text: if all other 
  
  (A) Stall of this particular airplane occurs 
  at 100 knots and is indicated by a sharp rise 
  in the actual drag. Since the generalized iqua- 
  tions for induced and parasite do not account 
  for conditions at stall, the actual drag of the 
  of the 
  airplane is depicted by the “hook” 
  dotted line. 
  
  the exact relationship 
  
  As the flight speeds of aircraft approach the 
  speed of sound, great care must be taken to 
  delay and alleviate compressibility effects. 
  In order to delay and teduce the drag rise 
  associated with compressibility effects, the 
  components of the airplanes must be arranged 
  to reduce the early formation of shock waves 
  on the airplane. This will generally require  (B) At a speed of 124 knots, the airplane 
  would 
  incur a minimum rate of descent in 
  power-off flight. Note that at this speed the 
  induced drag comprises 75 percent of the total 
  drag. 
  If this airplane were powered with a 
  reciprocating-propeller type powerplant, maxi- 
  mum endurance would occur at this airspeed. 
  
  92 