PPRuNe Forums - View Single Post - American twins,Brit triple spool engines?
Old 12th Mar 2011, 19:04
  #73 (permalink)  
bearfoil
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Loss of performance is basically just a loosening of the tolerances in the erm....gas path. Tip clearance allows leaks around what must remain a dynamic gas tight seal, or loss of compression occurs, (energy).

I think.