text: The specific fuel consumption of the turbojet 
  engine is strongly affected by operating RPM 
  and altitude. Generally, the turbojet engine 
  prefers the operating range near normal rated 
  engine speed and the low temperatures of the 
  stratosphere to produce low specific fuel con- 
  sumption. Thus, increased altitude provides 
  the favorable lower inlet air temperature and 
  requires a greater engine speed to provide the 
  thrust 
  typical 
  turbojet airplane experiences an increase in 
  specific endurance with altitude with the peak 
  values occurring at or near the tropopausc. 
  For example, a typical single-engine turbojet 
  
  required at  (L/D)-.  The 
  
  The failure of an engine on the multiengine 
  reciprocating powered airplane has interesting 
  ramifications. The first problem appearing is 
  to produce sufficient power from the remaining 
  engines to keep the airplane airborne. The 
  
  172 