A4 / V2 Rocket in detail: Turbopump Part 2

[@martinda7446]

Good god! I've watched Part 1 ten times over the years. This feels like the glory days of BBC science and OU. Wonderful.

[@tocsa120ls]

there's a definite feel of Tim Hunkin when the simulated turbopump starts disassembling itself 😁

[@ericweiss8264]

Out of all the "part 2"s that took forever to be released, this is one of the best and most appreciated!

[@bobdalton2062]

This was absolutely SUPERB!! Well done, and worth the long wait! So much excellent analysis and loved the experimental aspects with gyroscopes and more. I will pass this on to all my fellow rocket enthusiasts !!

[@agranero6]

Curiously you said "and on June, 20th 1944 it became the first human made object to pass the 100km Kárman line" and I notice I was watching this video at June 20, 2024, exactly 80 years later.

[@GlutenEruption]

Ugh! I can’t believe I’m just seeing this now! I’ve been waiting for this part 2 FOREVER! So happy 🎉

[@miketango244]

The German technicians back then were incredible, they were geniuses.

[@PabloA64]

My God, this second part was worth waiting for! Outstanding presentation, Robert! I promise to watch it several times, like part 1

[@karlramberg]

Yay. This is one of my favorite KZbin channels. Excellent use of models, diagrams and archive footage. The way you present this makes every bit of the V2 fascinating. With proper explanation one can appreciate all the design considerations they had to make for this rocket to function. Hats off for your effort.

[@Mesaman4]

Please, please, please continue adding more insightful videos; can't get enough!

[@mikewhitcomb6558]

My first wife's father was a project manager on the turbo pumps for the space shuttles main engines. I regret that I wasn't more interested in the subject at the time, because I am facinated by it now, and I love your videos. Rocketdyne was literally right down the street from my house, and in fact we were on the same street, Canoga Ave., my house was 4430, RD was 6633. More than a few of my friends parents woked there as well.

[@lukashohoff4200]

Bro just doxxed himself 😂😂😂

[@fuzielectron5172]

​@@lukashohoff4200 lol😂😂😂 Past tense........

[@biplaneflights]

Without doubt, the Astronomy and Nature TV's channel on the design and development of the A4/V2 is the most well-researched and presented series of videos on KZbin. The comprehensive use of models, real artefacts, period film footage and design drawings to explain how the rocket worked is second to none. Simply superb!

[@sebastianaliaga5570]

finally! part 2!

[@Simple_But_Expensive]

The centrifugal overspeed trip is still used today. For instance a GE Frame 6 gas turbine generator uses a centrifugally activated weight mounted on one of the shafts of the accessory gearbox to trip a hydraulic valve and dump pressure to the normally closed fuel valves. With no pressure, springs force the valves closed, cutting off fuel.

[@charris939]

I can't believe this has finally come up in my feed! We're all a little greyer since the last instalment!

[@hansmeevissculptures8234]

Utterly fascinating , excellently produced and brilliant subject knowledge.

[@williamhoward7121]

It felt like Christmas was here when I saw this video posted. I love the first video and this I believe is even better. I wish I had had you as a mechanical engineering teacher! You have a wonderful mind for being able to present the examples that explain very complex mechanisms and how they operate. My sincere thanks to you!

[@roselima1741]

All right. I was worried something happened to him. We a have a refreshed v2 exhibit at the cosmosphere at hutchinson, kansas. His videos have helped to appreciate the display so much more. Thank you very much!!

[@RocketPlanet]

Thanks, and good to hear about the V2 exhibit. It depends on what you mean; something did happen to me, I got four years older and five minutes wiser, and we all lived through the strange and unwelcome period of the pandemic. But I'm still fiddling with old rockets, so in that regard... KR RJD A&NTV

[@Mr.Thermistor7228]

YOUR BACK!!!!!! holy moly im so excited to watch another one of your videos! I absolutely love watching every single one of your videos multiple times over! So glad to see a part 2, thank you so much for your amazing videos!

[@RocketPlanet]

Hi and thanks. We never went away, so maybe think about subscribing so you don't miss anything new. KR RJD A&NTV

[@tomlongbow]

Great Information. At 1.30,22 the drawing notes „verstemmt“ which would mean peened or pinned but not glued as you suggested. Thank you for sharing your knowledge. Near my hometown we have had several launchsites. Antwerp was the target from here. Thank you again ! 👍🏻

[@MaschTEC]

My own translation for 'Verstemt' would be 'clamped permanently with plastic deformation.'

[@Alexander_Sannikov]

how on earth was von Braun so ahead of his time?

[@ntesla66]

The answer to Mr. Edson's question is , Yes! PDE (Pulse Detonation Engines) and aerospikes. I love your videos! You're an awesome human being and a credit to the whole human race. Thank you for sharing your obsessions with us!

