text: of climb but the airplane must be operated at 
  some increase of speed to achieve the ,smaller 
  peak climb rate (unless the airplane is compres- 
  sibility limited). 
  
  near the speed for (L/D&-. 
  There is no direct 
  relationship which establishes this situation 
  since the variation of propeller efficiency is the 
  principal factor accounting for the variation 
  of power available with velocity. 
  In an ideal 
  sense, if the propeller efficiency were constant, 
  maximum rate of climb would occur at the 
  speed for minimum power required. How- 
  ever, in the actual case, the propeller efficiency 
  of the ordinary airplane will produce lower 
  power available at low velocity and cause the 
  maximum rate of climb to occur at a speed 
  greater than that for minimum power required. 
  The power curves for the representative. jet 
  aircraft show the near linear variation of power 
  available with velocity. The maximum rate 
  of climb for the typical jet airplane will occur 
  at some speed much higher than that for max- 
  imum rate of climb of the equivalent propeller 
  powered airplane. 
  In part, this is accounted 
  for by the continued increase in power avail- 
  able with speed. Note that a 50 percent in- 
  increase in thrust by use of an afterburner may 
  cause an increase in rate of climb of approxi- 
  mately 100 percent. 