I CANNOT believe this is free. Thank you Tim for everything you do. This is incredible and an entire generation is learning about space travel because of you. 🙏
Me, an hour ago: "Yeah, rocket engineering is complex, I know." Me, after watching this: "Holy cow, how did they ever manage to NOT blow up every single space shuttle on the pad?" Great, informative content, Tim! Thanks for this.
Yeah, it does make it even more amazing that the V2 rocket managed to be pretty successful 80 years ago. I guess the hydrogen peroxide powered pump made things much simpler, if less efficient. The fuel wasn't cryogenic but did they precondition the liquid oxygen pump? Was it just built strong (& heavy) enough to withstand pressure surges at startup?
@@Loanshark753 Rocket Lab circumvented about HALF of the complexities by going with battery powered electric motors to run the fuel and oxidizer pumps vice using the propellants themselves which is literally an almost one hundred year old 1930's approach. I cannot see why there could not be a combination of the two, use electric motors to get the pumps running and the engine started THEN chuck the motors and batteries on the way up to save weight and let the pumps run from turbines like "normal" by burning internal fuel and oxygen to spin turbines, BEST OF BOTH WORLDS. It would eliminate a LOT of hardware. And hopefully at some point in the future batteries will be sufficiently robust to run the pumps with electric motors ALL the time.
@@michaelschnittker7388 Except when you get to the part about chucking, it fails, and crashes into your rocket destroying your lower stage. I think we should just put a little wind turbine under the rocket and have it spin with the propulsion. No way that could go wrong.
I'm waiter. The fact that I sort of understand the engineering behind rocket engines because of the work you do is kind of insane. This is some of the best educational content out there. Beautifully explained and produced. You are a legend, my friend. Keep up the good work
"... understand the engineering behind rocket engines ". Do you?!!. I never understood how this guy can talk for an hour without actually saying nothing! Is he an engineer?
I think we can safely say this is one of the most anticipated videos that everyone wants to watch. Thanks for all the effort you and the team put into it! 😊
Like many of you, I’ve already watched the 2 videos recommended. The “Everyday Astronaut” deserves a flight to the moon and back home safely. I’ve learned so much from this channel.
I'm just at the beginning, but Tim, brother you have really taken your love for rockets (all of it) and come SO FAR!! You have assembled the highest production quality team of genius people and so much talent on your team Tim, wow. You're SUCH a GREAT filmmaker!! You really deserve whatever fame and glory you have gotten and will continue to get. I'm amazed every video you create for us all to enjoy free. Thank you SO much for the hard work, all the sleepless nights, the long hours, just to share your experiences and learned knowledge with us on TH-cam. You're one of a kind Tim.
Can all this information be found on the internet? Or do you need to have a SPECIAL team with VERY INTELLIGENT people to make a video or learn something like this?
As an amateur rocketeer who has been attempting to make a funtional liquid fueled model rocket for 3 years now, this video is invaluable to me. Thank you so much Tim, the work you do to make this information more accessible is amazing. Keep it up. PS: I can't wait to join you in losing our minds over the first full stack Starship launch, I'll be watching live even if I have to take an extra break at work.
LEARN HOW TO SPELL FUNCTIONAL CORRECTLY FIRST.. NORMALLY IM NOT A GRAMMAR NAZI BUT IN TERMS OF ROCKET ENGINEERING WE CANT AFFORD TO BE MAKING THESE KINDS OF MISTAKES.. ITS LITERALLY THE DIFFERENCE BETWEEN SUCCESS AND FAILURE..
Tim, I feel like I finely understand rocket engine power. I have been fascinated since I was a kid in the early 60's but no matter what I read, I had never really been inside a rocket engine, until now. Thank you for doing your homework and explaining it so well. Your interviews and deep-dives with rocketeers are gritty and enlightening. Also, I appreciate all the work you did to put this video together.
I've been watching this channel since you were just live streaming Spacex launches from your house. To see how far you've come in such a short amount of time is quite incredible. I've learned so much in the years I've watched. Hard work surely pays off, keep it going friend.
This is an awesome video, great job!! I'm a propulsion fluid dynamics expert at NASA, and I learned a bunch from this! Some of the folks I work with are involved with RS-25 startup, and it's really cool to see their work showcased so publicly like this. Also, I'd love to see a video on engine throttling!! You could go through solid rocket grain shape, in-space thruster pulsing and impulse bits, and of course the wild world of launch vehicle engine throttling and deep throttling. Great topic to add to your growing collection of incredibly informative rocket propulsion videos.
@@steveschritz1823 following this, we get a great doofenschmirtz flashback-type backstory where he talks about his uncle, Werner von Braun, who was too busy with his rockets to ever attend one of his birthdays
Tim, this is easily one of the best videos you’ve published to date. You truly captures that feeling I used to get watching the discovery channel when learning something new and fascinating! Thank you for all you and your team’s hard work in creating these deep dives!
