Superb resource for calculation of heat flow in a zillion applications.
Applicable to electronics and rocketry (at least).

Online calculators plus underlying theory plus information from several
different solution providers.

        http://www.coolingzone.com/index.html

From main menu click on Design Corner menu item to get solutions for 4
providers viz

        http://www.coolingzone.com/Content/DesignCorner/index.html

One contributor has an encouraging 19 part series "Everything you know is
wrong" - all on thermal issues.
eg here's one on free air heat transfer from ICs to give an idea


http://www.coolingzone.com/Guest/News/NL_APR_2002/Tony/Apr_2002_TK.html


Note the application notes, tutorials and case studies

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Site found by Googling to see of my heatsink design was adequate.
It wasn't.

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