Why North Korea Can't Build An ICBM (yet)
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- Опубликовано: 7 сен 2017
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Наука
I tried to approach the topic without mentioning any politics. The whole situation is incredibly complex, but the media have been blowing the threat out of proportion and I wanted to quell the insanity a little.
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you mentioned reentry, but what about the EMP effect of nuclear weapons?
I'm pretty sure fissionable materials have to be triggered in a certain way and that just being in an explosion wouldn't detonate it. Either way, the DPRK isn't smart enough to think of an attack like that.
That North Korea can not build a ICBM is wrong, because the NK got all technology from Ukraine.There are article out, that experts are sure, that the rocket engine is made in Ukraine. And i know that North Korea bought a lot of Tanks and other stuff from the Ukraine.
That technology is decades old, far behind the rest of the world if it even works at all.
Günther Lehmann also I believe there was a CIA assessment claiming that there Re-entry vehicles would of preformed adequately if actually flown towards actually u.s targets instead of them firing them straight up although there accuracy is still bad.
Does skillshare have classes on building ICBMs??
Well done hahahahahaha
Honestly, Il recomend you their space laser class.
Only on the north korean website
no but the wiki does
LOL
why did the chicken cross the road?
because north korea's long-range missiles cant reach that far
Lmao
Hahaha why just cuz you don't like them? Just cuz they're enemies of the west? Isreal managed in the 60's. N. Koreans are smart as fuck, best hacker group on Earth, get over yourself. They've figured out intercontinental/intercountry ROCKETS and miniaturization *gasp*
@Scrim killa Are they though? I'm sure they're in poverty and any dictatorship would suck but I think about things realistically.. not just whats supplemented in my mind from the news. They have tons of buildings and roads, which we'll focus on for now, which means toonnsss of engineers, construction workers, truck drivers, material suppliers, distributors, people in offices doing the paperwork, etc. They had the same population as S. Korea when it was split in half, which means millions and millions of people. It's impossible that they don't have a large middle class, wealthy people, and of course a whole lot of poor. They have plenty of bridges, dams, and other engineering feats that would be impossible if they were this 3rd world country you speak of. Just because their govt is secretive, doesn't mean they are doing as bad as you think. They are apparently stable, with millions to feed every day with modern plumbing (a feat in itself) to boot. Use your brain and think about things with a sense of realism. Besides their tortuous slave camps, where they house generation after generation of "traitors," escapees returned by China and political prisoners, they're doing fine. People like you grow up into politicians and underestimate people like the Koreans. That's how we let this nuclear mess go on for long :/ 😔
@@Dev-In-Denver123 do something about it
@@blackhole4106 Well.. IDC lmao. I'd do just like Kim and Vladimir and Xi Jinping if I could too 😄. Now YOU do something about it.
Make a new video “how North Korea has made an ICBM”
No they haven't.
Ronnie Rabell lmao they literally have
HAHAHA yesss
@@ronnierabell1 Hahaha why just cuz you don't like them? Just cuz they're enemies of the west? Isreal managed in the 60's. N. Koreans are smart as fuck, best hacker group on Earth, get over yourself. They've figured out intercontinental/intercountry ROCKETS *gasp*
@@Dev-In-Denver123 Russian hacker : Am I a floppy disk to you?
Great video! Nice animation of a gyroscope too
There's a bunch of really good vintage space videos on early ICBMs if you want a more in depth info
Yeap, her videos are great. Highly recommend
Real Engineering whose?
vintage space
Mohammad Usman You need to see Jeff Quitney's channel with old NASA and USAF released material. This one is a good beginner's guide to solving the re-entry problem: ruclips.net/video/6hb9be6Sg0U/видео.html
metalhead2508 Rob space thanks guys. :)))
*Next week:*
"Breaking news, North Korea has an ICBM."
How is *anyone* gonna know?
@@dumbleking5172 spies?
North Korea:
I’m gonna end this man’s whole career
You don't need GPS. They designed modern missiles that follow the stars for guidance. Not kidding.
