text: Of greater general interest in climb per- 
  formance are the factors which affect the rate of 
  climb. The vertical velocity of an airplane 
  depends on the flight speed and the inclination 
  of the flight path. 
  In fact, the rate of climb 
  is the vertical component of the flight path 
  velocity. By the diagram of figure 2.21, the 
  following relationship is developed: 
  
  RC- 101.3 V sin y 
  since 