text: The propeller airplane at takeoff power may 
  induce considerable slipstream velocity at the 
  horizontal tail which can provide an increase 
  in 
  jet 
  airplane does not experience a similar magni- 
  tude of this effect since the induced velocities 
  from the jet are relatively small compared 
  to the slipstream velocities from a propeller. 
  LANDING CONTROL REQUIREMENT 
  At landing, the airplane must have suthcient 
  control power to ensure adequate control at 
  specified landing speeds. Adequate landing 
  control is usually assured if the elevators are 
  capable of holding 
  the airplane just off the 
  runway at 105 percent of the stall speed. Of 
  course, the most critical requirement will exist 
  when the c.g. is in the most forward position, 
  
  the e&iency  of  the surface. The 
  
  In some cases the effectiveness of the control 
  surface is adversely affected by the use of trim 
  If trim tabs are used to excess in ttim- 
  tabs. 
  the 
  forces, the effectiveness of 
  ming stick 
  elevator.may be reduced to hinder landing or 
  takeoff control. 
  
  Each of the three principal conditions re- 
  quiting adequate longitudinal control are ctit- 
  ical for high static stability. 
  If the forward 
  is exceeded, the airplane may en- 
  c.g. limit 
  in any 
  counter a deficiency of controllability 
  of these conditions. Thus, the forward c.g. 