Here's the Ohmite resistor guide web page: 
http://www.ohmite.com/resguide.html

73,
Dave KQ3T


Craig D. Smith wrote:
> Hi Vic ...
>
> My first inclination would be to go to the Ohmite website and look at the
> datasheet for the resistors and search for any application notes.  One or
> both of these sources should address, at least in relative terms, how much
> heat is typically removed via conduction through the leads vs. from the body
> of the resistor.  At these power levels, thermal considerations must have
> been part of the mechanical package design of the device.  If you are lucky,
> you will find something like a graph of thermal resistance through the leads
> vs. PCB trace area, airflow or some other variable under your control.  Good
> luck!
>
>            ... Craig  AC0DS
>
>   

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