I have a chart that shows the correlation between torque and rotational speed for a DC-motor: The chart can be viewed here: http://www.miteget.net/donniebrasco9/gfx/brugerupload/68640PC(2).PDF The motor is inside an actuator, which is used to control the pitchangle of a rotor blad on a wind turbine. For those who do not know what "pitchangle" is, I can inform that pitching of a wing just means rotation of a wing around its length-axis. My question is: What is the chart used for? What can you deduce from this chart? And what relevant information can be deduced when the motors purpose is taken into consideration?