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Old 1st Jan 2011, 15:10
  #49 (permalink)  
twochai
 
Join Date: Jan 2008
Location: On the lake
Age: 78
Posts: 662
As my previous NASA clip suggests, a jet engine requires to slow down the gasses as they pass through the compressor

The compressor is accelerating the air into the combustion chamber, not slowing it down when the aircraft is static, or at at slow speed. 'Inlet drag' becomes a factor at higher Mach numbers, I believe.
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