text: moment, and (4) usually a reduction in static 
  source pressure and increase in indicated air- 
  speed. These general effects should point out 
  the possible danger in attempting 
  takeoff 
  prior 
  to achieving the recommended takeoff 
  speed. Due to the reduced drag in ground 
  effect the airplane may seem capable of takeoff 
  below the recommended speed. However, as 
  the airplane rises out of ground effect with a 
  deficiency of speed, the greater induced drag 
  may produce marginal initial climb perform- 
  ance. 
  In the extreme conditions such as high 
  gross weight, high density altitude, and high 
  temperature, a deficiency of airspeed at takeoff 
  may permit the airplane to become airborne 
  but be incapable of flying’out of ground effect. 
  In this case, the airplane may become airborne 
  initially with a deficiency of speed, but later 
  settle back to the runway. 
  is imperative 
  that no attempt be made to force the airplane 
  to become airborne with a deficiency of speed; 
  the recommended takeoff speed is necessary to 
  provide adequate initial climb performance. 
  In fact, ground effect can be used to advantage 
  if no obstacles exist by using the reduced drag 
  to improve initial acceleration. 
  
  It 
  
  The results of the airplane leaving ground 
  effect can be most easily realized during the 
  deck launch of a heavily loaded airplane. As 
  the airplane moves forward and passes over the 
  edge of the deck, whatever ground effect exists 
  will be lost immediately. Thus, proper rota- 
  tion of the airplane will be necessary to main- 
  tain the same lift coefficient and the increase 
  in induced drag must be expected. 