text: PrPs=parasite power required corresponding to 
  
  Thus, induced power required will vary with 
  lift, aspect ratio, altitude, etc., in the same 
  manner as the induced drag. The only differ- 
  ence will be the variation with speed. If all 
  other factors remain constant, the induced 
  power required varies inversely with velocity 
  while induced’drag varies inversely with 
  the 
  square of the velocity. 
  
  some different speed, I’, 
  
  For example, if an airplane in steady flight is 
  operated at twice as great a speed, the parasite 
  drag is four times as great but the parasite 
  times the original 
  ~;;zr  required is eight 
  
  Figure 2.1 presents the thrust required and 
  power required for a specific airplane configu- 
  ration and altitude. The curves of figure 2.1 
  are applicable for the following airplane data: 
  
  gross weight, W= 15,000 Ibs. 
  span, b=40 ft. 
  equivalent parasite area, f=7.2 sq. ft. 
  airplane efficiency factor, c= ,827 
  sea level altitude, C= 1.000 
  compressibility corrections neglected 
  
  For example, if an airplane in steady level flight 
  is operated at.twice as great a speed, the in- 
  duced drag is one-fourth the original value but 
  the induced power required is one-half the 
  original value. 