text: to provide 
  greater deceleration-of the airplane or to mini- 
  mize the wear and teat on tires and brakes. 
  ‘The drag parachute can provide a large retatd- 
  ing force at high 4 and greatly increase the de- 
  celeration during the initial phase of landing 
  toll. 
  It should be noted that the contribution 
  of the drag chute is important only during the 
  high speed portion of the landing roll. 
  For 
  maximum effectiveness, the drag chute must be 
  deployed immediately after the airplane is in 
  the runway. Reverse thrust of 
  contact with 
  
  Various devices can be utilized 