GPS can be spoofed , usually a gyroscope based INS and other supplementary navigation.
The GPS satellites are owned by the government and thus the civilization access is less accurate and movable.
I have a better idea: remote control. Give it to a guy, and fly it like an rc thing
@@zathary564 it can be jammed easily or hacked
so its not that reliable
@@korvo9936 just give him an uno reverse card
Im living in south korea and im genuinely scared but real engineering is cheering me up with videos
CS Noob
Don't worry NK only has enough artillery to level your capital.
Mr.Dr.Professor Toaster 11/10 No pressure
CS Noob nope you should be a little worried. If something goes wrong you are first to get hit because you're close. They could drop it by plane. You are out of luck buddy. Just kidding. Well you are protected with MAD (Mutual assured destruction). Or if Fat Kimy drops the first bomb then the total destruction of North Korea by USA and allies.
so long as you arent one of 10 million in Seoul, with an unknown amount of artillery cannons pointed that way, you should be relatively safe. At least from missiles. But i think everything will be okay, and just in case, learn about the nearest bomb shelter and the best routes to it. Im praying for the peace of the two Koreas
SupremeSuccLord nothing is 100% safe. One bomber could somehowe slip through air defense around Seoul.
How can you stop North Korea? Send Kim a box full of reese's cups
TK H Snickers
Your Not you when your Hungry
TK H only chocolate M&Ms can stop wim
That would be the best snickers commercial ever. Kim eats a snickers and goes back to being ____ (insert someone nice/respectable here) Not sure who'd be funniest.
Kim would turn into Ken Jeong BEST IDEA EVER
I can't stop watching your videos. I have learned so much. I work in computers but never really knew how a transistor worked, I just knew that it did. keep up the good work.
Two fun facts: normal GPS will stop working after a certain speed (Mach 2 I think?) to prevent its use in guided missiles. Similarly, there’s a restriction on the frame rate of thermal cameras to prevent their use in heat-seeking missiles.
Roses are red.
Kim Jong Un is hardly a real threat.
Why North Korea Cant Build An ICBM (yet)
Matey! They have one that can hit mainland US
Aubrey Graham Says who? CNN and Kim's propaganda?
+Aubrey Graham
No they don't.
And even if they did, it'd be shot down long before it could impact.
r/bootobig
+Richard Driskill why not? If we can launch a Nuke as fast and as far away at that, then why can't we launch a much more lightweight and faster Anti-Missile?
Its not because its hard to achieve, its because its achievable to take down an ICBM.
There already are active Anti-ICBM batteries on US or Europe
Because Kim jun un eats too much that it consumes 70% of their military budget lol
The Earth OOOOOHHHHH GET SHR3KT M8
Maybe if Kim put some Sauce or Mayo over the Missile it could withstand reentry to not burn all the Calories and actually get there.
Split Shockwave Lel
The Earth Kim is too freaking fat, he is a fat dingus even His mom hates him
The Earth ?
hah....2 months later
Real Engineering thank you so much for taking the time to make these videos. Out of everything I have watched on RUclips... Real Engineering has been the most informative entertaining. Thank you
The Supreme Leader Thanks You For This Video
Adam Chase shit um this was a fake
South korea is just across the river...
Ilsunny Lo i don't think you quite understand...
South Korea is probably the least likely for a nuclear attack. The entire reason North Korea hasn't been crushed by every country it's pissed off is because they have a shitload of artillery pointed at their hostage, South Korea. If anyone were to go near North Korea, Seoul (South Korea's capital) would be blown to bits in a second.
What river are you talking about ? There is no river between both korea
+Zach Gullerman but here's the real question: Why the fuck is the Capital of SK located right on the border
i have often wondered about that geographical fact myself. I think i would maybe propose a vote to move the city :P
Me: *sees title of the video* : kalm
Me *sees when it was relased* : PANIKKK
This video didn’t age well
It is still kind of right. NK missiles have a serious issue with reliability.
