A4 / V2 Rocket in detail: umbilical cable system
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- čas přidán 2. 09. 2012
- A closer look at the umbilical cable system used on the A4 / V2 rocket - the world's first ballistic missile and progenitor of all space exploration rockets. Our thanks to Dieter Beikirch for his help with this video.
Presented by Robert J Dalby FRAS
For more information on the technology and history of the A4-V2 missile visit our website at: www.v2rockethistory.com.
Produced by DB Video Services for Astronomy and Nature TV - Věda a technologie
My grandfather was an engineer working in Wernher von Braun's team at Peenemünde. I still own three of his engineering books
Working my way through the whole set, really huge credit is due to you for a level of detail and research beyond anything else I've seen on this subject.
wow, a super interesting CZcams video recommendation only 7 years late? I'll take it!
Yeah, ditto! How did I not find this sooner?!
The algorithm gods are fickle and cruel.
Same here !
You make some of the best videos on the A4. I like the
attention to the often overlooked parts like the umbilical.
CHEERS
Stunning video production and teaching skills. God I would have gone to school if school had been like this.
Thank you for your superb series on the A4 / V2.
This is an awesome show!
Thank you for telling us, you're a very good teacher!
According to the Operation backfire report 'German personnel stated that the failure of the plugs to throw off occurred in one in every ten rockets'
This guy is amazing.
Iv learnt so much about scpoes.things I would never have been able to learn elswhere.theres so many conflicting opinions on the net.but this man knows all. My hero
The umbilical cords failed to release. Reason for the launch failure on that footage I've seen a thousand times,... priceless.
Incredibly engaging presentation.
Regarding the final scene:
Is there a known correlation between the failure of the umbilical system and the failure of the rocket?
Incredible content.
Thanks a lot for sharing
Good work. Almost 10 years since this video came on.
Excellent!
The city corporations of London and Antwerp are in legal 'possession' of a lot of used V2s - but you'll need a metal detector, a shovel and a ton of glue. KR RJD
Well done Professor!
Fascinating.
Super film !
Un-paralleled detail, more please!
Nice information
Heavier wires may have used multiple pins for current carrying capacity.
Reminds me of a rudimentary Amphenol connection, I've soldered thousands of them.
This kicks ass, makes you think of all mind power that went into the making of these bad boys!
At 03:38 ... maybe the used multiple pins for the same connection/wire. Most likely power and ground. Both for redundancy and to handle the higher current.
more please!!!
We could really do with a explanation of the turbo pump, which is the most important part of the rocket. I wonder how they managed to control the mixture and get the thing to light? Also, regarding the gyro guidance system, there's rocket angle and heading to take care of, but what if the rocket (say) rotated about it's longitudinal axis by 90 degrees - the steering vanes would be incorrectly orientated I would think?
John Smith it was steam driven
Interesting, pin and socket seem similar to our earlier Swedish/German 1935 ASEA relays (plug in) Eg: 4mm pins, as used in Banana test connections, but better quality than a single wire spring (ours have 4 fan like nickel-silver fan contacts end riveted on a central spine, usually 10 pins per relay, and these 50% polarized, and standard silver contacts, 5 - 900mA rating )
(Nick Alexeev:- So both M & F connections in this above case are JACKS ? .'. We have 16/32 jack in a Box :)
Stotz still is a Part of ABB and based in Heidelberg.
I had heard of a large rocket engine very similar to this. It used "fire pucks" which were shallow flame cans with Pintle-Screw injectors, like Walter but lighter and simpler. Over 600 pintles in one engine. Lean burn, more chamber bleed through, swirl deliberately provoked, grossly overexpanded trumpet nozzle. Nozzle corrugated and resistance welded from chromadur. Pump turbine was a liquid rocket Cathrine wheel.
Any ideas as to this fable?
what parameters did the plugs pass? Do you have a list?
The flap seems to close after the sockets have existed the port.Was there perhaps and additional pull -string to release the flap or did it just rely on the sockets being propelled (dragged) out of the door?
