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I recently used a surplus windshield wiper motor in a drum coffee
roaster application. The drum has an 11 inch diameter, and the motor
can reliably do about 5 pounds of coffee beans. It's coupled with a
pulley that's almost 1:1 just now.

The drum has agitation vanes inside which are optimized to keep the
beans tossing about, but the simple picture is that they're being
lifted on a 5" radius (on average).

The drum's size easily allows for a 10 - 12 pound batch, but the motor
I've been using can't handle that at all.

What this layman needs is a bit of guidance on how to understand what
kind of torque specifications I should look for in a gearmotor that
will do the trick.

I'd be glad of any tips!

TIA

- S