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"I don't think torque is constant."

The torque is constant for the first 40% of the RPM, something like this:

http://image.motorcyclistonline.com/f/30634938/122_0910_03_z... http://www.global-greenhouse-warming.com/images/TeslaTorqueg...

The horse power increases gradually as RPM increases.

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Interesting. Do they do that on purpose or is it due to how the motor works? It's so flat that It seems like they limit the torque on purpose, perhaps to prevent breaking things.

The almost perfect linear decline after the constant part is what I would have expected for an electric motor running with a constant power.

They almost certainly are limiting the torque. Zero rpm torque on these electric motors goes asymptotic since torque is power per change of angle and the angle isn't changing.

Also he specified max torque was 10k newton meters which is absolutely enough to pull a steel driveshaft like taffy. That's triple the torque a semi produces.

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