You must be extremely old! Do you remember that other channel called "history"..? I'm just joking, but honestly TH-cam has gone from low quality sub 10min "nonsense". to having the best, incredibly in-depth, educational "content" that exists today. In literally every subject / niche. ( Some Premium & Paid subscriptions are okay, but) TV entertainment models. high cost production, decompressed , fluffed or dragged out & interrupted delivery. Low information destiny, or low/no amount of educational information, either to fundamentally or completely understand. & actually learn anything at all. In a limited frame. Tim is probably the most influential or best of educational, space/rocket, creators! I'm so happy he won dear moon contest! He has continually improved & multiplied content quality so consistently. I say he can't get any better yet he does!
One of the best? I dunno. Top 100 surely. Nearly every explainer Tim does, is simply awesome at taking twisty complex stuff and making it clear, often simple. I know what you meant though. Hard to select the right superlative when every effort vastly exceeds expectations.
As a programmer, it sounds like rocket engines are like multi-threaded applications where each word could lead to a explosion instead of error messages. Insane and really well done lol
Excellent work, once again! Thank you, I learned a lot! One last thing, as a retired professional aerospace engineer, I am super-impressed with your deep dives. Takes real effort to absorb all of this material and you have real talent!
One of the top 10 science communicators in the WORLD. I would say top 5 but i have to give respect to the OGs. This is how advanced learning should be. The real time graphs. The repeated definitions after a mention of a particularly complicated subject. Real time examples from sourced videos! Jeez i can't praise you enough for keeping my ADD brain locked in to litteral ROCKET SCIENCE 😂 i love it. ❤️
I will never get tired of watching RS-25's spin up in slo-mo and seeing the engine bells resonating like literal bells in sympathy with the initial shockwave when the engine transitions from pre-burner to full flow. Then watching the boundary layer spread out across the nozzle wall as combustion stabilises. So impressive, I love it every time.
Wow! Knocked it out of the park as usual! 'Appreciation' is the word. I had no idea, and Tim, you're absolutely right. Developing a rocket engine design to the point where it can be reliably fired up is a very impressive feat. I did not appreciate this previously. Thank you 😊
Videos like this are why I donate to this channel. It’s inspiring, fascinating and I feel the collective passion of everyone involved in making these videos. Never stop inspiring 💪
Tim, nice job as usual! Very informative and presented in a way that is easy to follow. You truly are the Everyday Astronaut bringing space down to earth for everyday people.
Holly cow, this is shocking informative! You had done an excellent work on the previous two engine introduction videos, but this is a whole new level of information. I can’t believe you even made animation along with graphs that breakdown every section of the engine bootstrapping…. It is mind blowing Thanks for the amazing work, Tim, excellent job , as always!
OMFG! 200k views in just 2 days on a DEEPLY geeky topic? Tim, you totally rock as a tech explainer! Separately, it is very impressive that there are that many people on earth who want to watch this. A measure of someone really understanding something, is the ease with which they explain it in relatively simple words. Bravo!
Great job as always Tim! This video is one of the most knowledge-packed pieces of content I've ever seen, and quite frankly blows even your other deep dives out of the water. I couldn't have said it better: it really does give you an appreciation for all the hard work that goes Ito engine development. I think anyone who regularly complains about how long it is taking to develop an engine really should use this as a reminder of just how ridiculously difficult solving every single minute problem during startup really is. This one was truly worth the wait.
Thanks so much Tim! Again, you've created a college level overview and put it out there for the general public, at no real cost to us. Amazing, simply amazing. I've only viewed up to the "Starting a Rocket Engine in Space" segment so far, but the explanations along with diagrams and video are all adequate for the non-rocket scientists like me to "Get it", or at least, get most of it. Thanks to your team as well for putting everything together! Elon sure should offer you a job! I think back on those videos where you and he were having discussions, and you both were doing "Real time" design on the fly, that was so cool!
Yet this is still just an overview, imaging the maths and material flow science to make even a single valve work at these temperatures and pressures to operate reliably with this sort of precision and variable flow rates. No wonder it is said rocket science is hard.
Simply brilliant. I have to stay I'm not a fan of regular Everyday Astronaut content (nothing wrong with it, just too much bubbly excitement for my tastes), but these longer in-depth lectures / documentaries are truly excellent. It's not afraid of going into technical details, but it also doesn't lose the trees for the forrest. And, to top it all off, it's (as far as I can tell) entirely correct with only the most minor inaccuracies in using technical term.
