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driven region, the driving region, and the stall region. Figure 3-22 shows four blade sections that illustrate force vectors. Part A is the driven region, B and D are points of equilibrium, part C is the driving region, and part E is the stall region. Force vectors are different in each region because rotational relative wind is slower near the blade root and increases continually toward the blade tip. Also, blade twist gives a more positive 

angle of attack in the driving region than in the driven region. The combination of the inflow up through the rotor with rotational relative wind produces different combinations of aerodynamic force at every point along the blade. 

The driven region, also called the propeller region, is nearest the blade tips. Normally, it consists of about 30 

<img src='content_image/599469.jpg'>

