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As to Temperature effects...
Thermal mass helps the things stay cool in the short run but not in the long run because eventually the mass is the temp of the windings.
My first order analysis does not take the airflow into account which can be a big effect (as you will find out if your motor mounting design blocks the holes on the drill motor -- they run MUCH hotter with the holes blocked.
But, my basic point is still valid. Doubling the motor size more than halves the temperature rise inside a motor for a given amount of heat per second generated by the I^2R losses of the motor windings.
As to speed torque curves...
Download the FIRST MOTOR CALC spreadsheet from the whitepapers section of this website and you can plot them yourself -- all the data you need is the 4 numbers I gave you.
Joe J.
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