text: The specific fuel consumption of the turbo- 
  
  prop powerplant is defined as follows : 
  
  specific fuel consumption= 
  
  engine fuel flow 
  equivalent shaft horsepower 
  
  c=lbs. per hr. 
  
  ESHP 
  
  Typical values for specific fuel consumption, c, 
  range from 0.5 to 0.8 lbs. per hr. per ESHP. 
  The variation of specific fuel consumption with 
  operating conditions is similar to that of the 
  turbojet engine. The minimum specific fuel 
  consumption is obtained at relatively high 
  power setting and high altitudes. The low 
  inlet air temperature reduces the specific fuel 
  consumption and the lowest values of c are ob- 
  tained near altitudes of 25,ooO to 3900 
  ft. 
  Thus; the turboprop as well as the turbojet has 
  a preference for high altitude operation. 
  
  THE RECRIPROCATING ENGINE 