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DaveTrojan

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 #1 
Found this bright green colored heavy metal bar at U-2G 56-6715 crash site North Edwards CA.
could it be depleted Uranium?  or is it just copper? It was VERY heavy weight. could it be ballast for the U-2? It really stood out. I've never seen anything like it. it measured about 8 inches by about 1 inch thick square. 

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WaltW

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 #2 
My guess would be a surface balance weight.  I'd guess the material as Tungsten, which is heavier by density than lead and widely used for mass prior to DU.  Tungsten Oxides have several possible colors depending on humidity and other factors but Green, Yellow, and blends of them are common.

DU oxidizes to black.

I have yet to be to that site.  I have the coords but other matters have kept me out of the field.  I'm looking forward to getting out this spring and summer.

Walt
Xelex

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 #3 
That was one of the first items I found at that site when I located it last year.  It is a lead bar painted green. It was part of the "Glockenspiel," a ballast assembly that took the place of a sensor/camera payload during flights when no mission system was required. The "Glockenspiel" consisted of a bunch of lead ingots bolted to a steel A-frame.
DaveTrojan

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 #4 
A Glockenspiel is a percussion instrument composed of a set of tuned keys arranged in the fashion of the keyboard of a piano. Wikipedia
I assume that the lead bars were arraigned in the same way as the keys on this instrument. 
So the word of the day is "Glockenspiel". its not a German pastry, or a German Beer. Its a musical instrument or a Ballast Assembly depending on application. I learn something new everyday. 
But wait! 
U2 is an Irish rock band, and they may have used a Glockenspiel. So I get the U-2 = Glockenspiel connection. 
Now I understand...

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