Another superb video. No need to apologise for your accent, a lot of studies show that this will actually improve the listeners comprehension, as they need to concentrate more to understand every word. Although familiar with some of the technical details that you described, you produce a very coherent explanation, with superb video selection and editing. Thank you!

oh finally i like these technical details

This was fantastic! The many hours of work really show. Bravo!

Wow! You weren't kidding about doubling-down on content! So much good stuff!

Hands down the best rocketry related video on the internet! Truly a work of art :)

This is the second time I watch this, the first time I watched it in French. Very conclusive and diligent, I learned a lott watching the English version because my French isn't quite good enough. You really achieved to fabricate one of the most elaborate KZfaq videos I've seen and there are many.

This video was so good that after seeing it SpaceX called me to give me a job as a rocket expert. Thanks a lot! French Space Guy.

Dear Sir, Allow me to complment you on your english. You do quite well for someone who has this as a second language. I am really commenting on your videos. I have been interested in this, but had no real way to even formulate intelligent questions about it. You have explained it all very well. I may not understand all of it, but I can grasp the outer edges, as it were. Fortunately for me, my husband is an engineer. And he is subscribing to your channel. This, from what he has told me, is a life-long passion of his and he is grateful to you giving me a way to understand it. Thank you so much.

This is so excellent! Thanks for the hard work on this!!!

This is the kind of educational content the internet was made for. I learned a lot between these two productions. Thank you!

Your accent is very enjoyable to listen to. Your explanations about rocket motors and their exhausts was fascinating , and even more enjoyable to hear. Thank you for all your hard work producing these videos.

Absolutely stunning, just what I needed after a long exhausting day. Something to completely engulf my brain in fascinating detail and so wonderfully presented. The music was great and just added to the awe. There is something so majestic and otherworldly about watching a rocket in the upper stages of the atmosphere. As for your accent, I could listen to it for hours lol.

the devil is in the detail ... diabolical production indeed :) thank you very much for your excellent effort, I will guard this treasure in my memory

That was really great, you answered a whole bunch of questions I didn't know I had, top work!

To have so much technical information in only two 30 minute videos while making it very interesting, and keeping my attention the whole way through is amazing! Thank You!

Absolutely excellent. This video has explained and answered a lot of questions in my mind since I was a child.. I'm now 64, and I will keep learning as long as you keep explaining. My last 3 years work was building satellites for SSTL, so I have a great interest in the subject. Thank-you!

Keep making these, they are good! No need to apologize for the accent it is quite intelligible

I Thank you immensely for these masterfully done videos. You sir are a treasure. Again, your accent is of very little hindrance and you clearly articulate every word. Living in Ireland I don't get to witness these spectacles of human achievement, but one day. Your content should be known far far more than it is, and I will gladly point anyone I can in your direction. Thank you so much.

You Sir, are one hell of a man!!! You have done what no one has done!!!! This here is THE BEST video of Rocket engineering I have EVER seen. Your technique in both film and narration is phenomenal!!!! Thank you from the bottom of my heart(and top of my brain) ;-)!!!! keep up your professionalism, it is truly a joy to watch!!!!

Thank you! I always thought that diamond that forms a hundred or so feet behind a multi engine rocket at high altitude was a macro scaled mach diamond. And I couldn't help but smile every time you said "Ydrogen.

Thank you for creating this two part talk. Thank you for existing. Please continue.

Keep it up, man! One of the top quality KZfaq rocket education videos. Sincerely thank u for this fantastic material !

Congratulations Sir, 35 Minutes of outstanding technical commentary! You clearly did your homework, research, and know your audience, Kudos.

12:35 Just remember that the Saturn-V rocket shown is 363 feet tall. Those are some very, very long rocket plumes. We are watching 3,357 US gal or 28,415 lbs of propellent being converted into 7,900,000 pounds of thrust every second. Simply amazing! Great videos.

I've only just found this channel, and this video blew me away - very polished, well paced, excellent editing, and amazing enthusiasm and explanations

A brilliant explanation of a complex subject. So easy to understand

I only just discovered this Channel and is 04:00 Keeps me watching again and again This is wonderful!

