What Debris From North Korea's Rocket Launch Shows

I was wondering whether the analysis was just based on video frames (since they talked about the colors of the flames and such) in the "AllThingsNuclear.org" article. The
article [allthingsnuclear.org] itself says that the analysis is based upon four pieces of the first stage of the Unha-3 rocket recovered by South Korea. The author of the article, David Wright [allthingsnuclear.org], surmises that all four pieces came from the first stage because they "were found in the same area".
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The four parts found were:
1 -- oxidizer tank (made of an aluminum-magnesium alloy)
with a cool picture (fig 4) of the inside of the tank showing hoops and stringers supporting the wall
2 -- two bottles that make the "turbo pumps" to maintain pressure in the oxidizer tank as the fuel flow continues during launch
3 -- another part of the fuel tank (with the number "3" painted on the outside which is visible on the launch video)
4 -- what appears to be a support ring from the first stage body
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There's also a comment at the end about using "room temperature fuels" such as RFNA (red fuming nitric acid) allowing the use of a simplified design as compared to using cryogenic fuels which require a more complex design. Someone wrote in pointing out that RFNA is also used in the Russian Kosmos 3M [wikipedia.org] space launch vehicle which is also derived from a ballistic missile. In fact, even the fins and the profile of the Kosmos looks like the fins on and the profile of the North Korean launch rocket. Pretty cool analysis, and I like that the author puts really links to the sources of the pictures he has in the article.

Source: http://rss.slashdot.org/~r/Slashdot/slashdotScience/~3/CPzuCTeBdpg/story01.htm

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