text: This particular control requirement can be 
  in supersonic 
  is usually accom- 
  
  most critical 
  flight. 
  panied by large increases in static longltu- 
  dinal stability and a reduction in the effective- 
  ness of control surfaces. In order to cope with 
  these trends, powerful all-movable surfaces 
  load factor or 
  must be used to attain 
  maximum usable C, in supersonic flight. This 
  requirement is so important 
  that once satis- 
  fied, the supersonic configuration usually has 
  sufficient longitudinal control power for all 
  other conditions of flight. 
  
  for an airplane 
  
  Supersonic flight 
  . 
  
  The various tab devices have almost un- 
  limited possibilities for tailoring control forces. 
  However, these devices must receive proper 
  care and maintenance in order to 
  function 
  In addition, much care must be 
  properly. 
  taken to ensure that no slop or play exists in 
  the joints and fittings, otherwise destructive 
  flutter may occur. 
  
  TAKEOFF CONTROL REQUIREMENT. 
  At takeoff, the airplane must have sufficient 
  control power to assume the takeoff attitude 
  to reaching takeoff speed. Generally, 
  prior 
  for airplanes with 
  tricycle landing gears, it 
  is desirable to have at least sufficient control 
  the takeoff attitude at 80 
  power to attain 