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July 5, 2017

North Korea supposedly launched an ICBM, the Hwasong-14 to 2800km apogee on Jul4

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  3. North Korea supposedly launched an ICBM, the Hwasong-14 to 2800km apogee on Jul4
Darkman124 48 minutes ago#1
I am skeptical of all of this. The missile was 2-stage, video released by state media suggesting 4-nozzle first stage. Probably hydrazine base.

What all this means is 'butt-load of inert mass'. Generally for a long range missile/space launch rocket you want a 3-stage system to cut down on the inert mass which in turn allows for greater acceleration at the higher stages.

It's a modification of an 18m long, 1.8m wide missile and seems to be based on a soviet IRBM that had less than half the range that DPRK is claiming. While that missile was half as long, there are severe diminishing returns on a 2-stage missile. Past a certain operational acceleration profile, you just don't really get much more out of adding length to the system; you're adding fuel to accelerate additional mass and the system barely breaks even.

The idea that it would double the range of a missile by doubling its length seems highly unlikely to me.
And when the hourglass has run out, eternity asks you about only one thing: whether you have lived in despair or not.
KiwiTerraRizing 47 minutes ago#2
Trump won't do anything. He's a coward.
Jake Peralta: World's Grossest Pervert
COVxy 44 minutes ago#3
KiwiTerraRizing posted...
Trump won't do anything. He's a coward.


Wtf is this?

There's enough topics on this board to s***post about Trump in. This kinda isn't one of them.
=E[(x-E[x])(y-E[y])]
lilORANG 44 minutes ago#4
The mass is inert
Mars ain't the kind of place to raise your kids.
DevsBro 44 minutes ago#5
Could be that they're just using what's available, like those famous cubans who floated a pickup truck across to Florida.
Darkman124 44 minutes ago#6
yeah i dont think this is about trump at all
And when the hourglass has run out, eternity asks you about only one thing: whether you have lived in despair or not.
Were_Wyrm  awake to mic40 minutes ago#7
If they can put a man on the sun surely they can double the range by doubling the missile length.
I was a God, Valeria. I found it...beneath me. - Dr. Doom
http://i.imgur.com/9gYddqW.jpg
RE_expert44 39 minutes ago#8
North Korea embellish a feat of theirs? No...
Darkman124 38 minutes ago#9
RE_expert44 posted...
North Korea embellish a feat of theirs? No...


basically my thoughts

given we have the ability to track it i am wondering when we will be disputing their claims
And when the hourglass has run out, eternity asks you about only one thing: whether you have lived in despair or not.
GOATTHlEF 38 minutes ago#10
You assured me last month that this was likely well beyond their capabilities.
The best way to get back on your feet is to get up off your ass.
RE_expert44 37 minutes ago#11
I'm shocked they haven't made a claim that they went to mars or the moon yet.
That_Happened 36 minutes ago#12
lilORANG posted...
The mass is inert


It doesn't make a bit of difference, guys.
Darkman124 36 minutes ago#13
GOATTHlEF posted...
You assured me last month that this was likely well beyond their capabilities.


and it likely still is
And when the hourglass has run out, eternity asks you about only one thing: whether you have lived in despair or not.
WizardofHoth 29 minutes ago#14
That the best that North Korea could do on the 4th of July by sending a missile to Alaska?


Seriously?
COVxy 27 minutes ago#15
So you're thinking it's all hot air?

Interesting though. I mean, of course they are one for propaganda, but it's always seemed to me that despite massive failures, their rocket tests have always been in full view.
=E[(x-E[x])(y-E[y])]
Darkman124 26 minutes ago#16
COVxy posted...
So you're thinking it's all hot air?

i'm thinking that they launched an extra-long R-27 and are overstating the apogee achieved
And when the hourglass has run out, eternity asks you about only one thing: whether you have lived in despair or not.
(edited 26 minutes ago)reportquote
thronedfire2 26 minutes ago#17
Don't they know girth is more important?
I could see you, but I couldn't hear you You were holding your hat in the breeze Turning away from me In this moment you were stolen...
scar the 1 6 minutes ago#18
What I heard on NPR was that the missile reached higher than the ISS, and that if you flattened the trajectory it would reach Alaska. Although, of course, I'm not sure if it would go as far if it had to go lower in the atmosphere. What do you think, Darkman? Or is it not that simple?

Darkman124 posted...
i'm thinking that they launched an extra-long R-27 and are overstating the apogee achieved

Oh ok nm
Everything has an end, except for the sausage. It has two.
(edited 5 minutes ago)reportquote
Darkman124 1 minute ago#19
scar the 1 posted...
What I heard on NPR was that the missile reached higher than the ISS, and that if you flattened the trajectory it would reach Alaska. Although, of course, I'm not sure if it would go as far if it had to go lower in the atmosphere. What do you think, Darkman? Or is it not that simple?


1) missiles less than 10% the size of this one reach higher than the ISS. it is in LEO at 400km. this was supposedly 7x that.
2) if the altitude is real, yes it would reach alaska which is ~5700km from NK. it's a bit more complex than flattening the trajectory, more akin to an elliptical arc with a defined 'optimum' apogee for max range, but capable of going to higher apogees for less range
And when the hourglass has run out, eternity asks you about only one thing: whether you have lived in despair or not.
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