At 15:19 1/8/2002 -0600, you wrote:
>Seems like there was a rule of thumb - so many square inches of surface area
>(aluminum)  would give so many degrees C per watt.  This is the kind of
>thing I used to keep an old ARRL handbook around for, but I've long since
>lost track of it.  ...

Hi Lawrence,

My ARRL Handbook gives thermal conductivities of vatrious materials. For
Aluminum: 200 in k = Watt/degree C meter, for steel 48. You can calculate
thermal resistance by L/kA;  L is the length of the block, A is the area of
the block.

Hope this helps.

Chuck


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