Stupid video to begin with, it only came out a year ago. Top N. Koreans were probably long done celebrating successful rocket tests when this video was published
@@epikmanthe3rd According to... Who?
@@Dev-In-Denver123 US intelligence questions the capability of the missiles to survive reentry at steeper angles. Past tests have also shown severe deficiencies in reliability of their missile programs, specifically long range weapons. Their most reliable weapons uses a fairly flat trajectory which is much easier to intercept.
@@Dev-In-Denver123 www.38north.org/2019/07/vvandiepen072519/ a much more in-depth article with sources.
Great video! Just one correction. While the A-4 did use a measured fuel system, it was not the means of controlling range, it was found incapable of actually doing so, more importantly it also incorporated automatic fuel cutoff systems to prevent overburning and simply used fuel supplied as an estimate to cover requisite distance. The first systems used a wireless transmission system to send current velocity ground measured velocity to the rocket which would be checked and cutoff if it passed the measured threshold. Later on the I-Gerät 1/3 integrating accelerometers and I-Gerät 2 electrolytic integrative accelerometer were used to accomplish this Brenschluss.
There is a good reason not to freak out too much if you are an American as the video shows. It is Japan and especially South Korea that is under greatest threat right now. But I hope calmer and more rational minds wins out.
In any case, North Korea wouldn't attack if they aren't attacked. The nukes (launched to its allies) only are a deterrent to the USA overthrowing Kim.
Yeah. If they use them they lose all deterrent they have. I would not see it as a rational act. And while Kim may act irrationally it is likely just that, an act. I do think that if the war goes hot again that they might use nuclear weapons. But not until they feel really treated. Not some minor skirmish where there is not real treat to them.
The point is you don't gamble on the other guy being rational when the stakes are a build up of their ability to cause mass harm.
Yes. But you do not beat irrational behavior by being irrational your self. That is just an old myth. Like the way to beat a chess expect is to make an irritational play. It may throw off a competent play but a master will just adapt and exploit the irrational move.
You do not have anything to win by assuming that Kim is irrational. You should have a plan for that eventuality. Just like you should have plan for what happens if there is a coup in North Korea. But you can not try to make a preemptive strike that would likely just lead to a full-scale war. As the irrational move for Kim would not be go on full counter attack if that happened. A irrational person would also be likely to do rational move at times.
The building of missile defenses shields is the actually one of these back up plans for it North Korea would act irrational.
Lets hope Kim Jon In doesn't find out about ksp...
I'm worried about all the kerbals he would use...
Poor jeb.
Oh god
This is one of those channels that anyone can enjoy and learn at the same time
While some people are freaking out over missiles North Korea has thousands of artillery aimed at the millions of civilians living in Seoul.
Jon Umine they have russian s300 and possibly s400 SAMs. Those would be a big issue for american airpower
That is indeed a much bigger and more tangible threat.
Jon Umine I don't think this is that easy. Artilleries can be hidden, and it takes lot of firepower and airpower to destroy so many artilleries. I'd say 30-60 min of heavy pounding. By then, SK and US would have destroyed most artillery. But NK would be able to keep pounding for many more hours.
Aditya Patil add to that every artillery gun is probably pre - targeted for either Seoul or military bases on the DMZ, also even if those guns were only in operation for an hour (for the sake of arguement), they still have 8,600 assorted artillery guns most with a rate of fire of 5-6 rounds per minute. So doing the math thats roughly 2.5 million artillery shells that could be fired in that first hour, this is provided ammunition stores hold out, no mechanical breakdowns, crews dont take any breaks in that time and that all of their artillery pieces are active and located on the border
That is a scary volume of firepower that could be unleashed
Jon Umine North Koreans have had 50 years to hide and protect their arty, a single bombing run wont destroy thousands of hidden, protected artillery. It could take days before the last artillery bunkers are destroyed.
4 yrs later and North Korea has build the ICBM.
