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Hunting the ghost of the V2 in the Rocketdyne A-7

During WWII, the urgency of Germany's V2 rocket program did not allow the technology to mature beyond the prototype stage. The A4/V2 missile employed in combat operations was essentially an early research prototype placed in series production due to the exigencies of war (contrary to popular conception, the V2 was never 'mass-produced'). The engineers tasked with addressing the issues of the fledgling missile were presented with a daunting challenge. They needed to rectify multiple flaws and malfunctions while also keeping up with the demand for increased missile production for the front lines. After the war and the dispersal of Germany's rocket specialists among the Allies, with the bulk going voluntarily to the USA, the group's understanding of these problem areas provided the spur for the rapid and successful evolution of liquid propellant rocket engines (LPRE) in the first post-war decade. To hunt down the ghost of the V2, Robert briefly examines some of the more noticeable shortcomings of the A4/V2 LPRE and ties them to corresponding but improved details in the NAA/Rocketdyne A-7 LPRE of 1951.
(Want to help us make more videos like this? See our Patreon link below.)
00:00 Start
00:53 Introduction
01:33 Data on V2 and A-7
02:20 A-7 from the ground up
02:41 Dannenberg fuel manifold
03:35 Flat injector head
04:26 A4 thrust chamber 1943
04:50 A4 intentions
05:45 A-7 thrust frame
06:00 Turbopumps
06:23 Closer coupling
07:12 Bellows not bends
08:00 Heat exchanger
08:28 Steam generation
09:40 Thrust control
10:19 US V2 LPRE hybrid
11:23 Thrust frame woes
12:18 Legacy of the V2
13:08 End credits
13:28 Final statement
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Although Turbopump Part 2 was three years in the making, very little of that time was spent in front of a camera. Most of the time and effort was spent in research, and you can see the culmination in the hour-and-three-quarter video presented here.
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Presented by Robert J Dalby
Produced by Astronomy and Nature TV

Пікірлер: 43

  • @RocketPlanet
    @RocketPlanet Жыл бұрын

    Thanks to all of you who comment and provide feedback - it's important to us and helps shape the channel. But as Gordon Cooper may have said: funding makes this bird go up! So we have recently started SuperThanks, and our sincere thanks go to Blake and gshort47087 for directly supporting our work. All funding support is most welcome, but your comments are important too, so please keep them coming! Thanks for watching. Kind regards Robert J Dalby

  • @quantinium

    @quantinium

    Жыл бұрын

    Cc translation please of videos

  • @clavius5734
    @clavius5734 Жыл бұрын

    Fantastic video, thanks! The use of the models really help to bring your point across.

  • @marka7831
    @marka7831 Жыл бұрын

    A friend was an engineer at Glenn L Martin in the 1950s. He worked on the other cousin of the V-2 the Viking. One of his jobs was to measure the deflection of the structure that supported the engine, the deflection had to be figured into the controls of the rocket. They planned to load the rocket with hydraulic jacks and measure the deflection with dial indicators. My friend was told to just stick his head into the bottom of the rocket and read the dial indicators. He politely refused and suggested that they could cut some holes in the skirt without affecting anythng. Good thing they did because one afternoon during a test the whole assembly squashed into a heap of junk.

  • @RocketPlanet

    @RocketPlanet

    Жыл бұрын

    Hi there, and thanks for posting. The US aerospace industry of the 1950s was a bit more gung-ho and a lot less fearful of injury litigation! If you haven't already done so, please don't forget to subscribe - it helps us more than you might think and ensures you won't miss our next upload on the A4/V2 missile. KR RJD A&NTV

  • @mikus4242
    @mikus4242 Жыл бұрын

    Fascinating how the red stone was a evolution of the V2.

  • @markodonoghue9526

    @markodonoghue9526

    Жыл бұрын

    EVERY rocket is an evolution of the V2 .

  • @dubsy1026
    @dubsy1026 Жыл бұрын

    I don't know what kind of scope you're planning for the channel, but I'd be incredibly interested in more info on early 50s rocket engines and how we got to standard combustion based gas generator cycles

  • @cogoid
    @cogoid Жыл бұрын

    This was a very good video and a great explanation! Just to add, the US designed line of these engines was called NAA 75-110-A1 through NAA 75-110-A7. They all looked rather similar, and were interchangeable. The version number A7 started to fly in 1958, while A1 first flew in 1953, on the first flight of Redstone. NAA stood for North American Aviation (NAA), the parent company of Rocketdyne. The 75 in the part number was for the thrust, equal to 75 thousand pounds of force.

  • @Un_known861
    @Un_known861 Жыл бұрын

    I love your videos, been watching you for years. I mostly love your astronomy videos and any other space related content!!!

  • @JimWattsHereNow
    @JimWattsHereNow Жыл бұрын

    Absolutely brilliant, stuff, seeing the connections and evolution is fascinating.

  • @atomicshadowman9143
    @atomicshadowman9143 Жыл бұрын

    Konrad Dannenberg was such a nice man. He used to visit Space Camp classes and tell stories.