This was exceptional Tim, thank you. I’ve been interested in these topics since I was a 6 year old boy (that adds up to a big number now) and you answered SO many questions with this it was hard to keep up with all of them. I hope you become convinced that you're the best at this. Andy freakin' Lapsa thinks so. Good enough for me.
Amazing work, Tim, Caspar, & team! I'm a space nerd, and I watched the previous videos and Scott Manley's video on rs25 startup. I even heard them testing rs25 engines at stennis and visited a test stand when I lived in Mississippi in the 80s (not that that would teach me how it works)... A lot of this went over my head. I'll have to watch it a few more times to fully understand it all. Thank you for all this work!
Wow, you lay down a *_LOT_* of information on a complex subject and you don't _skimp..._ I have *_loved__ it every time you have done a _deep dive_ because they're wonderfully informative. Your interviews with *Elon* were *_epic_* too. Thank you!
WOW I've literally watched every episode that Tim has referred to as examples, what a dream this guy is living everyday, great job TIM, it's no wonder you don't work at spaceX and NASA at the same time..I myself and my 6 year old son feel like rocket scientist from watching so much of Tim's content..my son AXEL would like to congratulate you on your success and expansive knowledge, maybe some day we could have the honor of watching a launch along side you his hero.. great work 😁
Tim, what you have created does benefit all of humanity immensly. Everyone can bite as much as they can, but overall we all win. Thank you for everything you have done. This is a truly excellent episode. For older folks, just imagine how many libraries you'd have to visit to get 10% of this episode in 80's or so.
Jaw dropping. I've watched this 3 times and it's still complicated. I'm going to keep watching until it sinks in properly, thankfully easily done when it's so amazingly well presented! Thank you!
Your content is so high quality and so worth having online for people's learning pleasure. And I can tell that the propellant for your ambition is the best fuel type of all: Passion. May I dare say, sir, you've found your ikigai.
It's freakin crazy that reducing a valve's throughput by 70% for 0.4 seconds will take care of crippling atmospheric pressure-borne oscillations far downstream.... really makes me appreciate how much effort must have gone through the fine-tuning of such engines!
A minor quibble: The igniter on an SRB isn't any more an explosive than the SRB propellant itself. It's more like a smaller solid rocket lights a bigger solid rocket that lights the primary fuel grain of the SRB. An actual explosive wouldn't produce enough heat for long enough to bring the HTPB of the fuel grain to decomposition temperature (which is necessary to get the fuel to light). You'd also probably blow the top of the SRB off if it was an actual explosive because it would produce too much pressure too quickly. Really the only explosive in the ignition system is the small detonator that lights the first motor - which has its own slower booster charge to ensure that it doesn't blow to pieces. Rockets are already riding the fine line between combustion and explosion, they don't need anything in there to tip them over the edge.
...And, after knowing this about a single engine startup - you are still willing to sit atop 33 of these - through their combined simultaneous startup - all the way to the moon! You truly have far more huevos than I.
This is an incredible explanation of starting a rocket engine. As a former jet engine mechanic, I am able to follow this a little bit. My mind keeps going back to the operation of a jet engine and the similarities of the two at the same time knowing that a rocket engine is a different beast.
There needs to be a place in the U.S. Astronaut Hall of Fame at the Kennedy Space Center for those individuals and groups in the public that go above and beyond to not only bring us closer to space based events and topics but educate simply for the love of it. Tim would most definitely be at the top of that list. Well done Tim! Well done!
Thanks, for this video, what a great explanation to help people at many different levels of comprehension understand the the process and procedure of how the rocket engine works. !!!!!!!!
I flew high power solid propellant model rockets for years ..and even igniting solids is quite a science in having to balance temperature and pressure within the motor for a quick and efficient ignition and thrust build up.
Sitting there watching Saturn 5 launches in 67 on TV i was 8 years old, at the time as a dyslexic kid (but didnt know) who did electronics and not football I always felt alone, different and lets face it I was the prototype geek! Now 58 years of engineering later I would never have dreamt that actually the world was full of like minded people that just wanted to understand and innovate. Tim I appreciate your skill in communicating the nuances of one of mans finest achievements and Mr Musk for the subject matter. Your interviews with Elon are truly heart warming displaying the delight of the nerd out details from both of you and you can trust theres an army of nerds out here with you all the way........nerds will save the planet!
I love how precise the times are and how they have to predict the sequences so the valves throttle properly to minimize hysteresis. I'm guessing these valves are either all electric or electrohydraulic operated. No other way to get such fast responses.
