text: NAVWEPS OO-ROT-80 
  STABILITY AND CONTROL 
  
  In any system, the existence of static sta- 
  the 
  does not necessarily guarantee 
  However, 
  implies 
  
  bility 
  existence of dynamic stability. 
  the existence of dynamic stability 
  the existence of static stability. 
  
  Any aircraft must demonstrate the required 
  degrees of static and dynamic stability. 
  If 
  the aircraft were allowed to have static in- 
  stability with a rapid rate of divergence, the 
  not impos- 
  aircraft would be very difficult-if 
  fly. The degree of difficulty would 
  sible-to 
  compare closely with 
  learning to ride a uni- 
  In addition, positive dynamic stability 
  cycle. 
  is mandatory 
  objectionable continued oscillations of 
  aircraft. 
  
  TRIM AND CONTROLLABILITY 