text: NAVWEPS 00401-80 
  AIRPLANE PERFORMANCE 
  
  mass to accelerate, and (3) increased retarding 
  If the gross weight increases, 
  force (D+F). 
  a greater speed is necessary to produce the 
  greater lift to get the airplane airborne at the 
  takeoff lift coefficient. The relationship of 
  takeoff speed and gross weight would be as 
  follows: 