Wow this channel has exploded since the first vid and when I subbed, for good reason too, so clear and nice animations as well!
Thanks for the history, well done, subbed.
Here from future. Bro they took your video as a challenge.
Now they have ICBMs😅
0:12 here's your ad skip
Well stated about the complexity involved. Thank you.
Great video......looking forward to the next one.
Kim you are not you when your hungry eat a snickers
Kim: *eats 237 snickers*
Kim: "I'm still hangry, lets threaten to bomb Thailand if they dont send some Pad Thai"
@@arthas640 They won't attack fellow military-controlled country without attack their mortal enemy first.
me:.................................. s*** i don't even like snickers!
First of all, great channel! Secondly: You should totally do a video about hovercraft technology - just a spontaneous thought :D
I have a theory as to how they could have potentially made a manned ICBM work in WW2.... if instead of ejecting from the ICBM upwards, could they not devise a mechanism to open up underneath the ICBM and slant his seat - essentially flipping it back to front prior to ejecting. Meaning he will be facing the rear of the missile upon hitting the force of the air outside of the aircraft, being shielded by his seat. Protecting his neck from whiplash while deploying the chute 10 sec after - to allow for safe deceleration as to not tear his parachute. He can be supplied with a 5L air canister strapped to his chest so as to not suffocate from the drop in air pressure at the point of ejection process starting underneath him. ( I know this wont work, but i thought i would give an attempt at it)....
3:20 *Separate* - I always think of _separate_ and _apart_ to remind me it's an _a_
Thank you random internet use from the past, always get that one wrong.
Time to update this video
Awesome video dude!
REVs do not use the blunt body method but solely rely on ablative cooling/shielding. They also use a sharper even worse angle of entry.
North korea:
"Hold my beer"
I bet there were similar "Why USSR can't build nuclear bomb" research in late 1940s.
Максим Синёв that's why the title says (yet)
Максим Синёв except USSR was much bigger than North Korea, and it had relatively good relations with other countries at the time and wasn't as much behind other countries in terms of military technology as NK, yet still they only managed to develop the bomb by stealing plans from the US and developed ICBMs only because they had german engineers who created V2 (and first USRR missiles were basically V2 ripoffs).
I wouldn't be concerned too much about NK attacking US with ICBMs; the bigger problem is the possibility of NK attacking neighboring countries with nukes (especially South Korea).
Also I wouldn't be surprised if after the resulting counterattack Kim Jong decided to nuke his own country just to take out the enemy. Just imagine the civillian losses.
The problem with nukes is not their offensive potential. The real problem is, once a country gets nukes (especiall a crazy country like NK), it becomes impossible to defeat without insane losses on both sides, unless you have ICBMs and nuke it before it gets its ICBMs and nukes you, but then NK could still threaten to nuke neighboring countries once they detect incoming ICBMs.
^ You could say the same exact thing about America.
Максим Синёв LMAO there's no comparison. 40s and 50s USSR had a far better economy and WAY more resources than North Korea.
Truman believed USSR is decades from bomb.
Good channel dude!
Great video. I love these vids... i love this guy!
Great production, this is just miles ahead of mainstream media. It's because of this type of high quality content i don't even own a television anymore :D
You should have other sources too. There were a number of mistakes made in this video such as the purpose for the shape of your typical re-entry capsule. The reason behind the assumptions that NK can't create a re-entry capsule for a small nuclear device is because one of their tests didn't make the cut, however using that same reasoning you'd believe SpaceX wouldn't have ever made it either, and a tr-entry capsule is significantly easier to create than what SpaceX has done.
The only question is if they have small nuclear devices or not. - The re-entry Capsule would be easy as all get out for them to create. Do they? Well they say that they do and we don't have proof that they don't.
Patriot 03 good point, can you point to some other sources?
pedrofdmp are you talking about? This video was absolute trash, completely misinformed, mostly personal opinion, and worst of all politically biased.
Xortsa interesting, why do you say so?
Whelp, that didn't age well.
