Wing twists from root to tips Relative Wind Relative Wind Relative Wind A $_{O}$A high at Root A $_{$_{O}$A lo}$wer at m idpo int A $_{$_{O}$A lo}$w at tip Chord Line $_{Cho}$rd Line Chord Line Relative Wind Flightpath Relative Wind Flightpath Longitudinal Axis Longitudinal Axis CG CG Low Angle of Incidence High Angle of Incidence Control Bar Out—Slow Flight Control Bar In—Fast Flight Root Chord of Wing Control Bar Control Bar Root Chord of Wing Carriage Hang Point Carriage Hang Point Figure 2-7.  Angle of incidence. Figure 2-6.  Wing twist shown for a WSC wing in flight.  Unlike that of an airplane, the WSC angle of incidence has a  significant change in flight because the carriage is attached to  the wing, which allows the wing to rotate around the carriage  hang point on the wing and is controlled by the pilot as shown  in  Figure 2-7.  Pitch angle is the angle the WSC wing root chord (center  of wing) makes with the Earth’s horizontal plane. Many  pilots confuse the pitch angle, which is easily seen and felt,  with the angle of attack (AOA) which is not as perceptible.  For example, if flying in a glide with the engine idle and  the nose lowered, the pitch angle can be below the horizon.  Another example would be flying at full power climb with  the nose raised, resulting in the pitch angle being well above  the horizon.  [Figure 2-8]  Pitch angles are covered in greater  detail in chapter 6.   Deck angle is the angle of the cart’s wheel axles to the landing  surfaces, as in the powered parachute (PPC) deck angle.  Relative wind is the direction of the airflow with respect to  the wing; it is parallel to and opposite the WSC fl ightpath.  Relative wind may be affected by movement of the WSC  through the air, as well as by all forms of unstable, disturbed  air such as wind shear, thermals, and turbulence. When a  2-4