This site deals with Direct Current permanent magnet motors operated at a constant voltage. Motor characteristics vary considerably from type to type, and their performance characteristics can be altered by the way electrical power is supplied. can be quite different than those covered here.
1 revolution = 360° 1 revolution = (2*p) radians 1 radian = (180/p)° 1° = (p/180) radians 
SI  English 
Watts {W} newtonmeters per second {N·m/s} 1 W = 1 N·m/s 1 W = 0.738 ft·lb/s 1 W = 1.341E03 hp 
footpounds per second {ft·lb/s} horsepower {hp} 1 ft·lb/s = 1.818E03 hp 1 ft·lb/s = 1.356 W 
The linear model of a D.C. motor torque/speed curve is a very good approximation. The torque/speed curves
shown below are actual curves for the green maxon motor (pictured at right) used by students in 2.007.
One is a plot of empirical data, and the other was plotted mechanically using a device developed at MIT.
Note that the characteristic torque/speed curve for this motor is quite linear. This is generally true as long as the curve represents the direct output of the motor, or a simple gear reduced output. If the specifications are given as two points, it is safe to assume a linear curve. 
