text: The performance of the turboprop illustrates 
  the typical advantages of the propeller-engine 
  combination. Higher propulsive efficiency 
  and high 
  thrust and low speeds provide the 
  characteristic of range, endurance, and takeoff 
  performance superior to the turbojet. As is 
  typical of all propeller equipped powerplants, 
  the power available is nearly constant with 
  speed. Because the power from the jet thrust 
  the power available in- 
  depends on velocity, 
  creases slightly with speed. However, 
  the 
  thrust available decreases with speed. The 
  equivalent shaft horsepower, ESHP, of the 
  turboprop is affected by mass ,flow and inlet 
  temperature in fashion similar to that of the 
  turbojet. Thus, the ESHP will vary with 
  the thrust output of the 
  altitude much like 
  turbojet because the higher altitude produces 
  much lower density and engine mass flow. 
  The gas turbine-propeller combination utilizes 
  a number of turbine stages to extract shaft 
  power from the exhaust gases and, as high 
  compressor inlet temperatures reduce the fuel 
  flow allowable within 
  temperature 
  limits, hot days will cause a noticeable loss of 
  output power. Generally, the turboprop 
  is 
  just as sensitive, if not more sensitive, to com- 
  pressor inlet air temperature as the turbojet 
  engine. 