Luckily you put "yet" after that sentence, seen how it is 5 years later.
Awesome Video...Great Job.
very objective and well made vid!
i got some neat ideas for your channel, like:
using games that allow you to engineer well known devices, such as tanks, planes, or in this case missiles and guided rockets, in this particular instance using kerbal space program.
so you would have this vid, and a link to how to build a V2, or a Saturn V by yourself, virtually.
that could make you twice-ly awesome =]
""NORTH KOREA WANTS TO KNOW YOUR LOCATION""
but the Hwasong-14?
Wilhelm VonRoefelz how do you know sir?
Wilhelm VonRoefelz ICBM use satellite and inertial guidance you idiot, you know nothing about missile technology
Wilhelm VonRoefelz - Doesn't pretty much everything in the US arsenal predate satellite navigation?
Ben i think its optional as they may not need satillite guidance if they already have coordinates.
Wilhelm VonRoefelz they need satellite guidance otherwise their ICBM will be inaccurate you idiot
Great video!
Could you make a video on railguns?
I saw a video of one being tested and i was wondering about how exactly they worked and what the advantage could be relative to a traditonal gun.
Because he do not have membership of skillshare.
Video: Why North Korea can't build an ICM (yet)
Me: lol so we're safe.
Also Video: 2 years ago.
Worth noting ICBM's don't use blunt body re-entry, and instead have extremely streamlined rentry vehicles.
This allows them to reach the ground extraordinarily quickly which is part of why they're so difficult to counter
Chris Burkard is an awesome photographer. Love his work.
1. [title] "cant" [sic; nt→n't]; 2. [03:17] "seperation" [sic; e→a]; 3. According to Janes 1996 NK's neighbor had the DF-41 ICBM....
North Korea military parade 2020.
Splendid! Thank you.
Chinese military expert as saying China cannot stop North Korea from using Beidou in military operations.
Beside Beidou, the other main satellite navigation options for North Korea are the Global Positioning System of the United States and the Russian system known as Glonass.
Kim could build ICBM if he use skillshare!
Stop that
Moss Man r/itwasfunnyshutup
3:24 Separation not Seperation
Super interesting video!👍
Another channel I didn't know I needed. These kinds of specialised documentary style channels are definitely the future of RUclips.
What? They already have a ICBM.
What about a HEMP? Sure you still need guidance but no heat shielding.
for re-entry NOT
for getting Higher.... OK... Hemp... Rope.... Climb it..... Up.....
Guidance ? like steering.......ROFLMAO....... HEM..(burp)P iss off
+jerry slater
*Not sure if trolling, bad at formulating words or just stupid*
So did you actually fail to google HEMP a.k.a. High Altitude ElectroMagnetic Pulse when you had no idea what i wrote or is this some really stupid looking trolling attempt?
Interesting points, but it would be ignorant to underestimate anyone. It's impressive what they've been able to create.
Heat shields use a special substance to keep it cool enough to not explode. This could be used on an intercontinental missile.
The substance is called “albator” or something.
Looks like they may have done it. 2800 miles into space and a successful reentry means that they can reach the US.
We can't wait for your update video. Thanks for your good work!
Wait, that mean the first country to send human in space is NAZI germany
This video is now expired.
and they misspelled the word "separation"....lol
NK’s nukes still are ass and fall short 💀
@@robertdawg4754 They can reach the same distance as America, but they're so out of date , and most likely would either fall short into the ocean or hit canada.😂 and we have a shield to shoot them down so easily.
0:45 YES I GOT MY V2 ROCKET KILLSTREAK
6:30 since GPS Selective Availability (SA) was removed in 2007, accuracy is usually within 4 metres, at 95% Confidence Interval. Good enough to hit anything with a nuke...
Can't*
Laurynas Čekanavičius *missile flies over Japan
john mangele Missile, not Nuclear Warhead.
It's bother me alot too,
* sigh *
3rd wordler.
*sees video title*
Phew, they can't reach us yet!