Bravo! Honestly, this is one the best videos I've ever seen on ANY technical subject. My 86 year old dad is a retired rocket scientist (propellant engineer), and I've been a rocket nerd ever since I was a little twerp. I say it's one of the best videos I've ever seen, because I found myself actually feeling nervous and tense during each "play-by-play" of interrelated variables and processes during the sequence. This edge of my seat feeling happened repeatedly, because start-up is a balancing act on the edge of catastrophe. Sure, I've seen some free-climbing videos (no ropes) that gave me the willies even worse... but dat not rocket science. A tour de force of exposition 👍🏻👍🏻👍🏻
Man, this is maybe the best video you've produced- ever. I think you succeeded in distilling this complex dance down into something understandable by everyone. Thank you! A highlight was the RS-25 start sequence and seeing the engine chaotically manage through open-loop control into a smooth, closed-loop managed control. I can't help but wonder how much of this has since been tamed with the development of better sensors and faster computer processor speeds. A follow-up short video might be cool to show even how the RS-25 of today is started compared to when the engine was first developed in the 70's.
okay, a couple beers now and almost ready for bed: I came back to watch that startup sequence again, this time imagining myself as the shaft of the turbo pump. The amount of torque just given the inertial lag as the preburner hits prime must be intense!
Hey Tim, awesome video! For the RS-25 start sequence, at 50:25 CCV sits on the bypass leg, so as it ramps down and closes, it forces more hydrogen down the feedlines and through the nozzle coolant tubes
This is why rocket science is so hard. The sheer complexity of chemistry, metallurgy and engineering to make only a rocket engine. Don't even start with physics of orbital mechanics and gravity, ugh...
I CANNOT believe this is free. Thank you Tim for everything you do. This is incredible and an entire generation is learning about space travel because of you. 🙏
There's nothing 'free' about the ad-revenue e-commerce model. You are the product, my friend. Awesome content though, Tim.
@@BravoNineThreeTwo whats an ad
Sponsored by Apple watch
Coming to you by whatever ad I didn't see using premium.
not free bud
Me, an hour ago: "Yeah, rocket engineering is complex, I know."
Me, after watching this: "Holy cow, how did they ever manage to NOT blow up every single space shuttle on the pad?"
Great, informative content, Tim! Thanks for this.
Love your channel! happy to see you here.
Maybe Rocket lab chose electric fuel pumps to reduce engineering challenges.
Yeah, it does make it even more amazing that the V2 rocket managed to be pretty successful 80 years ago. I guess the hydrogen peroxide powered pump made things much simpler, if less efficient. The fuel wasn't cryogenic but did they precondition the liquid oxygen pump? Was it just built strong (& heavy) enough to withstand pressure surges at startup?
@@Loanshark753 Rocket Lab circumvented about HALF of the complexities by going with battery powered electric motors to run the fuel and oxidizer pumps vice using the propellants themselves which is literally an almost one hundred year old 1930's approach. I cannot see why there could not be a combination of the two, use electric motors to get the pumps running and the engine started THEN chuck the motors and batteries on the way up to save weight and let the pumps run from turbines like "normal" by burning internal fuel and oxygen to spin turbines, BEST OF BOTH WORLDS. It would eliminate a LOT of hardware. And hopefully at some point in the future batteries will be sufficiently robust to run the pumps with electric motors ALL the time.
@@michaelschnittker7388 Except when you get to the part about chucking, it fails, and crashes into your rocket destroying your lower stage. I think we should just put a little wind turbine under the rocket and have it spin with the propulsion. No way that could go wrong.
I'm waiter. The fact that I sort of understand the engineering behind rocket engines because of the work you do is kind of insane. This is some of the best educational content out there. Beautifully explained and produced. You are a legend, my friend. Keep up the good work
🎉❤😢
"... understand the engineering behind rocket engines ". Do you?!!. I never understood how this guy can talk for an hour without actually saying nothing! Is he an engineer?
Not as difficult as starting my lawnmower.
You have cooling problems on that too do you?
That’s why I trashed my gasoline lawnmower…. Electric for everything possible
That’s funny
Dudeeeeeeeeee
😂😂😂
I think we can safely say this is one of the most anticipated videos that everyone wants to watch. Thanks for all the effort you and the team put into it! 😊
I showed my dad and he said he doesn't care 😔
I second this!
@@LQB42 when I said everyone I meant of his subscribers, your dad doesn’t need to care everyone has their own interests🙃
@@mixsmasher he doesn't talk to me about things I like he only wants to talk about family
I just start watching and I'm super curious if we will finally know how does Raptor 2 start.... For now it is mystery.
Like many of you, I’ve already watched the 2 videos recommended. The “Everyday Astronaut” deserves a flight to the moon and back home safely. I’ve learned so much from this channel.
Your channel iterations since 2018 are beyond admirable, Tim. This takes the space biscuit. Well done mate.
