text: Maximum specific endurance of the turbo- 
  prop airplane does not vary as greatly with 
  altitude as the turbojet airplane. While each 
  configuration has its own particular operating 
  requirements, low altitude endurance of the 
  turboprop airplane requires special considera- 
  tion. The single-engine turboprop will gen- 
  eraBy experience an increase in specific endur- 
  ance with an increase in altitude from sea level. 
  However, if the airplane is at low altitude and 
  must hold or endure for a period of time, the 
  decision to begin a climb or hold the existing 
  altitude will depend on the quantity of fuel 
  available. The decision depends primarily on 
  the climb fuel,requirements and the variation of 
  specific endurance with altitude. A somewhat 
  the multiengine 
  similar problem exists with 
  
  When engine failure produces a critical 
  improved perform- 
  in ;the clean 
  jetti- 
  
  power or range situation, 
  ance is possible with- theairplane 
  configuration at 
  soning of expendable weight items will reduce 
  the power required and improve the specific 
  range. 
  
  low altitude. Also, 
  
  173 