Wow! Loved the first one, so you set the bar high. But the second did not disappoint. Lots of very detailed information, but at a pace and style of explaining that made it very easy, and engaging to follow. Even though it was long for a KZfaq video, I did not want it to end.

Absolutely fantastic.

Deeply interesting and artistically beautiful! Thank you. And it wasn't long before the accent seemed to disappear and every word was easily understood. Magnifique!

Keep them coming! Excellent detail!

Magnificent video - thanks for the hard work in creating this

Wow wow wow! This video gave me goosebumps and taught me things I didn't yet know. IMO clearly among the best videos on YT. Ever. Out of all the topics. And this is coming from a liquid propulsion engineer holding an MS degree on the topic.

amazing!!! keep posting!!! you are covering the things other youtube channels have missed out completely!

Really fantastic video.

Great overview have always been fascinated by this.

Astounding! Superb video. I was engulfed by your commentary and have learned so much. Many small details ( I have wondered what they meant since I was a child, over forty years ago) have now finally been explained. Thank you Sir.

Congratulation frenchman! You cleared the tower. Lets go in, to the next episod, in your launch program.

This is the best explanation of this subject I’ve come across. Great job being clear and concise. A+

Excellent job. You cleared up a lot of what I observed in space launches since Gemini!

Moi qui suis francophone, j'ai tout compris :) Blague à part, superbe travail! Félicitations!

excellent content, thank you. thanks for stabilizing all of the videos.

To confirm everything: The pressure increase as space diamond is created, so there is a lot of space diamond, that is mig disk. So, there is a series of mig disk which the bottom part is higher pressure as forward V narrows, then go to next mig disk, so all those mig disk is design to hold itself in atmosphere, so the mig disk can expand as forward V expand, and at same time it narrows or further to base line that is nozzle. So, it is about balance, so the lower balance which in higher atmosphere as pressure decrease so the pressure of mig disk increase and at same time the inward fire go upward which can cause damage to rocket, so there is a barrier, or no barrier but a separate. So, separate is necessary than a barrier which the rocket can keep going. The separate part is 4 engine that is beyond the main engine which separates the main rocket, so it has retro braking which engine itself can increase or not as to goes down which the thrust upward to go down, so it can be controlled to the land down. Upper level, there is a curve line of fire upward, but can alter to go downward. What look like explode is a barrier that is separate of rocket which bottom part will go down to prevent inward fire to go upward and damaged it. So, the color as it goes up to change from opaque to clear. So, opaque can be high heat, and clear can be higher heat. So, which it is connected to mig disk that is higher opaque at a lower level to higher level that is transparent. So, the fuel is a cause of the fire which causes higher thrust, so burn gases so the fuel can be in a different color. The inner is dark as fuel and outer is regular fire to interact so it burns the inner to cause thrust?? There is a link for two thrusts. So, there is no explanation of why cold oxygen is need as fuel? I get it for water as a damp to sound for preventing to rocket. How fast does rocket go base on thrust weight which it is more than 100,000 lbs, to equal how much the weight of a rocket? What is the thrust weight / rocket ratio? The injector fuel, then first thrust to the second thrust, but saw no color. So, the color depends on what kind of fuel right? So, booster thrust is a fire to interact with injector which causes the center thrust to go up with fuel. Well, can you explain it clear? So, there is three processes that are gases as first, to two thrusts which is fire and fuel, so the second is fuel and third is fire?

Fantastic information - now I understand much more. I was very interested throughout both of your Rocket Flames videos (your English is very good too). Appreciate all of your hard work on this - Cheers from Seattle!

Thank you so much for your hours to inform us about these things..

Wow, really in-depth and helpful. High production quality too. Incredible work!

Wonderful video. Such great detail and depth on the intricate beauty of space launches. Amazing footage too. The accent is a plus IMHO!

So enjoyed this video, I think I will watch it again as there is so much to absorb

This was fascinating, you explain things very clearly and your accent isn't a problem at all.

