Chapter 11 Transition to Complex Airplanes

11-1 IntroductionA high-performance airplane is defined as an airplane with an engine capable of developing more than 200 horsepower. A Complex airplane is an airplane that has a retractable landing gear, flaps, and a controllable pitch propeller. In lieu of a controllable pitch propeller, the aircraft could also have an engine control system consisting of a digital computer and associated accessories for controlling the engine and the propeller. A seaplane would still be considered Complex if it meets the description above except for having floats instead of a retractable landing gear to Complex Airplanes Chapter 1111-2 Figure 11-2.

Lift is a function of several variables including air density, velocity, surface area, and lift coefficient. Since flaps increase an airfoil’s lift coefficient, lift is increased. [Figure 11-3] As flaps are deflected, the aircraft may pitch nose up, nose down or have minimal changes in pitch attitude. Pitching

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