I'm just at the beginning, but Tim, brother you have really taken your love for rockets (all of it) and come SO FAR!! You have assembled the highest production quality team of genius people and so much talent on your team Tim, wow. You're SUCH a GREAT filmmaker!! You really deserve whatever fame and glory you have gotten and will continue to get. I'm amazed every video you create for us all to enjoy free. Thank you SO much for the hard work, all the sleepless nights, the long hours, just to share your experiences and learned knowledge with us on TH-cam. You're one of a kind Tim.
Thank you so much for the kind words. I appreciate it immensely! I'm glad the passion shows 🖤
he deserves to go in space for free.
This comment sums up exactly how I feel while I’m left to delve into my newly found passion for rocket engines. Thank you
Can all this information be found on the internet? Or do you need to have a SPECIAL team with VERY INTELLIGENT people to make a video or learn something like this?
Gaaaayyyyy
This is why we wait so long. Thanks for the incredible quality Tim! 🚀
As an amateur rocketeer who has been attempting to make a funtional liquid fueled model rocket for 3 years now, this video is invaluable to me. Thank you so much Tim, the work you do to make this information more accessible is amazing. Keep it up.
PS: I can't wait to join you in losing our minds over the first full stack Starship launch, I'll be watching live even if I have to take an extra break at work.
LEARN HOW TO SPELL FUNCTIONAL CORRECTLY FIRST.. NORMALLY IM NOT A GRAMMAR NAZI BUT IN TERMS OF ROCKET ENGINEERING WE CANT AFFORD TO BE MAKING THESE KINDS OF MISTAKES.. ITS LITERALLY THE DIFFERENCE BETWEEN SUCCESS AND FAILURE..
Who else is reading this comment after the 4th Starship Launch. Man was it a good one too.
Tim, I feel like I finely understand rocket engine power. I have been fascinated since I was a kid in the early 60's but no matter what I read, I had never really been inside a rocket engine, until now. Thank you for doing your homework and explaining it so well. Your interviews and deep-dives with rocketeers are gritty and enlightening. Also, I appreciate all the work you did to put this video together.
I've been watching this channel since you were just live streaming Spacex launches from your house. To see how far you've come in such a short amount of time is quite incredible. I've learned so much in the years I've watched. Hard work surely pays off, keep it going friend.
It's so rewarding to see you able to draw from your years of dedication to get the _perfect_ examples to use as B-roll/explanation shots. Great work.
This is an awesome video, great job!! I'm a propulsion fluid dynamics expert at NASA, and I learned a bunch from this! Some of the folks I work with are involved with RS-25 startup, and it's really cool to see their work showcased so publicly like this.
Also, I'd love to see a video on engine throttling!! You could go through solid rocket grain shape, in-space thruster pulsing and impulse bits, and of course the wild world of launch vehicle engine throttling and deep throttling. Great topic to add to your growing collection of incredibly informative rocket propulsion videos.
Transients suck. So lets put a transient inducer into the sucker!
ER-42 at Marshall?
„Ferb, I know what we‘re gonna do today“
What's that Phineas?
Underrated comment
You are so busted!
Where's Perry?
@@steveschritz1823 following this, we get a great doofenschmirtz flashback-type backstory where he talks about his uncle, Werner von Braun, who was too busy with his rockets to ever attend one of his birthdays
This excellent content is why you are on the Dear Moon team! Thanks for doing this!
Easily one of the best space engineering channels on TH-cam ever. Keep up the great work Tim!
This is a very impressively structured and researched video. Amazing work, Tim.
All of this in less than an hour is definitely not a long video.
I'm honestly impressed you were able to cram this much into an hour!
Each peace could easily be 30 minute video and a month long series..
@@Scott_C or even a college class
@@loganhumphries4851 nah, a lot of theory is missing for university and even the step before
Super impressive isn't jt
Wait, that was an hour!? Woof
So many questions answered! Awesome video Tim! I'm glad I was finally able to watch this
Tim, this is easily one of the best videos you’ve published to date. You truly captures that feeling I used to get watching the discovery channel when learning something new and fascinating! Thank you for all you and your team’s hard work in creating these deep dives!
You must be extremely old! Do you remember that other channel called "history"..? I'm just joking, but honestly TH-cam has gone from low quality sub 10min "nonsense". to having the best, incredibly in-depth, educational "content" that exists today. In literally every subject / niche. ( Some Premium & Paid subscriptions are okay, but) TV entertainment models. high cost production, decompressed , fluffed or dragged out & interrupted delivery. Low information destiny, or low/no amount of educational information, either to fundamentally or completely understand. & actually learn anything at all. In a limited frame.
Tim is probably the most influential or best of educational, space/rocket, creators! I'm so happy he won dear moon contest! He has continually improved & multiplied content quality so consistently. I say he can't get any better yet he does!
