text: For the airplane with a high thrust-to-weight 
  the increase in takeoff distance would 
  ratio, 
  be approximately 21 to 22 percent but, for 
  the airplane with a relatively 
  low thrust-to- 
  *eight 
  ratio, the increase in takeoff distance 
  would be approximately 25 to 30 percent. 
  Such a powerful effect requires proper con- 
  sideration of gross weight in predicting takeoff 
  distance. 
  
  As a .result of this relationship, a headwind 
  wh,ich is 10 percent of the takeoff airspeed will 
  reduce the takeoff distance 19 percent. How- 
  ever, a tailwind (or negative headwind) which 
  in- 
  is 10 percent of the take05 airspeed will 
  crease the takeoff distance 21 percent. 
  In the 
  case where the headwind velocity is 50 percent 
  of the takeoff speed, the takeoff distance would 
  be approximately 25 percent of the zero wind 
  takeoff distance (75 percent reduction). 
  
  The effect of wind on takeoff distance is large 
  and proper consideration also must be provided 
  when predicting takeoff distance. The effect 
  of a headwind is to allow the airplane to reach 
  the takeoff velocity at a lower ground velocity 
  while the effect of a tailwind 
  is to require the 
  airplane to achieve a greater ground velocity 
  to attain the takeoff velocity. The effect of 
  the wind on acceleration is relatively small 
  and, for the most part, can be neglected. To 
  evaluate the effect of wind on takeoff distance, 
  the following relationships are used: 