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Post by Count Zero on Aug 10, 2005 15:45:46 GMT -4
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Post by JayUtah on Aug 11, 2005 18:55:00 GMT -4
I've had conversations with Frank Pullo. He was the ascent stage assembly foreman.
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Post by Obviousman on Aug 13, 2005 22:32:08 GMT -4
Jay, I've sent an e-mail to Mr Pullo asking this, but maybe you know.
As you are aware, Jack White says there is a shadow on the Apollo 11 LM egress door which indicates use of external lighting. I pointed to other images which show that the door was a 'two-tone' colour, and the 'shadow line' is the deliniation between the colours.
Problem is that it seemed to be used on LM-5 only, and I don't know why it was there.
Any idea?
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Post by scooter on Aug 14, 2005 10:32:08 GMT -4
That is an excellent site.
It clearly shows (implies) that virtually everything you see of the LM in flight is covering, sheeting and wrapping...all the "structure" is inside and unseen.
Buily for the moon. Flimsy? Yes. Mission designed? Obviously.
Dave
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Post by JayUtah on Aug 14, 2005 23:04:26 GMT -4
Problem is that it seemed to be used on LM-5 only, and I don't know why it was there.
I don't either. I hope Frank has the answer.
The lunar module's outer skin was made from two grades of aluminum alloy, one from the 5000 series and another from the 2000 series. I could go look up the precise formulas, but generally the 2000 series alloys with copper and is a sort of standard high-strength aerospace material due to its high resistance to fatigue. The 5000 series alloys with magnesium and is generally stiffer and lighter (for the same strength). Most of the ascent stage's skin is 5000-series.
Nearly all aluminum used in aerospace is anodized or coated in some fashion, especially if Florida is involved in any way (warm salt spray eats aluminum for breakfast). The black parts are 5000-series with a special thermal paint. The front hatch skin is 2000-series sheet, probably acid-anodized. But on the filter side (Aldrin's side) of LM-5 it looks like there's an additional half sheet of the same anodized (not painted) 5000-series sheet that appears most everywhere else.
Why? I haven't the faintest idea.
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Post by Data Cable on Aug 14, 2005 23:55:24 GMT -4
The lunar module's outer skin was made from two grades of aluminum alloy, one from the 5000 series and another from the 2000 series. I could go look up the precise formulas... According to Virtual LM, 5056 and 2024. |
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Post by Obviousman on Aug 15, 2005 0:16:55 GMT -4
Ah well - thanks for the help anyway.
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Post by JayUtah on Aug 15, 2005 0:28:23 GMT -4
Hm, I'm not even sure we use 5056 anymore. 5052, on the other hand...
If I had my materials handbooks handy (pun intended) then we could look up 5056 and 2024 and get the exact mixture formulas -- how much of each constituent material is included -- and all the mechanics values for use in engineering calculations.
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