One of the best?
I dunno.
Top 100 surely.
Nearly every explainer Tim does, is simply awesome at taking twisty complex stuff and making it clear, often simple.
I know what you meant though.
Hard to select the right superlative when every effort vastly exceeds expectations.
As a programmer, it sounds like rocket engines are like multi-threaded applications where each word could lead to a explosion instead of error messages. Insane and really well done lol
Excellent work, once again! Thank you, I learned a lot!
One last thing, as a retired professional aerospace engineer, I am super-impressed with your deep dives. Takes real effort to absorb all of this material and you have real talent!
That RS-25 start up is insane!
One of the top 10 science communicators in the WORLD. I would say top 5 but i have to give respect to the OGs. This is how advanced learning should be. The real time graphs. The repeated definitions after a mention of a particularly complicated subject. Real time examples from sourced videos! Jeez i can't praise you enough for keeping my ADD brain locked in to litteral ROCKET SCIENCE 😂 i love it. ❤️
Thanks for the HUGE amount of effort on this video! You and your team are producing very high quality content and I can’t thank you enough!
I will never get tired of watching RS-25's spin up in slo-mo and seeing the engine bells resonating like literal bells in sympathy with the initial shockwave when the engine transitions from pre-burner to full flow. Then watching the boundary layer spread out across the nozzle wall as combustion stabilises. So impressive, I love it every time.
Wow! Knocked it out of the park as usual! 'Appreciation' is the word. I had no idea, and Tim, you're absolutely right. Developing a rocket engine design to the point where it can be reliably fired up is a very impressive feat. I did not appreciate this previously. Thank you 😊
Videos like this are why I donate to this channel. It’s inspiring, fascinating and I feel the collective passion of everyone involved in making these videos. Never stop inspiring 💪
You mean you actually pay for this crap? It's all been done before decades ago. Read some books.
Super high quality presentation! Thanks so much. This seems about as deep as you can go without losing half the audience along the way. Amazing job
Fantastic content Tim - huge congrats to you and the team responsible for making this happen. Fascinating stuff.
Great video. Your explanations are right on target for an audience motivated to learn.
So much complexity and yet zero failures to start on any mission once in space, kudos to the engineers.
Tim, nice job as usual! Very informative and presented in a way that is easy to follow. You truly are the Everyday Astronaut bringing space down to earth for everyday people.
Holly cow, this is shocking informative!
You had done an excellent work on the previous two engine introduction videos, but this is a whole new level of information. I can’t believe you even made animation along with graphs that breakdown every section of the engine bootstrapping…. It is mind blowing
Thanks for the amazing work, Tim, excellent job , as always!
As usual.. very well done! What a tremendous gift you are providing for kids of all ages wanting to learn.
OMFG! 200k views in just 2 days on a DEEPLY geeky topic?
Tim, you totally rock as a tech explainer!
Separately, it is very impressive that there are that many people on earth who want to watch this.
A measure of someone really understanding something, is the ease with which they explain it in relatively simple words.
Bravo!
Wow, beautiful diagrams of this RS-25 startup sequence, you really put a lot of effort into this video; congratulations!
Tim, how in the world you managed to the the pressure, speed, temperature graphs on the engine? Magnificent! This video is gold!
Awesome video, Tim. I'm fascinated with rocket engines and this was, while complicated, probably the best explanation I've ever heard.
Best Everyday Astronaut video in quite some time! Excellent video!
Fantastic video!!🎉 amazing graphics demonstrating the startups. Very grateful for all the work you and your team put it. Thank you Tim🙏
What a superb presentation of this complex issue. From storytelling to infographics to anything else, I'm impressed! Thank you very much.
That over pressure start up that blew out the pumps and the side of the chamber was insane looking. Very similar to a volcanic release.
We owe such an enormous debt to you and your team. Thanks as always, Tim. 🤓❤️
Great job as always Tim! This video is one of the most knowledge-packed pieces of content I've ever seen, and quite frankly blows even your other deep dives out of the water. I couldn't have said it better: it really does give you an appreciation for all the hard work that goes Ito engine development. I think anyone who regularly complains about how long it is taking to develop an engine really should use this as a reminder of just how ridiculously difficult solving every single minute problem during startup really is. This one was truly worth the wait.
I've been watching science/engineering videos on YT for years and just found this channel?? It's second to none.
Thanks so much Tim! Again, you've created a college level overview and put it out there for the general public, at no real cost to us. Amazing, simply amazing. I've only viewed up to the "Starting a Rocket Engine in Space" segment so far, but the explanations along with diagrams and video are all adequate for the non-rocket scientists like me to "Get it", or at least, get most of it. Thanks to your team as well for putting everything together! Elon sure should offer you a job! I think back on those videos where you and he were having discussions, and you both were doing "Real time" design on the fly, that was so cool!
