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starship-design: Radiation Shielding

Hi Kelly,

Sorry for the question, but I just read your web page about crew 
quarters and radiation shielding. There is a table in which you give the 
following mass numbers:

Forward bulkhead             35,995 tons
Rear bulkhead                35,995 tons
Outer Circumference          27,646 tons

This adds up to 99,636 tons. The two bulkheads together give 71,990 
So, where do you get your total mass of 72,017 tons from?

What have I missed????


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