**Uploaded 2 years ago**
Me: (0_0)
Ahem 3 years
3:30
For interest's sake, is that a damping harmonic function or does it just look like one?
The re-entry nose cone lasted until 1km in height which is the optimal height for an emp. They have an ICBM, accuracy doesn't matter with 160kt thermonuclear warhead.
guess who just launched one
Me, it came out of my ass and was actually biological AND nuclear in nature.
this aged well
I do enjoy these videos. Even ones about terrible human inventions. Also just got to love the Irish brogue narration.
Real engineering. Could you guys do a video on the SR71 black bird pleaseeee
Will we see a - How did North Korea manage to build a ICBM - Now?
Pli Mak I would love to see that.
A real fact is that the world has underestimated the DPRK. Videos like this contribute to kicking the can down the road: "...well they have X, but they can't do Y so we should all not worry." What we should be saying is that "they have X, and they'll have Y soon and it'll be horrible - what are we going to do now so that they don't get Y."
How about the US has X, has used it twice and thinks it can use tactical Y's with first strike and rule the world. It is horrible already, what are we doing to rid the US of X's and Y's. US International policy - Saddam is bad - hurts thousands of his own people - lets invade and kill a million - US good - now apply to NK.
Good video!
Most ICBMs don't use satellite navigation and instead use inertial and celestial navigation as those signals can be easily jammed or spoofed.
1 month later:
*north korea launches ICBM*
The video does not prove its title to be true.
1. NK's 2 ICBMs this year did survive re-entry back to the atmosphere.
2. NK not only can miniaturize nukes but also h-bombs now.
3. The latest test proved they'd reach our East Coast if shot at a lower angle.
All that this video proves is that it "was" a difficult task for previous challengers like Nazi Germany.
east or west??
One thing:A typical ICBM does not use satellites for guiding, instead, it use celestial navigation system (an optical system which tracks star light, just as the ancient sextant).although it is heavy and expensive, but the reliability is perfect.
The heat-shield thing may be solvable by the kind of plastics that go into car brake pads and foamed ceramics seen in industrial ovens (those are basically what's on the Space Shuttle), and even small countries that aren't building rockets can make those things... So as of now I'd say the only limit is that if they put the kind of payload on that can actually do anything, the rocket loses the range needed to really reach out anywhere. It's one thing to fly something nearly empty and say it can reach, when putting something heavy in there changes that significantly. I'd also say it's hard to judge any success at miniturization with just the result of underground tests (bigger boom could just be a bigger bomb to start with), so that factor is still a somewhat ambiguous claim.
So they have the necessary oil and gold but not enough knowledge. Rise of Nations was surprisingly accurate.
There is still hope.
Wow the first comment is one that doesn't say first.
a casual name you actually are congrats
rocket science is really hard thanks for the video
You forgot that also in mid course ICBMs use celestial guidance , just like sailors used to use a sextant to calculate their positions.
The North Koreans could use the U.S. public GPS network. It's available to anyone. It's just like military-grade (it's from the same satellites), except it's only accurate to ten or twenty meters, not ten or twenty centimeters. But that's good enough for Kim's needs.
Public GPS shuts off the moment the receiver begins acting like a missile
zippymax1 riposte dont worry they dont have internet :D MEMES RUSH
This limit is only programmed into the receivers, it shouldnt be impossible to bypass it.
Real Engineering: wrong. Your _device_ itself is programmed to shut down if the GPS signals it receives from the satellites indicate it is travelling at over 1200 mph. The satellites don't shut off their signals. Use your head. That would drop all GPS for everyone in that entire hemisphere of the world. We don't all get some special individual beam from the satellite. We all use the same beam, and it takes at least four satellites for your cell phone to triangulate its own position. Drones require six.
The signal is one-way. Do you really think your phone is constantly broadcasting info back to a satellite? Nope. Yet that's the only way the satellite would know to shut off. Your phone can't effectively broadcast much past the nearest cell tower. It's just receiving signals from four powerfully-broadcasting geostationary satellites in the sky and number-crunching that info internally into its own positional coordinates.