Yet this is still just an overview, imaging the maths and material flow science to make even a single valve work at these temperatures and pressures to operate reliably with this sort of precision and variable flow rates. No wonder it is said rocket science is hard.
Simply brilliant. I have to stay I'm not a fan of regular Everyday Astronaut content (nothing wrong with it, just too much bubbly excitement for my tastes), but these longer in-depth lectures / documentaries are truly excellent. It's not afraid of going into technical details, but it also doesn't lose the trees for the forrest. And, to top it all off, it's (as far as I can tell) entirely correct with only the most minor inaccuracies in using technical term.
This was exceptional Tim, thank you. I’ve been interested in these topics since I was a 6 year old boy (that adds up to a big number now) and you answered SO many questions with this it was hard to keep up with all of them. I hope you become convinced that you're the best at this. Andy freakin' Lapsa thinks so. Good enough for me.
Thank you so much!
Amazing work, Tim, Caspar, & team! I'm a space nerd, and I watched the previous videos and Scott Manley's video on rs25 startup. I even heard them testing rs25 engines at stennis and visited a test stand when I lived in Mississippi in the 80s (not that that would teach me how it works)... A lot of this went over my head. I'll have to watch it a few more times to fully understand it all. Thank you for all this work!
Werner von Braun must have a big smile in his grave!
Also Robert Goddard had too
Fantastic video. Wish I would've gotten to it sooner. Thank you for being informative and entertaining.
Wow, you lay down a *_LOT_* of information on a complex subject and you don't _skimp..._
I have *_loved__ it every time you have done a _deep dive_ because they're wonderfully informative.
Your interviews with *Elon* were *_epic_* too.
Thank you!
Awesome video! Thank you for all of your content, especially these educational videos!
WOW I've literally watched every episode that Tim has referred to as examples, what a dream this guy is living everyday, great job TIM, it's no wonder you don't work at spaceX and NASA at the same time..I myself and my 6 year old son feel like rocket scientist from watching so much of Tim's content..my son AXEL would like to congratulate you on your success and expansive knowledge, maybe some day we could have the honor of watching a launch along side you his hero.. great work 😁
In just one hour Ive just had the best education ever on rockets, bless you mate.
Excellent video as always, thanks for this Tim
The video is SUPER! Absolutely great presentation, graphics, and script. You are a wonderful teacher. Thank you so much.
Great Video as always. I was waiting for this video from a long time. Great Job team!!
Well Done, Tim....!!! extremely informative, never knew just how complex engine startup actually was...
Thanks to you and your team, another fantastic video.
Tim, what you have created does benefit all of humanity immensly. Everyone can bite as much as they can, but overall we all win. Thank you for everything you have done. This is a truly excellent episode. For older folks, just imagine how many libraries you'd have to visit to get 10% of this episode in 80's or so.
Thanks Tim for shedding light on the work we do. I can't take credit for the mechanical but avionics is my thing.
Amazing quality Tim, thank you.
Dude that demo 15:56 is kinda wild. Madlad is hand pumping H2O2 and standing next to that exposed spinning rotor. Kinda spicy.
Jaw dropping. I've watched this 3 times and it's still complicated. I'm going to keep watching until it sinks in properly, thankfully easily done when it's so amazingly well presented! Thank you!
Excellent video, The graphics really help to visualise the stages in the engine firing. A+ !! 👍🙂
Tim, this was the most fascinating and information rich hour I ever had in my life. Will have to re-watch it at least a couple of times.
Your content is so high quality and so worth having online for people's learning pleasure. And I can tell that the propellant for your ambition is the best fuel type of all: Passion. May I dare say, sir, you've found your ikigai.
Thank you so much for this kiddo. You've answered soooooo many questions I've had over the years & explained in a way I understand :)
It's freakin crazy that reducing a valve's throughput by 70% for 0.4 seconds will take care of crippling atmospheric pressure-borne oscillations far downstream.... really makes me appreciate how much effort must have gone through the fine-tuning of such engines!
This video is fantastic. The most interesting hour I have spent on TH-cam by a distance. Well done.
Very detailed and very well explained video on a complcated subject. Congrats bro and thank you.
Absolutely brilliant Tim. Incredible!
What a pleasure to watch. Thanks Sandy and the team. ❤
@EverydayAstronaute Now that was an extremely interesting show on engine’s&process method. Thanks bud. Appreciate the effort &Hardwork. Gained a lot.
A minor quibble: The igniter on an SRB isn't any more an explosive than the SRB propellant itself. It's more like a smaller solid rocket lights a bigger solid rocket that lights the primary fuel grain of the SRB. An actual explosive wouldn't produce enough heat for long enough to bring the HTPB of the fuel grain to decomposition temperature (which is necessary to get the fuel to light). You'd also probably blow the top of the SRB off if it was an actual explosive because it would produce too much pressure too quickly.
