Dissecting a V2 rocket steam pot

Рет қаралды 16,409

Күн бұрын

We continue exploring the A4 / V2 rocket in detail, and in this video, we dissect a real steam generator used to drive the missile's steam-powered turbopumps. The relic was discovered in Germany a few years ago and recovered from a ground excavation in a very rusted condition. We look briefly at some operations to preserve the relic and prepare it as an educational exhibit. Robert looks at the construction, exploring the history and details of its function along the way.
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00:00 Introduction
00:19 Explaining this video
00:55 Recap of Turbopump Part 1
01:59 How the relic was found
02:41 Dissecting the relic
04:51 Removing the head nut
06:08 Exposing the valve
06:58 Exhibit explained
10:05 Main and pilot valves removed
11:38 The hole in the funnel
12:11 Hole in drawings
13:05 The 'Helter Skelter'
14:58 HS 293 rocket engine
17:09 Thermal reactor problems
18:16 Valves disassembled
22:26 How they functioned
29:58 Spot the difference?
30:37 Thanks for watching.
Followed by end credits.
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Presented by Robert J Dalby
Produced by Astronomy and Nature TV

Пікірлер: 88

@BartJBols 10 ай бұрын

clicked faster then a turbopump turbine can fling out of its housing.

@randysmeltzer6891 10 ай бұрын

Many thanks for the effort you have installed into these videos, my technical addictions satisfied manifold with every installment. (Particularly turbo pump part 2, worth the wait). Your attention to detail truly commendable.

@Aengus42 23 күн бұрын

11:00 Wow! That stainless sprung valve looks factory fresh! Absolutely stunning!

@staffanadelqvist4130 10 ай бұрын

Amazing! another of my favourites! V2 explained.

@clavius5734 10 ай бұрын

Thanks for also showing the preparation of the exhibit, that was very interesting to watch as well.

@ericrichardson6793 Күн бұрын

I was fortunate enough to buy a second hand copy of a German book many years ago, about Peenemunde and the various fails during the design schedule for the V1 and V2 weapons, so this series is fascinating for me..thank you !!

@AbuctingTacos 10 ай бұрын

Best series on KZfaq. I love how packed with information this is

@MrTylerStricker 12 күн бұрын

Well i will say that at least watching this series has taken away my default chuckle every time i see a picture of von Braun and a rocket together

@c1ph3rpunk 10 ай бұрын

I had no idea I wanted to deeply understand how a V2 worked, but it turns out I do. I remember building a V2 model rocket when I was like 12, had to be like 1981, and loved it.

@gtkrk9539 4 ай бұрын

Excellent. Those subtle changes of the valve are the essence of engineering... To achieve perfection a myriad of wee adjustments are necessary... Thanks!

@Things_Green 10 ай бұрын

A brilliant series of fascinating lectures. Your passion for the subject matter shines brightly. Thank you.

@robertbl22 10 ай бұрын

Robert's presentation style reminds me of the beloved "Connections" series by James Burke

@ntesla66 10 ай бұрын

A "Turbo-Encabulator" with "Spurving Bearings" lol , just kidding! Thank you so much for continuing this series with such detail!

@RocketPlanet 10 ай бұрын

Hi there and thanks for posting. I would have covered the use of prefabulated aluminite but there wasn't the time. KR RJD A&NTV

@sheep1ewe 10 ай бұрын

A really massive thank You for making those videos!!

@tomstrum6259 7 ай бұрын

Lots of Comprehensive & detailed Info here !! .....Some dry Ice shaft Chiller + Focused torch flame or Spot induction Heat applied to Nut would likely have easily broken Loose the Nut threads.....

@pythosdegothos6181 10 ай бұрын

Another terrific video on this machine that would lead to the moon.

@BK-uf6qr 10 ай бұрын

Thank you for taking us on you’re Journey with you!!! Amazing, fantastic. Best video on KZfaq.

@foobar201 10 ай бұрын

Awesome presentation! I love that you dive in all the way on the topics that usually get glossed over

@mohammedalmukhtar5428 10 ай бұрын

Fascinating is understatement….one of the most beautiful presentations you can land on KZfaq!

@PabloA64 10 ай бұрын

Great, amazing description!

@bobbysenterprises3220 10 ай бұрын

Another great video. I would love someone to see someone make a model of this and film it with inert fuel in slow motion. Or even do a good computer animation of the flow and mixing

@isaacplaysbass8568 10 ай бұрын

Fascinating to see how well preserved the valve assembly was.