This guy has an excellent vocabulary
Love these videos. Its like peeling on onion !
What was the function of the umbilical systems?
Does anyone have any information if this museum is still open to the public as I search showed the actual shop was closed ?????
Oh didn't know that in Gatow there is a piece of a V2/A4, gonna take my bicycle and go there ASAP
I'm building a scale model 4 inch diameter body tube V2 from scratch. I've searched exhaustively for drawings that show the bolt pattern where the tail assembly is bolted to the middle section containing the fuel tanks. These bolts are not equally spaced arount the circumference, and I'd like to get this detail right. Direction to doccumentation of this would be greatly appreciated!
I thought the Control cables would be released by eletrical magnets (solenoids) and not with explosives. Interesting video. Thump up!
wow wow ,, German technology have to give respect ,,, to those made this real
The cable connections weren't needed once the rocket launches, so I doubt that getting ripped off caused the malfunction.
Hi Gregory, and thanks for your post. Yes, I think you're right that the failure of the magnetic locks to let go is more likely to be a symptom than the cause. There are a number of pathways to the fatal engine shut-down we see here, and not all would exhibit the plug throw-off failure - but my money is on them being related upstream. KR RJD A&NTV
⭐️⭐️⭐️⭐️⭐️
7:26 maybe to protect the pins
I need further explanations on why the rocket failed because the umbilical cord didn't go off in due time in the last video clip...what was the special functionalities in the rocket that the umbilical cords powered...I was thinking it was only the ignition system that it powered up
@CipiRipi00 looking at those poor workers, I can imagine why there were unexplainable failures.
Supper food! Really!
little known fact von braun had a relationship with hanna reitsch
Is this really "fibreboard" or Pertinax a paper soaked in resin
Paxsoline GB fibre board ?
do you know where I can purchase a used A4 rocket
Redstone Arsenal, if anyone ..
Mechanically speaking, why would the sockets not disconnecting, bring down the whole missile? If the cable snapped, the feed is broken all the same.
Hi Rolf. Picture, if you will, a seemingly endless row of dominos. Each one capable of toppling the next in the classic manner. When the row collapses, we can point at any one domino and say 'This one caused this next one to fall'. And as far as it goes, this will be a true statement. But then we ask, what about the one before it? Surely that takes priority in the causal chain? And must be as ultimately responsible for the fall of any later domino as the one selected - unless the one selected really was the very first domino in the row? And the concatenation of dependent mechanisms in a missile is somewhat like dominos in this respect, but whether the event we see is causal, like any given domino falling, is harder to discern. You are correct in saying, I think, that the plugs failing to disengage did not cause the missile engine to shut down. An earlier 'falling domino' set a chain of events in motion, and the plug ejection failure was a consequence and not a primary cause. The first domino, or the guilty finger that pushes the domino, if you prefer, is likely to be somewhere back from the onboard launch switch (that triggers a cascade of actions at the instant of lift-off) and the ground control systems. The cast-off plugs should have operated and ejected as much as 4 seconds before the turbopump was up to launch speed. The missile shown in the video was one of eleven test launches in June/July 1943, and nearly all exhibited early engine shut-down, with most falling back on the launch area. The general cause was traced to poor relay performance, but the cable ejection failure was unique in this group. Thanks for the useful query letting me discuss this. KR RJD A&NTV
Thank you for both, it was fun to speculate this at the end of the video. Mr. Dalby's reply is very thorough and pretty much settles this question. But of course it can't be ideal if the plugs are ripped off, depending on how the individual leads are ripped. There can be dozens of uninsulated wire ends left sticking in the connectors, touching each other, possibly making short circuits or putting electricity in wrong places back in the onboard circuits.
Let's dispel all gender confusion about pins-plugs-sockets-jacks.
Pin and socket is the gender of the electrical contacts. The part at 1:42 has pins, it's mating part had sockets.