Really good videos, doing great. The accent isn't really a problem. I think the only thing I didn't really catch at first were the Mach Disks which at first sounded like mag disks which made no sense. But great insight into rocket exhausts, loving it.

Superb presentation... so much amazing footage and perfect delivery.

A superb compilation of fantastic footage! Thanks a lot for your efforts!

Thank you for all your effort making these videos! The attention to subtle detail, the sensitive music choice, and the clear explanation of the physics comes together in a very high quality production. Thanks to the noticeable effort to pronounce every word well and understandable, only in a few moments are subtitles a little help, and even then every word is worth the attention. A truly unique and wonderful take on this topic, that deserves thousands more views.

All the footage is spectacular. What really surprised me was the inside of the liquid oxygen tank. Your videos are relly unique and educational.

I love your accent. I'm glad you speak English at all :)

Really great work! Beautiful video backing your explanations, much of which I've never seen before.

Awesome work across the two videos. One of the best YT videos I've seen in a long while. Subscribed :)

Thank YOU! Thank you thank you! I love your in depth discussion about all the phenomenon Ive been interested in since I was 7 years old. The flames at the bottom caused by the turbulence, the flames extending up the sides of the Saturn and how the injector dome assembly creates a pattern in the exhaust at high altitude. Absolutely fascinating and in depth explanations.

wow, how have i not found your channel before loving rocket building & space as much as i do, an outstanding set of video's, thank you, i hope you get around to making more.

Another amazing video. I love the technical deep-dive. Your accent is not at all a problem. You speak excellent English, as I'm sure you know.

Fabulous, really interesting. Thank you. More technical the better!!

YOU ARE FANTASTIC,I LOVE YOUR WORK MAN

Man, the separation events on those early rockets got so complex. Even the separation motors had a separation event before they fire.

Lovely video! Once you mentioned the plume impingement of the Saturn IB, I knew you had to talk about the Falcon 9 first and second stage fighting against each other. Excellent footage, and wonderful explanations!

Great video. Worth the wait.

Amazing video. I knew some of this, but still learned a lot. My favorite phenomenon, which was not covered here, is a few seconds after takeoff. It's not always visible, but when the turbulent section of the rocket plume is passing by the tops of the clouds of vapor from the launch pad deluge, the rapid pressure changes can make bits of the cloud flicker rapidly in and out of existence, as it vibrates around the dew point.

Glad I stayed subbed!

Fascinating video as well as part 1. Liked both and subscribed. Thanks!

This was fantastic!!

Found your channel referenced by Scot Manley, incredible work, please continue with such in-depth explanation videos.

WOW! good work man, good explanations and images.

Tres bien gars d'espace Francais! Great content, well explained.

Thank you sir!

Really good, and informative. Thanks a lot.

How in the world does this have so little views? Great content man.

Awesome presentation.and thank you for listing the sources!

thanks to you for this masterpiece.

Finally! Here we go! :D

Great job! I enjoyed and learn a lot, thank you

Magnifique!

Outstanding video. Really fascinating stuff

Incredible video! Subscriber 4ever.

Great video. At times it could have used a tiny slow down on the dialog. My wife watched these two videos with me and said that the last guy, Curious Droid, was easier to follow because of the vocal pace. It wasn't the accent because she learned French in high school.

Nice work on both videos in this series! You are easy to understand, don't worry about the accent.

Thank you so much! Now I know things about rockets that I didn’t even know I didn’t know.

That was awesome... That is all I have to say

You made it, finally. Congrats :)

Nice work!

Thank you for this excellent video!

fun fact: the Soyuz third stage fires while the second stage is still running, which removes the need for ullage motors

Amazing, so much detail, as you say "exhaustive" ;) Do you have any idea what the exhaust will look like for the Starship and Superheavy vehicles? These have some engine configurations we've never seen before.

VERY LITTLE TECH... EXPLAINED BY YOU !

nicely done and well illustrated and for some reason my thoughts now have a french accent

Wish you had more subscribers.

great video, you are impressive. thank you

Bravo!

Excellent !!! More More More

Heck yeah, man!

Excellent!

Wow that’s awesome again!