@itsmyview2024 10 ай бұрын

The rocket mouse pointer is genius

@dingolovethrob 10 ай бұрын

truly superb analysis

@hxl6162 10 ай бұрын

Perfect your outline and details as usual

@benwinter2420 10 ай бұрын

Are you an bot ?

@hxl6162 10 ай бұрын

@@benwinter2420 No, but I think you are

@n6mz 10 ай бұрын

Excellent!

@jimknowlton342 10 ай бұрын

WOOOOOOAHHHHHHHHHHHHHHHH BACK TO BACK LEGENDARY VIDEOS

@Blindbrick2 10 ай бұрын

4:16 'Asbestos gasket'. We still used that stuff 35 years ago.

@mikus4242 10 ай бұрын

Fascinating!

@LEGOBubuS 10 ай бұрын

Finally.. ❤🎉😊 Well done again!

@robertbl22 10 ай бұрын

A cool revelation at 17 minutes!

@jtveg 10 ай бұрын

Thanks for sharing. 😉👌🏻

@BerndUlmann 10 ай бұрын

Wonderful!

@mcr1redpearl 10 ай бұрын

excellent - as usual.

@alexwild4350 10 ай бұрын

Fantastic series, love it. Eventually of course, we are going to get to the point where the only thing left to do is to crowd source the funds necessary to re-manufacture all the parts and fly one. Well that's probably ridiculous to suggest we fly one. To fly two or three would be much better.

@RocketPlanet 10 ай бұрын

Hi Alex, and thanks for posting. Well, some Canadians have already tried it, over twenty years ago. The ill-fated Canadian Arrow used pressurised tanks rather than turbopumps, but otherwise, they copied the V2 engine pretty faithfully. Though quite why they did something so oddly anachronistic is a different matter. Walter Thiel, Peenemünde's chief combustion expert, declared shortly before he died in 1943 that they would never build a rocket engine like the A4 power plant again and regretted many of the missteps that took them to the necessity of flying the 18-prechamber engine. So quite why the Arrow team thought it was still a good idea just two decades ago escapes me. KR RJD A&NTV

@andrzejkawa5491 9 ай бұрын

Thank you so much

@nwekuy 8 ай бұрын

very interesting! about the 8 ton and 25 ton valves, how i interpret the physics; the 8 ton valve opens before the 25 ton valve, at somewhat lower pressure, and also the reaction of H2O2 with the permanganate in the cup near the splash plate, invigorates the turbulence and reactivity of the permanganate, improving mixing and reaction with the H2O2 of the 25 ton valve, and reaction in the rest steam chamber. a kind of two stage reactor, of which the "first stage" is fed by the 8 ton injector. the kegel valve does the same thing as the ball valve in the 8 ton valve. less good probably (or some reason they changed it).

@TonboIV 20 күн бұрын

So my analysis of the subvalve is that it must open before the main valve and close after the main valve. That is, any time that the main valve is open, the subvalve is also open. The main valve is opened by a pressure difference. The pressure on the upstream side of the valve must exceed that on the downstream side by enough to to produce a force which overcome the spring pressure, and this pressure difference must be maintained to keep the valve open. Once the valve lifts from its seat, the pressure does not equalize, because this would destroy the pressure difference which is holding the valve open, and the valve would close. Rather, the annular gap between the valve and the seat acts as an orifice which has a pressure difference across it. The more the valve opens, the larger the orifice and thus the less the pressure difference across the valve and the less force there is available to hold the valve open. This system will naturally reach an equilibrium in which the orifice created is just wide enough that it maintains the amount of pressure upstream necessary to hold the valve open. Because the pressure difference across the main valve does not equalize, the subvalve will still be held open even once the main valve opens.

@ClausB252 10 ай бұрын

A Walter H2O2 engine was also developed for U-boats late in WW2 ! Correction: the Walter U-boat engine was developed before 1942, and before the aircraft and rocket engines. Source: Cremer, U-Boat Commander, 1982, English translation, 1984, p. 192. Wikipedia says Walter patented the design already in 1925.

@hosa-8210 10 ай бұрын

Sehr schöne Zeichnung von diesem Dampfmischer, und diese vielen DIN-Normen. Ich liebe solche Sachen. Greetings from Germany.