NK would just have to build its own little guidance system and leave out the Shutdown-At-1200MPH line in its programming.
That just means they can't use a commercially available receiver. Technically, nothing is stopping them from engineering they're own receivers without the restriction. One hacker already did, and was even kind enough to post the instructions and source code online for everyone to see: www.aholme.co.uk/GPS/Main.htm
Of course the obvious downside to relying directly on your enemies infrastructure, is that the US army could just shut down civilian GPS at any time if they felt there was a threat (as you yourself already mentioned in your GPS video) and then NK would be back at square one.
fast forward to today... ...that was a very short "yet"
Ive wondered about how they would guide the ICBM's for a while now. That seemed to me to be the biggest hurdle they would have to figure out. Glad someone else thinks so too :-D
Why does some rockets you've shown in this video have a initial blast to launch it into mid air, and then another ignition in the rocket to set it off? And what is this launching method called? Why is it used?
Yeah, they just did it!
Just saw articles about how they failed reentry tests, you need to do more research before claiming fake news.
It's not good enough. It may hit the U.S, but it would probably hit just off the coast off the U.S.
they bought it from china
The hydrogen bombs warheads they now own need no precision whatsoever, as one such detonation can wipe out the area of an entire state.
But I think the point to be made here is that the Warhead would burn up, therefore preventing the h-bomb from hitting the surface and exploding. Duh
This didn't age well
1. Long distance rocket
The Aggregat 4 (aka V2) was the longest ranged missile at it's time, but 320 km --- a distance covered in ca. 65 minutes by a B-17 Flying Fortress --- is not really long range.
2. Intercontinental winged ballistic missile?
A (never built) combination of a winged A4 and a first stage for it would be intercontinental, but due to the wings not ballistic (and likely interceptable at least sometimes even with WWII technology, totally unlike the A4).
3. Setting the compass to the right direction
There was no compass or compass setting as you describe it. The (marked) wing 1 of the A4 would be pointed exactly the right direction with a rotatable, levelled platform. This allowed using only 1 gyroscope for roll and yaw. Improvements were planned and some flown.
4. The "control fins" in the A4 were both conventional control surfaces at the fins and thrust vectoring with graphite fins inside the exhaust to have control at the slow speeds around launch.
5. The Germans did not use 'the amount of fuel calculated by a slide rule' to set the range. Which one of your sources does claim that crap?
The Aggregat 4 used a Mueller-type "Pendulous Integrating Gyroscopic Accelerometer", a PIGA (en.wikipedia.org/wiki/PIGA_accelerometer), still used today, to switch the engine to low thrust at 95% of the end speed and to shut down the engine completely upon reaching the end speed.
Also, the engine was started on the ground at "low thrust", so the responsible officer had a visual proof the engine was running properly before ordering the launch.
6. Suicide jump-out A4 rockets to attack the USA
Somebody is confusing and conflating a lot of things ...
The diagram, up and down through the atmosphere is likely referring to the "Silbervogel" (suborbital spaceplane) concept, started in 1931. It would rise to 145 km, and repeatedly dip into the atmosphere; the lifting body design would carry up again, for a somehwat shorter hop, lather, rinse, repeat. As bomber it was to drop 4,000 kg onto the continental US, skipping on and landing normally somehwere on Japan-held Pacific territory, before leaving the cockpit the normal way.
The jumping out was likely the Fieseler Fi 103R "Reichenberg-Gerät", a manned version of the Fi 103 aka V1. It would be a 99% suicide mission, with a slight chance of bailing out shortly before impact, not being hit by the pulse jet just above and behind the cockpit, and parachuting down onto the attack site. Carrier planes would mount and carry one or two of them to extend the range.
The U-Boote surfaced near the coast would be an amalganation of several plans to fire on the continental USA with a Fi 103/V-1 (foundered due to interservice rivalry) and the Aggregat 4. The A4 would be placed inside a 500 ton carrier/launch container, to be towed towards the US coast by a submarine. Ballast tanks would turn the container from horizontal to vertical, the missile would be checked, tanked up and launched. No A4 was ever towed towards the US.
