? While you would also love to advance your own research?
And how does your free youtube history do when applying for a job?
Try putting your UA-cam history on a job application.
@@RandomNumber141 try making an original comment
Thank you so much brother , this simplified explanation was so great for me . Keep going 🔥
Seriously one of my favorite videos on the platform. A close second is drachinifel’s video about navy ship boilers.
Amazing how you were not only able to inform me of the basics of rocket engines, but you kept my attention for the entirety of the video. Tough thing to do these days, absolutely wonderful video.
Totally agree with you, and well put Nathan!
I had to cheat and boost the speed of the vid to 1.25%.
"Rocket science, like all things, is a complex set of compromises." -- best line of the whole video.
One should not take lightly the expression, 'It's not rocket science.' again. Rocket science ought to be applied to every day thinking really. Balancing proportion, Goldilocks principle. Deep video. New sub.
First of your videos I've seen. I liked it so much that I subscribed without hesitation.
I am doing some catch up on my knowledge of the current progress with spacex, thanks for making this incredible historical record of our progress for folks not in the industry.
Thank you for making this!
Didn't know you watched Tim also. I like your music, G.
Weird to see you here, also when is the marble machine X gonna be done
@@Cryseris Maybe watch his stuff, then you'd see ^^
Wasn’t expecting you to be here
U americans think u r exceptional in everything u think u. Hope and talk about going 2 Mara soon. U haven t even gone 2 the moon yet
This is so awesome so glad I found this channel thank you for doing what you do
This helped me prepare for my spaceX interview! Thank you for your hard work!
Best animations detailing different engine types. Super good job!
Wow! So much information coming at just the right speed for comprehension, the time flew by! All in one video was the right call
Incredible amount of work put into this channel. Thank you
Great video, Tim!
Watched it twice with the same amount of joy!!!
"So why did spacex use methane?" Thrust is blue and look cool
blue flame go brrr
It might be blue but it's the bomb
I bet they got the idea while farting on matches.
NHAFXD GLITCHER シ i got the reference 🥳
Because we are able to produce it fairly easily, unlike hydrocarbons like traditional rocket fuel..if we find the right materials we could make it on Mars..
I feel like I should have earned college credits for this.
You would pass the exam.
Congratulations!
I literally took a class on orbital physics and spaceflight and the math/calculations involved is soooooooo tedious.
It isn't for everyone but it was worth it!
They give some degrees out for less, these days!
.
Feelings!
soooo woke?
Somewhere between history and antique methods for propulsion.
@@BxBxProductions welcome to modern academia.
Okay, the student is finally ready to think freely and have original thought patterns.
Let's see..... Dangit.
Again, before we could unlock free thinking; the student died of old age.
This may be the best video on UA-cam. Interesting, educational, well-produced, the presenter is clearly a well-balanced human being, and it was even funny here and there. Complex topics (literally rocket science) are presented in a digestible manner, and the animations are both useful and very professionally done. This video is a masterpiece.
Great video, loved the fathom quip, you slid it in quite nicely.
I can fill in some of the knowledge on Metallurgy, if you are interested.
Basically, the mechanism by which metals fail, or "yield," is by the propagation of imperfections in the crystal lattice. The imperfections are called "dislocations" and there are usually millions of them in any cubic millimeter of metal. Dislocations tend to move more easily as you raise the temperature of a metal, causing yield strengths to decrease with higher temperature. The methods of strengthening metals generally center around trying to halt the motion of these dislocations, either by adding alloy elements which tend to stabilize dislocations at the atomic level (such as adding carbon to steel), or by precipitating secondary phases (like small crystals within the crystal) which act as roadblocks to dislocation movement.
Secondary phases are usually precipitated by raising the temperature of the metal and aging it for a certain duration. Aluminum is an example where this is very common. Metallurgists have determined the proper time and temperature to age metals to get the maximum strength. The longer you age, the larger the precipitates grow. If the precipitates are too small, dislocations cut through them. If they are too large, dislocations will bend around them. If you age at the wrong temperature, or the wrong combination of elements, precipitates will form along grain boundaries instead of inside crystal grains, which doesn't add strength, and can weaken the metal. Precipitates must be fairly small, and uniformly spread throughout the crystal in order to add strength to the metal
Precipitation hardening is especially common in Aluminum alloys. Part of the reason aluminum is fine for airplane skins but not good for engines revolves around the fact that precipitation hardening is lost once you raise the temperature above a few hundred degrees, as the high temps will cause precipitates to grow, combine, and migrate to grain boundaries.
You mentioned work-hardening of stainless steel. Work hardening is a mechanism where you basically limit dislocation movement by adding a whole lot more dislocations, and forcing them to move until they run into each other. By deforming the material, you push the dislocations until they start to stack up, which gives resistance to further propagation of dislocations. The downside of this is that you lose some of the metal's ductility, which is the ability to "bend before breaking." This means that if you have sudden, large force on your structure (shock load), it is more likely to fracture rather than bending or denting. No doubt the engineers at SpaceX are aware of this, and have adjusted their safety factors and fatigue analysis numbers to compensate.
I'm two months late, but I'll say it anyway, as a fabricator who is very much NOT a metallurgist, I appreciated reading your comment and learned a bunch. Cheers!
Wow! Very informative comment. Thanks
*through use you find fatigue.* Simple as that. Just look at the number of launches *AND* landings.
Popular Science had a great article back in the day about turbine blades in jets and how they would specially heat the blades and then cool them from one end to the other producing a blade that was essentially a single crystal.
