Hunting the ghost of the V2 in the Rocketdyne A-7
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- Опубликовано: 4 июл 2024
- 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.
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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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Presented by Robert J Dalby
Produced by Astronomy and Nature TV 
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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
Cc translation please of videos
Fantastic video, thanks! The use of the models really help to bring your point across.
Fascinating how the red stone was a evolution of the V2.
EVERY rocket is an evolution of the V2
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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
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.
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
Konrad Dannenberg was such a nice man. He used to visit Space Camp classes and tell stories.
Thank you for that. I miss him everyday. Konrad was my first husband.
I love your videos, been watching you for years. I mostly love your astronomy videos and any other space related content!!!
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.
Absolutely brilliant, stuff, seeing the connections and evolution is fascinating.
Interesting and well made, thanks!
Thanks for posting this.
I always look forward to your rocket videos. Your explanations are so clear and concise. Thanks.
Very nicely presented... Maybe you could describe the USSR A-4 versions & Related designs history...
I really look forward to your videos, I have been following your channel for many years.
The final frontier started on the ground. What an amazing time it was. I would have loved to be a part of that.
Tha K you for sharing. Very interesting.
amazing stuff, thank you!
amazing technical details and comparison with further engine design
Amazing work! Thank you very much :)
Great presentation!
As a rocket nerd, this is truly great stuff.
Wonderful content as ever. 👍
Thank you!
Thanks, fascinating explanation.
Hello - thanks for your encouragement and generosity. Kind regards, RJD
Not a fan of rockets, but a fan of Robert. I’ll watch anyway.
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.
From A7 to F-1. What a journey...
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.
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)
When are you going to cover the LEV-3 guidance system?
Waiting for you to talk about scramjets and ramjets
.How does the 8 ton valve factor into the ballistic trajectory on a V2?
good
Brill! Did I miss Turbo pump part 2?
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
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.
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...
Who laanded on ze moon first? Say it!