7. Terrain mapping is a cruise missile technique, and totally useless for
a ICBM.
- ICBM: *B*allistic. Not "Steered".
- in vacuum: needs reaction engines to alter the trajectory, wings do not work in vacuum. Additional complexity, mass, error sources.
- a 90m drop in terrain, starting from 10m above ground, is a change of 1000%. From 100km up, it's 0.08%
- From 100 km up, you need 1.6 billion(!) times the energy to get the same radar return strength than if flying at 500m.
- ICBMs don't have engines running all through the flight, which could power the radar. They need something light and compact, like batteries. This means radar is out.
- where you dee 20m² from 100m height, you see 19.6km² from 100km height with the same antenna. That is too large to use terrain mapping.
- ICBMs tend to fly long distances over water, which does not allow terrain mapping.
- During reentry the reentry blackout stops any terrain radar --- and the blackout will likely be a few minutes.
- A reentry capsule has only very limited course correction capabilities.
- Using a star tracker is easier, cheaper, lighter, passive, less energy intensive, works over water and cannot be jammed. Civilian single-band GPS accuracy is 10-15m and a bit worse in height.
- The acceptable accuracy for nukes is kilometres.
8. Weight of the A4
The A4 did not have a reentry capsule. It had therefore to be built in a way to survive complete up to the impact, making it unnecessarily heavy. A "reentry vehicle" would have reduced the total weight, allowing a larger warhead or more range.
9. Creating a TPS (Termal Protection System) today is not that difficult.
There are patents, old and new, readily available on the Internet (and North Korea will not listen to patent lawyers). Lots of papers, too, old and new. E.g. research into cork granules + phenolic resin for heat shields --- effective and light weight. Produced commercially. And have been used on the Space Shuttle boosters and Delta rockets.
10. Accuracy problem:
- They will have enough accuracy for a nuke. Especially one many times stronger than Fat Man or Tall Boy.
- Sub launchable missiles (which North Korea has) havge much less distance to travel, and therefore will be more accurate.
- Diesel/Electrosubs can be extremely silent, basically invisible withouot active search. Active search, of course, has it's own disadvantages. Some US aircraft carriers have been successfully torpedoed and "sunk" in maneuvers. Others had the sub surface right next to them on top of it --- unnoticed until then.
11. Miniaturizing nuclear weapons.
If the images of the hydrogen nuke Mr. Kim stood at are somewhat accurate by size, they have the miniaturization.
12. Reentry stress and nukes
Nukes are pretty sturdy. No moving parts, either (except Tall Boy). The acellerations of launch and reentry will not hurt them, only heat or vessel breakup could. That's why you have a heat shield. Since the capsule will be much lighter per front area compared to, say, an Apollo capsule, it will slow down much faster, needing much less of a heat shield.
13. Triggering
A simple barometric switch, a timer, an accellerometer ... all can trigger either dropping the heatshield and turning on a height measuring radar or simply the explosion itself, if you want to be crude.
14. The "rocket broke up"
Are you sure you see what you think you see? It could well be that what broke up is the rocket --- except for the rentry capsule. You wouldn't necessarily be able to distinguish between some random, broken part of the rocket and an intact reentry capsule.
15. EMP strikes need no reentry
For an EMP strike against the USA you want to detonate at ca. 400km height. And for a good effect 10 kilotons will be plenty, especially if the bomb is optimized for it, according to experts heard at the relevant subcomitee of the congress in 1999-10-07. Yield is only loosely coupled to EMP strength. (And we know North Korea has atom bombs well above 10kT.)
15. Countermeasures
It's like the assassins and the bodyguards. The bodyguards fail if even a single assassin survives --- and the assassins need to get lucky only once. Patriot is not exactly 100% effective against Scuds, but at least battle tested.
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