[@billukumawat5375]

I have been waiting for this since 2019. Thanks for making this .. currently watching live 😍

[@surf2257]

That was good, thanks, cant wait for next one. Still watching old ones when i need a refresh. 👍

[@maikvogel6632]

Thanks from Germany! Great Content and explanations!

[@RocketPlanet]

Hi Maik. Many thanks for supporting my work - I appreciate your contribution. Every donation like this allows me to go on producing high-quality content on a subject that I'm passionate about, and there is a lot more to say. Best wishes Robert J Dalby

[@6Diego1Diego9]

I love these episodes!

[@vincep1c156]

Very nice, thanks!

[@martinlintzgy1361]

I need to watch this at least a dozen times.😮

[@leeforsythgriffiths]

Awesome video…..thank you so much

[@jkneathery]

What a great deep dive into the technical bits of rocket history. Your use of simplified models make a complex subject much more comprehensible. Thank you for your hard work Mr. Dalby.

[@irvine40]

Fantastic! You really are an expert. Really enjoyed the level of detail you went into. Today’s mainstream tv documentaries are dumbed down. Thanks for taking all the time & effort to produce this

[@brentsrx7]

Yay! My favorite youtube video has a follow-up.

[@jackdaniels8898]

Love you in-depth videos. Thank for all the details and bringing to light the engineering challenges and how they were overcome.

[@kalle123]

Excellent!!

[@VytautasValaitis]

Great video!

[@ivoryjohnson4662]

Thank you for putting this together you have explained it in a way that an ordinary person can understand it

[@billynomates920]

yes. i thought that too. i have a mechanical engineering degree but was still fearful this would be far too advanced for me. instead, it was a pleasure to watch and a reminder that people who really know their onions can explain complicated ideas simply and not blind you with science unnecessarily.

[@Gold3nAng3l]

I hope this goes without saying, but I greatly appreciate your use of practical and understandable demonstrations to give insight to and explain complex phenomenon. While it's undoubtedly far more costly (both monetarily and in time) than throwing together a PowerPoint or write up, particularly for such a technical subject, your style of teaching/explanation is far more effective at both facilitating a 'true' understanding for the viewer while watching the video as well as (and possibly more importantly) retaining that understanding after watching the video. If I was the Royal Institution I'd be begging you to give lecture(s) for their KZbin channel! This content deserves far more exposure than it receives in my opinion, thanks for the great video and keep up the fantastic work! c:

[@RocketPlanet]

Hi there, you had me at Royal Institution! Thanks for watching, and please subscribe so you don't miss our next effort. KR RJD A&NTV

[@toma5153]

A fantastic and well-researched video. One of the best I've seen on KZbin. Congratulations.

[@Thompsonje]

I really enjoy the technical details you cover with the complexity of how the V2 was built. 👍🚀🙂

[@alphadog6970]

I have no words. Magnificent video 👍👍👏👏

[@pugnate666]

1:30:00 Verstemmen is an old phrase for a press-fit. Amazing analysis, thanks so much for putting in the time!

[@RocketPlanet]

Hi there and thanks for watching and commenting. As I'm sure you know, languages are living things; they drift with time. These days I always consult with more sources than Google and Deepl for translations, including native-speaker colleagues and of-the-era dictionaries. My oldest Cassel's German English dictionary was published in 1888 (old for us, not so much for them) and translates 'Verstemmt' as calking or caulked. And in this case, I think that's what the drawing/production office meant. The linguistic point could be debated at length, I'm sure. But the engineering point is that there is nothing to the part that needs pressing in place, whereas they did use a locking compound and screws to fasten it (the cement compound or glue was to eliminate the possibility of movement that might precipitate loosening). Thanks for posting. This is probably the only one of this type of linguistic/translation corrections I'm going to reply to for the time being - there are others and many more will follow, but I feel the above points adequately state my position. Again thanks for posting. KR RJD A&NTV

[@pugnate666]

@@RocketPlanet As a german engineer, the method of securing the part interests me greatly. The idea of using a cement or glue in a high vibration/high temperature environment sounded risky. But translating "verstemmen" as a press fit or securing the screw by denting the rim with a punch, would make more sense to me and be approriate for the era (as far as my limited knowledge goes). Nevertheless, I didn't mean to phrase it as a "Well actually ...". I genuinely thank you for putting the video together.

[@thomasgunther]

I wanted to point that out too. As an enginner, I never heard the term, I had to look it up. The German wiki says it involves plastic deformation. And the root of the word "stemmen" also evokes applying a force, rather than applying a cement, at least to a current speaker. I never would have thought to consult historical sources for that, but this seems to be the right way.

[@theonlymadmac4771]

German native speaker, mechanically inclined: verstemmen is exactly what pugnate 666 says: securing the position for example of a threaded junction by mechanically denting one part with a punch or a chisel, so that the parts cannot come apart. Correct for the period, where things like loctite were not yet invented ( or wouldn’t work anyway because of heat)

[@John-yf8qh]

Another beautifully put-together video about one of my favourite engineering topics. Bloody well done!