Really the only explosive in the ignition system is the small detonator that lights the first motor - which has its own slower booster charge to ensure that it doesn't blow to pieces. Rockets are already riding the fine line between combustion and explosion, they don't need anything in there to tip them over the edge.
...And, after knowing this about a single engine startup - you are still willing to sit atop 33 of these - through their combined simultaneous startup - all the way to the moon! You truly have far more huevos than I.
This is an incredible explanation of starting a rocket engine. As a former jet engine mechanic, I am able to follow this a little bit. My mind keeps going back to the operation of a jet engine and the similarities of the two at the same time knowing that a rocket engine is a different beast.
One of best you tubers out. Amazing videos they never disappoint. Thanks tim
🤯impressive work, dear sir! Always a pleasure! Thank you so much.
There needs to be a place in the U.S. Astronaut Hall of Fame at the Kennedy Space Center for those individuals and groups in the public that go above and beyond to not only bring us closer to space based events and topics but educate simply for the love of it. Tim would most definitely be at the top of that list. Well done Tim! Well done!
Thanks, for this video, what a great explanation to help people at many different levels of comprehension understand the the process and procedure of how the rocket engine works. !!!!!!!!
Love, love, love! You answered questions that have puzzled me for years.
And this is the kind of stuff I miss on TV, where you actually LEARN something. Thank you folks for posting stuff like this.
Seriously insane quality man, im just commenting for that great details
I flew high power solid propellant model rockets for years ..and even igniting solids is quite a science in having to balance temperature and pressure within the motor for a quick and efficient ignition and thrust build up.
Amazing Video, learned a Ton!
My gosh...after all "THIS".. imagine you have to throw a masterpiece away into space after 13 seconds of being GODLY PERFECT!
Sitting there watching Saturn 5 launches in 67 on TV i was 8 years old, at the time as a dyslexic kid (but didnt know) who did electronics and not football I always felt alone, different and lets face it I was the prototype geek! Now 58 years of engineering later I would never have dreamt that actually the world was full of like minded people that just wanted to understand and innovate. Tim I appreciate your skill in communicating the nuances of one of mans finest achievements and Mr Musk for the subject matter. Your interviews with Elon are truly heart warming displaying the delight of the nerd out details from both of you and you can trust theres an army of nerds out here with you all the way........nerds will save the planet!
I love how precise the times are and how they have to predict the sequences so the valves throttle properly to minimize hysteresis. I'm guessing these valves are either all electric or electrohydraulic operated. No other way to get such fast responses.
My thoughts (questions) too.
Bravo!
Honestly, this is one the best videos I've ever seen on ANY technical subject. My 86 year old dad is a retired rocket scientist (propellant engineer), and I've been a rocket nerd ever since I was a little twerp.
I say it's one of the best videos I've ever seen, because I found myself actually feeling nervous and tense during each "play-by-play" of interrelated variables and processes during the sequence.
This edge of my seat feeling happened repeatedly, because start-up is a balancing act on the edge of catastrophe.
Sure, I've seen some free-climbing videos (no ropes) that gave me the willies even worse... but dat not rocket science.
A tour de force of exposition 👍🏻👍🏻👍🏻
Man, this is maybe the best video you've produced- ever. I think you succeeded in distilling this complex dance down into something understandable by everyone. Thank you! A highlight was the RS-25 start sequence and seeing the engine chaotically manage through open-loop control into a smooth, closed-loop managed control. I can't help but wonder how much of this has since been tamed with the development of better sensors and faster computer processor speeds. A follow-up short video might be cool to show even how the RS-25 of today is started compared to when the engine was first developed in the 70's.
okay, a couple beers now and almost ready for bed: I came back to watch that startup sequence again, this time imagining myself as the shaft of the turbo pump. The amount of torque just given the inertial lag as the preburner hits prime must be intense!
This is a great video. So much efforts condensed in it. Thank you @Everyday Astronaut
All the comments here speak for themselves. You bring massive value to the world by doing these videos, not possible to measure.
Thank you ! Another great video, more PLEASE !
You really know your stuff. And present it so well. I am frankly astonished powering up is so complex. Well done.
Hey Tim, awesome video! For the RS-25 start sequence, at 50:25 CCV sits on the bypass leg, so as it ramps down and closes, it forces more hydrogen down the feedlines and through the nozzle coolant tubes
This is why rocket science is so hard. The sheer complexity of chemistry, metallurgy and engineering to make only a rocket engine. Don't even start with physics of orbital mechanics and gravity, ugh...