Ud i rummet

[lindhardDeltager Super Nova]

DRs hjemmeside skriver om det nyligt affyrede nordkoreanske missil

“Missilet blev sendt 2.802 kilometer op i luften.”

Det kan vel næppe være korrekt. Ellers kan de da uden problemer ramme ISS

http://www.dr.dk/nyheder/udland/missiltruslen-fra-nordkorea-saa-langt-kan-de-naaLindhard2017-07-04 23:21:50

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mvh
Lars

[jesper.l.f.Deltager Asteroid]

Det skal nok passe, et amerikansk Minuteman missil er ude at vende i 1200 km.

https://en.wikipedia.org/wiki/LGM-30_Minuteman

Nordkorea har formentlig sendt det relativt højt og stejlt op og ned for at undgå overflyvning af andre landes landområder, det Japanske Hav afgrænses af Rusland, Kina og Japan og er ikke et ret stort testområde til dette formål…

[Bjørn SandåkerDeltager Neutron star]

På norsk TV sagde de 2500 meter … uden at det blev rettet op senere. Forrige gang Nord-Korea sendte op en raket var der også tale om nogle få meter i vores nyheder … Bjørn Sandåker2017-07-05 08:48:07

Mvh,
Bjørn

[juicy6Deltager Moon]

Wiki:

The following flight phases can be distinguished:

boost phase: 3 to 5 minutes; it is shorter for a solid-fuel rocket than for a liquid-propellant rocket; depending on the trajectory chosen, typical burnout speed is 4 km/s, up to 7.8 km/s; altitude at the end of this phase is typically 150 to 400 km.

midcourse phase: approx. 25 minutes—sub-orbital spaceflight with a flightpath being a part of an ellipse with a vertical major axis; the apogee (halfway through the midcourse phase) is at an altitude of approximately 1,200 km; the semi-major axis is between 3,186 and 6,372 km; the projection of the flightpath on the Earth’s surface is close to a great circle, slightly displaced due to earth rotation during the time of flight; the missile may release several independent warheads and penetration aids, such as metallic-coated balloons, aluminum chaff, and full-scale warhead decoys.

reentry/terminal phase (starting at an altitude of 100 km: 2 minutes – impact is at a speed of up to 7 km/s(for early ICBMs less than 1 km/s); see also maneuverable reentry vehicle.

ICBMs usually use the trajectory which optimizes range for a given amount of payload (the minimum-energy trajectory); an alternative is a depressed trajectory, which allows less payload, shorter flight time, and has a much lower apogee

[Torben TaustrupAdmin Neutron star]

Når det bare er en test, så er der vel ikke noget i vejen for at sende

den helt lodret, så den lander i Nordkorea igen?

TOC Observatory - "http://tocobs.org -14.5″ – f:4,2 Newt - Atik383 - ZWO2600-mono – SXV H9 - QHY8L-color - SkyWatcher 80 mm ED refraktor - 60 mm F:6 apocromat - TAL Apolar 125 f : 7,5.

[pv Moon]

Fremgår der noget om skæbnen på dyret? (Missilet, ikke diktatoren 😉

Såfremt det måtte have været ude i den højde

vil det naturligvis være brændt op ved genindtræden i atmosfæren.

[juicy6Deltager Moon]

Varför det? Varje laddning är försedd med liknande skydd som varje rymdkapsel eller rymdfärjorna haft. Ofta ett tjockt lager av keramik som motstår värmen från friktionen mot luft. Det här är ju teknik som är mer än 50 år gammal. ICBM har funnits länge. Två minuters Googling visar: “As the nuclear warhead reenters the Earth’s atmosphere its high speed causes friction with the air, leading to a dramatic rise in temperature which would destroy it if it were not shielded in some way. As a result, warhead components are contained within an aluminium honeycomb substructure, sheathed in pyrolytic graphite-epoxy resin composite, with a heat-shield layer on top which is constructed out of 3-Dimensional Quartz Phenolic.”Juicy62017-07-05 19:39:19

[JuliusDeltager Nova]

God forklaring på Nordkorea sine raketter:
http://www.youtube.com/watch?v=1g9j_ZkuJig

For spesielt interesserte:
http://en.wikipedia.org/wiki/Hwasong-14
http://www.nrk.no/urix/pentagon_-_-vi-har-aldri-sett-denne-typen-rakett-for-1.13590314

MrJulius2017-07-05 21:43:07

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