text: The cffcct of nrnzuay slope on takeoff distance 
  is due to the component of weight along the 
  runway 
  inclined path of 
  slope of 1 percent would provide a force com- 
  ponent along the path of the airplane which is 
  1 percent of the gross weight. Of course, an 
  force 
  upslope would contribute a retarding 
  component while a downslope would contri- 
  bute an accelerating force component. For 
  the case of the upslope, the retarding force 
  component adds to drag and rolling friction to 
  reduce the net accelerating force. Ordinarily, 
  a 1 percent runway slope can cause a 2’tO 4 
  percent change in takeoff distance depending 
  on rhe airplane characrerisrics. The airplane 
  with 
  is least 
  affected while the airplane with the low thrust- 
  is most affected because the 
  to-weight 
  slope force component causes a relatively 
  greater change in the net accelerating force. 
  
  the airplane. A 
  
  The effect of runway slope must be consid- 
  ered when predicting the takeoff distance but 
  the effect is usually minor for the ordinary run- 
  way slopes and airplanes with moderate 
  thrust-to-weight ratios. 
  In fact, runway slope 
  considerations are of great significance only 
  when the runway slope is large and the airplane 
  has an intrinsic 
  low 
  low acceleration, i.e., 
  In the ordinary case, 
  ratio. 
  thrust-to-weight 
  the selection of the takeoff runway will 
  favor 
  the direction with an upslope and headwind 
  rather than the direction with a downslope 
  and tailwind. 