[@Xsiondu]

I just realized this is only a month old. God the times I've watched part one and wondered about part 2. I've never been more interested in pumps than i am right now.

[@Dennis-uc2gm]

Fabulous information, well worth the wait. I'm in awe of the engineering that went into that rocket during a time a war was being conducted and many other projects in the works simultaneously.

[@LEGOBubuS]

We, here in the Turbopump Lovers Fan Club were waiting for this Part 2 for long time.. 😊 Well done, again! 🎉

[@michaelhasson7072]

This video, and its predecessor, are simply tours de force of historical engineering documentary. Remarkable, Robert and colleagues.

[@MRmeanmagicman]

IT’S FINALLY HERE!!!! Thank you for all your hard work, that was absolutely fantastic! I learned a lot and your demonstrations are phenomenal. Keep it up, can’t wait for more content!

[@petersnow389]

Congratulations Robert, superb work. Many thanks.

[@hans-uelijohner8943]

Very impressive and interesting video!!!!! Great!! Thanks! Schnellschluss Ventil: schluss comes from schliessen, to close, so quick closure valve. Unburnt cooling fuel can very nicely been seen in the Saturn 5 footages as a black shadow.

[@6Diego1Diego9]

Guidance and control is going to be so interesting

[@felixd1127]

Brilliant demonstration and explanation. All thumbs up 👍 Greetings from Germany

[@aaronsmith2098]

Thank you for yet another amazing video.

[@robertbl22]

Thanks!

[@RocketPlanet]

Hi Robert. Many thanks for supporting my work - I appreciate your contribution. Every donation like this allows me to go on producing high-quality content on a subject that I'm passionate about, and there is a lot more to say. Best wishes Robert J Dalby

[@chrishyslop1]

Fascinating, I was glued . Great work really well explained. Thank you.

[@darioarzela1983]

I would love a book collecting those blueprints he shows!

[@martinda7446]

At a few mins in I wondered about two pumps running in opposite directions one for oxidiser and one for fuel. Would that work?

[@Alexander_Sannikov]

a 2 hour video essay on turbo pumps? yes, please

[@BK-uf6qr]

A gripping video. I really can’t say enough about it. I’ve watched all the “V”ideos and they’re fantastic

[@sailwesterly5444]

Your practical demonstrationskills at the bench are quite excellent in explaining things.

[@nikoscosmos]

That was excellent! The sound track was amazing...

[@charliebravo8622]

Just fascinating!! Can’t wait for next part!!!

[@lukashohoff4200]

Should be out 4 years from now 😂😂😂

[@charliebravo8622]

Absolutely worth waiting

[@sheep1ewe]

A massive thank You for making those videos!!

[@tracysrocket]

Robert, super results. I know how much work one of your productions requires and I must say that you outdid yourself. Your humor spots were not lost on me either! -Tracy

[@RocketPlanet]

Thanks Tracy, I cut out the piece with 'Artful Dodger' as a short as you suggested. You can see it here: kzbin.infonInEYVR5U4Q KR Rob

[@Boyracer73]

Incredible amount of detail and knowledge! Thank you so much 🙂

[@GreaTVidsMedia]

Wow, fantastic documentary video again. Thank you Robert!

[@mikedrop4421]

That's incredible. I never considered the gyroscopic effect turbo pumps and fuel pumps would have on a rocket. It's extremely obvious now that you've said something. Can't wait to watch the rest of the video to hear you explain it.

[@Aengus42]

Google the "Titan II screech"! It has to be my favourite spin up sound from the turbopumps at launch. It heralded the start of every Gemini mission 🚀

[@catallaxy]

Amazing documentary series. I can't turn it off!!

[@Luetth73]

First of all , a very detailed video - thank you 39:02 Schlagring - the word "schlagen" in technical view also means something that rotates out of center or out of balnace. "Schlagring" means a ring that rotates out of center.

[@theonlymadmac4771]

Schlagring in this content translates to oscillating ring. No humor involved, sorry😂

[@h0lx]

Thank you so much for this! Mind blown multiple times! Seriously considering becoming a patron!

[@n6mz]

1:21:44 this entire segment kept whispering in my cerebrum "aerospike ... aerospike."

[@pythosdegothos6181]

What a pleasant surprise I got this morning seeing this video in my to watch. You do such a fantastic and throurough job in explaining how these machines worked...and yea, that sound of the turbopump spinning up does sound like a wild beast. I have zero doubt that creature in the clip was "voiced" by that V2 at White Sands. Also though, a similar sound is heard from the Titan II engines as the spin up for the Gemini fliights. Again, great video.