Plugs and jacks is the mechanical mobility of the connection. If it's on a cable, then it's a plug. If it's rigidly attached to the instrument, then it's a jack. A plug or a jack can have pins or sockets. We can have plug mating to a jack. We can have plug mating to another plug when two cables connect together. Jack mating to another jack happens less often. The part at 1:42 is rigidly attached to the rocket (spring mount notwithstanding), so it is a jack.
Hi Nick, and thanks for your thoughtful post. Many cable terminations conform to your prescription - but not all. I can think of only one area of V2 construction where the word Jack was regularly used (power supply to the Sterg). In the context of the umbilical system, the German technicians seem to have relied on context to identify which 'plug' they were referring to - often using the unmodified term 'plug' (die Stecker) to refer to both the onboard and the ground cable connector - and sometimes the Stotz Plug (die Stotz Stecker). Although the Stotz company contributed many switch and connection components to the V2 missile, everyone seemed to know what was being referred to when this name was used. Seems confusing, but I guess you had to be there. The connection system was non-standard and created for the purpose. I elected to identify the gendered parts by how they looked for the presentation. I was careful not to refer to any technical authority and introduced my terms with the words 'I am calling...'. Thanks for the helpful clarification. KR RJD A&NTV
Fledgling attempt to master the complexity’s of exiting the earth’s atmosphere and gravitational boundary.
See the mighty Saturn V to get a glimpse of further work on this theme.
The critical phase of 0 to five mph tip out of plumb a real danger.
Flight stabilization fins both external air stream and internal gas stream not yet able to apply adequate force.
The umbilicals must release cleanly to not sway vertical attitude.
High temperature materials in fins in gas stream a break through.
Also cooling of motor thrust chamber to prevent burn through of containment walls.
It’s very much about use of suitable materials in every component of the entire rocket body.
Insulative, electrified current conductive, heat and fuel resistant, structural integrity components.
Re entry fictional heat a rather daunting obstacle.
Just a few of the multiple challenges of materials choices.
I have a question... How the onboard gyros get the power....?
The Standard power for the Wehrmacht gyro equipment was 36V for "Luftwaffe" or 90V for "Kriegsmarine" 3 Phase 500Hz. The gyros in the rocket were powered over the Control cable from rotary Converter at ground control. Before the rocket launch the gyros must have the final rpm . A 2 pole synchronous motor get 30 000 rpm at 500Hz. It needs some 2 or 3 minutes to get this speed after turn on. So its are in need to power the gyros from ground.
When the rocket launched a control circuit switch the gyros to an onboard rotary converter. I assume that all gyros sent a ready- signal back to the ground control .
Wehrmacht rotary converters (umformer) appears all the time on ebay.
haha, thank you mate!
All those bent pins are extreme cringe.
This video is ridiculously quiet.
man did they want that rocket. and for sure not to fly to the moon (LOL)
Still a poor way to get into space with chemical rockets.2000 years old design ????.
Hi David, Well, short of making the big lumpy thing we are all standing on vanish, peer-reviewed papers exploring new methods of attaining extreme altitudes have hardly been clogging up the pages of aerospace engineering journals. Perhaps our 7.5 billion unimaginative fellows need a nudge and we should lead by example? I'll go first. How about hooking a long twisted steel cable on to the Moon spooling it 'down' to the Earth's surface and using cable car technology to zip up and down? Hmm, problematic maybe? Your turn then. KR RJD A&NTV
Funny.
Who says rockets are the only way into space???.
Very poor audio ! you put captions on the first one and then abused your audience with low audio and NO captions on the following vids. A lot of us older folks don't hear as well as we used to. Shame on you !
Hi there, your's is the first complaint we had like this. All I can say is we'll look into the caption situation - I didn't think any of our videos had captions! We tried automatic captions some years ago now and they produced text that was mostly nonsense. But we'll look into it again. Thanks for your post highlighting this. KR RJD A&NTV
Astronomy and Nature TV , nothing wrong with the entire series... it’s perfect.
The audio was very low in those videos, some was almost inaudible. Had the volume up full on the PC and youtube.