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Old 7th Nov 2012, 15:34
  #12 (permalink)  
bigoil
 
Join Date: May 2006
Location: France
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On the PT6 the compressor is (air coupled) to the power turbine, hence the term free. You can turn the prop which spins the power turbine but the compressor doesn't turn. Or you can motor the engine with the starter and hold the prop.
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