[@John-zo4wu]

Awesome, excellent presentation! Thank you!

[@miguelmouta5372]

Congratulations for this great instructional job you did!

[@peterbustin2683]

These are great videos and an important aid to teaching.

[@edschaller3727]

Thank you again for great information presented in a way a layman can understand!

[@glennmorrissey5309]

Another great expose of the V-2's turbopump.Superb!

[@andrzejkawa5491]

thank you god only knows how I waited and hoped for pt2!

[@8710ify]

I have waited for this for so long! Thank you!!!

[@dayradebaugh]

Very nice demo with the balloons. Effective presentation.

[@dingolovethrob]

fabulous video

[@Helicopterpilot16]

This kind of material would've been wonders to watch when I was a child. When I was a child in the 2000's, it seemed most technical stuff directed towards children was unsophisticated. Don't get me started on the NASA channel. Your work in regards to the V2's details and the science behind it is a breath of fresh air! P.S. Can you make a short of the turbopump sound? That alone gave me chills and a nervous laugh/cry.

[@fahriakbas8156]

Fantastic work!

[@OYEUAV]

I don't even know what to say... Here in Africa 🌍 getting ro see a rocket is like a journey to Jupiter.. let alone understanding the physics and operation of one 😢. But i love it and the only one who is helping me is you. God bless you in abundance and please if i can chat you personally it will be a dream come true. Thank you and more blessings

[@blackhawkorg]

Superb presentation. Thank you.

[@ProfessorMAG]

So they accidentally created the worlds first aerospike engine that worked as an afterburner!

[@JimWattsHereNow]

This is absolutely wonderful, thanks so much for doing these.

[@jiggsborah7041]

I'm a diesel mechanic and I really enjoyed this although I keep getting disturbed by the family and have to go back time and again and I guess it's helped me a great deal because playing around with engines basically involves improving combustion and increasing efficiency and getting better stoichiometric efficiency. The scale of the processes are quite staggering though. The quantity of fuel and oxygen going through the system is staggering to me. Thanks for your excellent explanation and I'm subscribing to this channel and will check out your previous posts because this subject is very interesting.

[@hirnlegorush]

Superb content my good sir :) when are you going to build a 1:1 replika ? start NET ?

[@GlutenEruption]

Wow, that exhaust spectrum at 1:02:53 is incredible! The heavy sodium and manganese lines from the Sodium Permanganate outshine everything, but it’s so cool to see the light potassium line at the top (probably from minor potassium contamination in the permanganate) and probably the most interesting of all is the bright calcium oxide line - where did it come from? The fuel was 75% alcohol, not anhydrous so they didn’t need to dry it using CaO, did they dilute anhydrous alcohol for control or purity? So interesting

[@AlainVanhove]

OUTSTANDING als always !!!! LOVE it :)

[@lugnutdecepticon]

Another great video on the V2! I would love to see you do a video on the A4B version!

[@charliesk1]

Another amazing video, thank you!

[@johannesdesloper8434]

I really like your videos, I think unique in it's kind. Like all the modeling. A rocket always rotates around it's Center of gravity. Sometimes model rocketeers also do a swing test to see if a rocket is stable. They put a string in the center of gravity and swing it around and see if it flies forward.

[@bibia666]

The turbopomp screams: POWER! In a rather screechy voice..., kind of eerie too.... Greetings bibia. Ps thanks for the uploads, I liked.

[@charlesblithfield6182]

Awesome production.

[@reverend1989]

Awesome video, though "schnellschluss" should be translated fast closure or even better "quick Closing". Schluss can also mean end or ending in General, but not in this case. Looking Forward to more V2 Videos.

[@Luetth73]

"schnellschluss" means emergency shutsdown

[@ClausB252]

Brilliant explanations and demonstrations! Is your mobile museum still open?

[@petermertz9175]

Very catchy explanation how this machine of "Hein" has worked. Best wishes from Frankfurt, 60km distance to Frankenthal.

[@martinbeverley9536]

At abt, 1:19:00, increasing the combustion chamber pressure would reduce the pressure differential between it and the fuel/oxygen injectors, thereby negating any additional thrust generated.

[@RocketPlanet]

Hi Martin, that's an interesting observation, and I don't have an answer for it either way. Nothing on a rocket engine happens in isolation. I don't think the writers of the report (Edson et al) really got into the exact calculation of the cashbook profit and loss of the effect - at least not that I've been able to find anyway. Now that H2O2 thermal reactor steam plants have gone the way of the buggy whip, and as most of this technology theory was really based on practical trials - proving it one way or the other may have to wait. Thanks for posting. KR RJD

[@mdesm2005]

I don't see how increasing the external pressure helps develop more thrust. How could more back pressure help the gases exhaust faster?

[@topspeed250k5]

I thought the same & have posted a long comment to say exactly what you put far more concisely. It doesn't seem right at all.