Re: The Cold Equations


Jorge R. Frank wrote:
> Really? Where did "NASA" point that out? That 13-second number came from
> the CAIB, not NASA.

>>From my point of view, whether the "13 seconds" came from NASA or CAIB
is immaterial. My statements were an analysis, not NASA knocking.


> > Today, we know that 'steel' would have been the better choice.

> No, you don't "know" that. And stop using 'steel' as your codeword for
> titanium; we all know what your particular hobby-horse is. As Henry
> Spencer pointed out, titanium has poor thermal conductivity compared to
> aluminum. When exposed to localized heating, as in the case of Columbia,
> aluminum tends to spread the heat out a lot more, so although it has a
> much lower melting point, it tends to reach that melting point more
> slowly.

The X-15 program had a similiar problem. Certain fittings were made of
copper because copper was highly thermal conductive and would "spread
the heat out a lot more . . .". The copper, however, melted anyway.
Then they developed niconel X.

Put simply: Aluminum is not a good material for high temperature
applications.


tomcat

.

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