@typxxilps 10 ай бұрын

this is part 3 of the Turboprop series called beyond the Turboprop: the steam pot

@hu5116 10 ай бұрын

Marvelous video as always! So I would like to make three related comments. 1) I think it makes sense that the ball valve would be a pilot valve for starting the reaction at a lower flow rate to heat up the reactor, and prevent an explosive ignition, like can happen in rocket engines on ignition. I also wonder if the ball valve might not be a flow regulator during the burn, because the hydrogen peroxide and permanganate gas pressure must reduce overtime, but you would not necessarily want to reduce steam production to the turbines until you are ready to shut off the engine. The flow rate might have been kept up even with lower gas pressure by the opening of the ball valve. 2) since you have a pristine working model of the valve complex, and you also have the drawings, you should be able to measure the spring constant of the springs and then model the entire valve assembly in a suitable hydraulic simulator, which of course the Germans would’ve died for a 1940, but we have those today. 3) taking that one step further, since you do have a pristine valve assembly, why not just test it with high pressure water and suitable instrumentation and just see what it does? That would resolve the debate pretty much once, and for all I should think. Thanks for all you do!

@wernhervonbraun3985 2 ай бұрын

Perfect !

@Sgtklark 10 ай бұрын

Thanks!

@RocketPlanet 10 ай бұрын

Hello Dennis, and any 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

@OYEUAV 10 ай бұрын

Good work my teacher

@hplucio134sp9 10 ай бұрын

Your engineering history channel is great, I ask you to please include subtitles, thanks

@Pamudder 10 ай бұрын

The technology behind these parts is fascinating-- I have always found the turbopumps to be the most interesting parts of a rocket, and I am also an old steam hand-- but, of course, the history behind the A4/V2 includes tens of thousands of slave laborers worked to death at Dora Mittelbau and elsewhere. Were these sub-assemblies built by slave labor?

@mdesm2005 10 ай бұрын

if it's OK to paint it, maybe it's also ok to putty fill the rusted out dimples, for a smoother finish?

@cf9870 10 ай бұрын

Is there somewhere I can purchase the 3d printable files for the V2 engine and rocket that you use? Love the content and thanks for making these!

@midi5581 10 ай бұрын

Great video, just one small comment: Permanganate is an oxidizer here and hydrogen peroxide is being oxidized and not reduced.

@androidemulator6952 10 ай бұрын

I love this "Touching Actual History" - part of an actual V2 rocket - maybe have been launched and crashed- exquisite !! - thank you ! . Pit me on the mailing list for any "spare" V2 parts ;)

@Bystroushaak 10 ай бұрын

Thanks

@RocketPlanet 10 ай бұрын

Hello. 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

@hansmeevissculptures8234 10 ай бұрын

Total slave to your excellent videos.

@sheep1ewe 10 ай бұрын

And so am I...

@6803U4 10 ай бұрын

If the h2o2 is pumped into the main valve at around 450psi and the reaction is creating steam at around 400psi, then the valve is going to be forced closed due to the spring pressure and valve surface area ratios etc. The smaller pilot valve could be a way of keeping the reaction stable by constantly allowing h2o2 to flow rather than having an oscillation of the main valve as it bounces open and closed causing the steam to pulse?

@RocketPlanet 10 ай бұрын

Hi there, and thanks for a good observation. Even if the psi pressure on both sides of the valve was more or less equal, the force (not the same as pressure) acting on the narrow aperture of the valve is lower than the force of the propellent entering the reactor chamber (pot) through the valve. And the chamber is not sealed, it vents directly to the atmos, so there will be a pressure drop along the mass flow as well. But I think there might have been vasilation in the pilot valve as you suggest. KR RJD A&NTV

@antnew176 10 ай бұрын

@@RocketPlanet Not sure if you covered this (but I couldn't find it): how is the h2o2 pressurised? Is that thanks to the nitrogen tanks?

@TrapperAaron 10 ай бұрын

I would be interested to know if the sub valve ball was lapped against its sealing surface. Also was there any specialized heat treating done on the ball valves and seats?

