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A comment for the algo. Becuase you deservice it Tim!

Tim, I like that space suit. Though this video was done 4 years ago, you should wear it more often

Stirring the tanks….Apollo 13 will recall😜

Talking about cavitation, bootstrapping and start transient, why not use a Tesla Valve for controlling this process?

I was waiting for this video so long, how to break the egg-chicken syndrome, now I know it.

My high school was right down the canyon from JPL in 1957, and now I know why I kept hearing roarrRRRBOOM.

3:51 its like blowing on the moon to make it further away, too weak

horse... power...

liquid fuel rocket engines are even awesomer than turbojet engines!

Imagine telling your insurance company that your car got destroyed by a rocket

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!

This is great material. My knowledge of gasoline engine controls is almost directly applicable to rocket engines. They're incredibly similar even down to the closed loop fuel controls.

Speaking of pumps… I’m PUMPED to see you orbit the MOOOOOON 🤩❤

Listening to Elon try to explain cavitation makes my ears bleed. Like bring a knife to a gun fight he is. Also, oxygen rich environments is a massive ticking bomb. Just a technicality from your explanation on cryogenic fuels and oxidisers.

big respect for that extremely brief intro

I'll take SLS any day!

I think it's fascinating the way the rockets land, I remember many years ago watching the apollo on the moon missions with my dad, he would be overwhelmed if he was still alive to see what Spacex have done with space travel. Truly amazing

I don't have some fancy comment to gain attention but man...... Thank you so much for making this channel. I look forward to watching many more videos. How to start these bad boys is next. 🚀👍🤣

Having watched your other rocket engine videos I knew the startup sequence was tricky, and wow all this on top of everything else that makes rocket engines complicated. Good thing Elon has the very best engineers, he needs them. No surprise B.O. is having issues.

With the 4th Industrial Revolution, I believe that there will be innovation in the creation of new energy induction motors for eternal batteries and now would electric induction rotors be where would the batteries of new Aerospace transport vehicles be?

Thats way,

That heat shield design is so cool! I heard him say they’d use cryo as the coolant and (As someone who’s studied aerospace engineering) I immediately shouted “Why didn’t I think of that!?” It’s such a cool and novel system and the company really made a good decision contacting you to display their stuff. Thanks for the awesome vid! -J

Thanks for this, always wondered the type of profile that lead to a position there

Thermal conditioning for cryogenic propellants... This is one reason why China like hypergolics so much. Cos they care more about their engine components than they do their own citizens.

Pascal is like when u say I am preparing chopped veggies and idiots call it crudite. I used to be so intimidated. Lol. I wished I could b so fancy and make it. Then it was simply chopped vegetables. Sad these.

It’s all ways weird me away it on why blue origin is so quiet about what’s going on unlike all the other western space companies, any idea why ?

One pair of facts that took me a while to really "grok" is that the fuel flow pressure must exceed the chamber pressure, which is driven by the combustion; and that back pressure is simply a force that pushes the injector plate and the nozzle, that either directly or indirectly pushes the thrust puck and rocket body "up". The combustion process is just the mechanism to provide the push. I know this is obvious in one sense, but it's interesting to think of it as hypothetically capable of being implemented by any arbitrary mechanism such as a piston or large fist (for a short distance!).

wow, building rocket engines are way easier than anticipated.

Moon boy! I..... could not do that. I hope you know how incredibly proud we all are of you!

We live on the shoulders of giants. But Elon is a giant that walks among us.

28:18 I woulndt want Warren Buffet's job either... Probably the closest thing to playing bingo for billionares😂😂😂

11:56, question, couldn’t you make some sort of system where you expand the nozzle? Just like on fighter jets, but then instead of closing exhaust, you lengthen it. Or is that just not useful enough because you stage too fast for the system to affect the efficiency?

Listened to this while I was standing on max brewer during Artemis... thank you

Wow this channel finally streams a launch 👏

Thanks for the great content!

Very few interviewers are knowledgeable enough to ask the interesting questions like Tim does. V-e-r-y f-e-w.

Great video as always but Ullage thrusters, u lost me, how do they force the fuel to the intake and remove the bubbles / cavitation. Can any one help?

This is so informative--I actually feel smarter.

So many questions answered! Awesome video Tim! I'm glad I was finally able to watch this

I think I might have to watch this video more than 3 times

i wonder when space x will try to land on the vab

Matt Lowne does not approve of this video

How to light a rocket engine - whit a big match! Duh

Thank you Tim and Stoke Space Team Brilliant report Stuart in Ireland ☘️

14:18 “If the tiles bang each other” -Elon Musk 2021

would SSTO's be viable in combination with Kurzgesagd's orbiting spinning thether

The V2 rockets were fueled by a mix similar to vodka

We just need R.A.P.I.E.R. engines

perfect video

This need for helium to purge a hydrolox engine, would this create any issues for hydrolox rocket engines on the Moon? It's not exactly easy to access helium there, at least in quanity, even Earth may have issue with the supply at some point.