1-7 Chapter Summary an airplane.  [Figure 1-12]  Therefore, the helicopter has  very little pitch deflection up or down when the helicopter  is stable in a flight mode. The variation from absolutely  level depends on the particular helicopter and the horizontal  stabilizer function.  Increasing collective (power) while maintaining a constant  airspeed induces a climb while decreasing collective causes  a descent. Coordinating these two inputs, down collective  plus aft cyclic or up collective plus forward cyclic, results  in airspeed changes while maintaining a constant altitude.  The pedals serve the same function in both a helicopter  and a fixed-wing aircraft, to maintain balanced flight. This  is done by applying pedal input in whichever direction is  necessary to center the ball in the turn and bank indicator.  Flight maneuvers are discussed in greater detail throughout  Chapter 9, Basic Flight Maneuvers. This chapter gives the reader an overview of the history  of the helicopter, its many uses, and how it has developed  throughout the years. The chapter also introduces basic terms  and explanations of the helicopter components, sections, and  the theory behind how the helicopter flies. 