@ENKI7477 8 ай бұрын

Continue your channel

@wktodd 10 ай бұрын

Given the change from machined cone to ball, I suspect the sub valve's initial purpose was found to be unnecessary , so simplified to just heating the chamber. To me, it's utility is to relieve the pressure in the pipe post 8/20ton valves (handy while testing)

@RocketPlanet 10 ай бұрын

Hi Bill, and thanks for posting. Yes, I think you may be right, and there was just enough in favour of the pilot valve rather than against it. I noticed how weak the spring was in the specimen examined, and it surprised me rather. I think the ball position would have fluctuated due to engine vibration - but presumably, by then, it didn't matter. KR RJD A&NTV

@wktodd 10 ай бұрын

@@RocketPlanetI have seen references to an astronomy and nature centre, is that still going? Would like to see the V2 exhibition

@atvheads 10 ай бұрын

Heat is an option to remove rusty old threads.

@mauricepanero 10 ай бұрын

So how did they pump the catalyst ? It can't have been in powder form as I've always have thought.

@sheep1ewe 10 ай бұрын

I am not sure, but until someone who can confirm this writes here, this is what i found about sodium permanganate "Being about 15 times more soluble than KMnO4, sodium permanganate finds some applications where very high concentrations of MnO4− are sought."

@sheep1ewe 10 ай бұрын

Since the alcohol component in the main fuel system allredy where dissolved in water i don't think water would interfer with any other part of the engines reaction, and by using sodium permanganate instead of potassium permanganate they could still manage to keep the concentration very high. Just my 5 cents...

@manifold1476 10 ай бұрын

pay attention

@RocketPlanet 10 ай бұрын

Hi Maurice, and thanks for posting. The sodium permanganate was introduced into the reactor pot as a 27% viscous solution (kept warm before tanking in cold weather). It was pumped from the 11 litre storage tank and into the reactor pot by air pressure at about 400psi (30atm). A contact valve was used to ensure the permanganate arrived in the reactor pot before the high-strength (82%) hydrogen peroxide. Other permanganate reactants were also used (eg calcium) but NaMno4 was the norm. KR RJD

@benwinter2420 10 ай бұрын

The OG bottle rocket

@striderkram 10 ай бұрын

I don't think the lower spring support was fastened to anything. There was no need to fasten it. I work in a valve repair shop and I've seen the effects of a relief valve spindle that had repeatedly, at high frequency and force, pounded against its guide due to valve chatter and the metal on the surface of the relief valve guide looks exactly like the part in the steam pot valve. Kind of fractured looking.

@Ro-zn6um 10 ай бұрын

I really love these video's. But seeing you force open that flanged connection in the beginning made me worried. Asbestos gaskets could have been used there. Please be careful, you guys.

@ljubomirculibrk4097 10 ай бұрын

Most of the problems come from fast changes of pressure. Subvalve is there to even out hydraulic shock to the system. Aka water hamer which can destroy welds or even burst piping in this case it can lead to bad combustion in rocket engine chamber. Cold start or fluded chamber whit later ignition of accumulated fuel oxidiser mix is not recomended. Booom...

@ntesla66 10 ай бұрын

I agree with you completely.

@vernepavreal7296 10 ай бұрын

loved the engineering detail The waste of human effort engineering etc on weapons and indeed single use launch vehicles generally appalls me hence my adoration of reusable orbital rockets if not the recent politics of the instigator

@wktodd 10 ай бұрын

Interesting video found by accident (KZfaq no longer recommending if history is off).

@otm646 10 ай бұрын

Is there a reason you're sandblasting and not using electrolysis here? You'd preserve all of the base metal and be left with a perfectly rust free surface.

@RocketPlanet 9 ай бұрын

Hi there, yes, I've used electrolytic rust removal. It works as well as acid, which I've used extensively on stage one rust. Stage one is the surface rust we see on items only exposed to air for a decade or so. When late stage two rusting and decay, sets in on things that have been exposed to the elements or have been in the ground for eighty years, electrolysis can do little to restore the original surface because it simply doesn't exist anymore. I've only ever used a professional electrolysis service offered by a powder coater, so I have no DIY experience. But I have a sand-blasting cabinet and use this largley "because it's there" and is low-cost. I favour it because you can use materials other than grit and get a fine, almost polished surface on some items. Thanks for posting. KR RJD A&NTV

@martin09091989 10 ай бұрын

That "fiberglass" is asbestos! 😅

@BurnleyNuts 10 ай бұрын

Miles better than BBC1

@mdesm2005 10 ай бұрын

you translated muffler but not aluminium

@kainhall 10 ай бұрын

18:04 thats really interesting.... definitely going to have to watch part 1 and 2 now lol . pretty modern design really..... after all the Saturn 5 was designed by an old nazi lol