  • @JackieDannenberg

    @JackieDannenberg

    Жыл бұрын

    Thank you for that. I miss him everyday. Konrad was my first husband.

  • @REXOB9
    @REXOB9 Жыл бұрын

    I always look forward to your rocket videos. Your explanations are so clear and concise. Thanks.

  • @tomstrum6259
    @tomstrum62598 ай бұрын

    Very nicely presented... Maybe you could describe the USSR A-4 versions & Related designs history...

  • @MrGeoffHilton
    @MrGeoffHilton Жыл бұрын

    I really look forward to your videos, I have been following your channel for many years.

  • @andygray9285
    @andygray9285 Жыл бұрын

    Thanks for posting this.

  • @tiitsaul9036
    @tiitsaul9036 Жыл бұрын

    Tha K you for sharing. Very interesting.

  • @R3D_D2H
    @R3D_D2H11 ай бұрын

    amazing stuff, thank you!

  • @alexmontgomery255
    @alexmontgomery255 Жыл бұрын

    The final frontier started on the ground. What an amazing time it was. I would have loved to be a part of that.

  • @TimPerfetto
    @TimPerfetto Жыл бұрын

    Thank you!

  • @mikhailzh913
    @mikhailzh913 Жыл бұрын

    amazing technical details and comparison with further engine design

  • @WWeronko
    @WWeronko11 ай бұрын

    As a rocket nerd, this is truly great stuff.

  • @gshort4707
    @gshort4707 Жыл бұрын

    Thanks, fascinating explanation.

  • @RocketPlanet

    @RocketPlanet

    Жыл бұрын

    Hello - thanks for your encouragement and generosity. Kind regards, RJD

  • @kimgosseye8588
    @kimgosseye8588 Жыл бұрын

    Amazing work! Thank you very much :)

  • @namenotshown9277
    @namenotshown9277 Жыл бұрын

    I'm guessing thrust vectoring by moving the whole engine was in the back of the minds of the engineers, probably from the very earliest designs. Really excellent knowledge based video, looking forward to the next video. The pipe bending benches at peenemunde were very interesting, ever tried using their methods for bending pipes, seems just a vice and some sort of jig is required, I'm guessing quite a bit of skill also needs to be learned.

  • @stco2426
    @stco242611 ай бұрын

    Interesting and well made, thanks!

  • @bobbymath2813
    @bobbymath2813 Жыл бұрын

    Not a fan of rockets, but a fan of Robert. I’ll watch anyway.

  • @CaptRescue2
    @CaptRescue2 Жыл бұрын

    Great presentation!

  • @johannesdesloper8434
    @johannesdesloper8434 Жыл бұрын

    I didn't like the voice over going with the gestures that much , but I must say you make very good informative video's on the V2 with seemingly well reasearched conent. Learned a lot, like it a lot.

  • @robinwells8879
    @robinwells8879 Жыл бұрын

    Wonderful content as ever. 👍

  • @sundhaug92
    @sundhaug92 Жыл бұрын

    Worth noting that the A-7 and A-4 use different (but similar) numbering, the US A-1 was an upgraded A-4 design (because why make numbering easy)

  • @milantrcka121
    @milantrcka12111 ай бұрын

    From A7 to F-1. What a journey...

  • @henryj.8528
    @henryj.852811 ай бұрын

    When are you going to cover the LEV-3 guidance system?

  • @catstercatster
    @catstercatster Жыл бұрын

    Brill! Did I miss Turbo pump part 2?

  • @RocketPlanet

    @RocketPlanet

    Жыл бұрын

    Hi there, thanks for your generosity. No, you haven't missed it - we are working on it, so please stay tuned, and thanks again for your kind support. Kind regards, RJD

  • @user-qj7cs9vg3t
    @user-qj7cs9vg3t Жыл бұрын

    Waiting for you to talk about scramjets and ramjets

  • @spottydog4477
    @spottydog4477 Жыл бұрын

    .How does the 8 ton valve factor into the ballistic trajectory on a V2?

  • @KatanamasterV
    @KatanamasterV Жыл бұрын

    Comments for the algorithm. But more seriously and I thought I just had. How much did the Regulus system or the other immediate post-war systems beyond Redstone owe to the V2 family? In terms of parts and/or components not just German staff and generic expertise.

  • @petecottham5385
    @petecottham5385 Жыл бұрын

    Hindsight is a wonderful thing!...comparing the flat face of the redstone engine injector with the much later Saturn F1 engine solution to the instability problem makes one wonder why the Germans or the redstone engineers didn't make what now seems a logical step and divide the injector face with baffles to contain the resonance? I read somewhere the early Russian engine designs suffered from similar instability but they solved it by adding lots of small more robust engines hence the R7 (and perhaps Musk?) Look to the vehicle...

  • @aspace5920
    @aspace5920 Жыл бұрын

    good

  • @808bigisland
    @808bigisland Жыл бұрын

    Who laanded on ze moon first? Say it!