Wow, that explanation makes all kinds of sense:) Well done!
Einstein said time is relative, today I experienced it. Never felt 49:02 minutes pass so fast.
were you travelling at the or near the speed of light ?
I watch this video about once a month. It's still just as fascinating. Excellent work!
I remember watching this thinking the raptor numbers were aspirational that would never be achieve. Boy was I wrong, we are already past those.
Info #1 and #2
RD171 actually flew almost 100 times. Much more than F1
Also, the RD170 (differs from RD171 basically with relation to the gimbal direction) was able to achieve a peak pressure of 306,2bar at chamber pressure.
You are the first person to make specific impulse make sense. Everyone else is just like, well it is in seconds because that's how the math works out.
that's why I prefer Isaac Arthur's approach: specific impulse can go take a hike, exhaust velocity is way better!
Because that's how mafia work.
Hahahah
The reason they use seconds is because the math works out to being the equivalent of "how many seconds would sea level gravity need to pull on the exhaust to counter its acceleration"
If gravity is 9.8 m/s^2, then a fuel with an exhaust velocity of 980 meters per second would have a specific impulse of 100 seconds.
@@andrew34765 I get that now, but no one ever explained that. And wikipedia wasn't much help either. People would stop their explanation at, that's just how the math works, and not go any further.
Really Fun and Informative Video, Thanks for Making it!!!
Love your videos. Me and my dad are hooked on rockets. We watch every spaceX livestream. Really appreciate you putting out these videos.
"The Raptor is truly a GoldieLOX engine..."
A AAA AAAH
Absolutely incredible. I’m speechless. Can’t believe I actually just watched this video on UA-cam for free...
Not funny
Didn’t laugh
*sighs in defeat.* you got me bro
@@karanguyen7569 you copied another comment, oh well
This was very well explained. The visualizations were very helpful.
Tim, this is a masterpiece. Thank you so much! You are such a excellent teacher. All the best from NC.
I cannot fathom the quality I find in this video. Part from being enlighted and encouraged - I realised that it sucks to live too far away. Just tried to order some merch only to find out that it cost $15 to buy and in addition tripple that amount in delivery costs. Doh!
Still. What you do here is just friggin awesome! Thanks for doing this, delivering it with enthusiasm and easy to understand narrative. You truly brinng space to earth. :)
This is the most interesting online class I've ever taken. Can't take my eyes off the screen. Keep it up.
Much more interesting than quarantine
He is not that good looking.....)
@@tiborpurzsas2136 dumbest comment ever !!
Get a brain, Ken !!
@@tiborpurzsas2136 what r u gay?
@@tiborpurzsas2136 I actually think he is good looking :D
You deserve awards for this work. Truly outstanding, Tim.
Yeah, like going around the moon? :p
Great job Tim. Your explanations are very clear. Combined with the excellent graphics this is a very instructional video. Keep up the good work.
I have to go back and re-watch this video every few months. It makes more sense every time.
I almost never watch a video longer than 30 minutes, but you kept me interested! Awesome video!
4:28 I like how you spent at least an hour blending their faces on the picture for just 3 seconds in the video.
38:11 As for current time, seems Merlin engine has proven at least 10 times reusability with real flights, after 10th launch of B1051
March 2023 booster 1058 15 launches 15 landings
December 23rd, 2023. Booster 1058 has completed 19 launches and 19 landings.
Tim Dodd, thanks for all the awesome videos. You inspire me to study Aerospace Engineering. Your teaching and explaining things on very high technical subjects makes it easier to understand. I watch the video over and over, I learn more about rocket engine - physics, thermodynamic etc. than reading it from the book. I watch all your videos while doing cardio exercise at the gym...it becomes my daily routine studies, it makes time flies just like the rocket engine going into space. :P :)
The best technical video I've seen on UA-cam in 2019! And...it's about rockets!! Excellent job! I could actually follow along with your explanations and data without getting bored. Keep producing more videos like this.
this is dope I'm gonna search your videos to see if you talk about the RS-68 ever! New subscriber @everydayastronaut great work!
The most informative 50 minutes I ever spent on UA-cam. Thank you.
thank you , its a great honor to see a master at work
I sometimes encounter some 5 minutes video and feel pretty wasted. This 50 minutes felt like a 5 min video. cool informative
I don't usually comment on videos but had to stop and say thanks for making this. Incredible work! Subscribed
I wonder how many engineering classes you would have saved rocket engine designers. Great job I was totally enthralled!!
Who else is here after raptor achieved 330 bar?
many it seems :D.
Yeah I had to come back to compare. So 300 bar is 3km deep, now it's 3.3 km deep That's 30% of the depth of Challenger Deep! Yikes!
Here🙋🏻♂️
same xd
Me too
If cars can be rated in horsepower, can methane powered rockets be rated in cowpower?
-bigbraintime-
@@ryp1562 the joke went over your head
Cowpat
It should be rated in llama thrust
This would a great engineering project for Mennonites. A cow rocket fueled by hay. Probably would get their cattle faster to market too
Had to watch this again for the large amount of information to sink in. Well done, and very well explained!
Very nicely done. Glad I watched. Your explanation and presentation are awesome. Thanks
WOW! Just finished this video. Even though I knew most of this stuff partially, this video helped put it together in my head. Amazing Job!!
I was at the same spot with my rocket knowledge... It was nice to finally put all the pieces together.