text: the 
  turboprop powerplant 
  “equivalent shaft horsepower.” 
  
  is rated by an 
  
  T,y 
  ESHP= BHP+325vp 
  
  where 
  
  ESHP=equivalent shaft horsepower 
  EHP= brake horsepower, or shaft horse- 
  
  power applied to the propeller 
  
  T,= jet thrust, lbs. 
  V=flight velocity, knots, TAS 
  ‘1s = propeller efficiency 