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Old 17th November 2007 | 02:26
  #157 (permalink)  
Intruder
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Joined: May 2000
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From: Seattle
Another reason is a safety buffer, since it takes a LONG time for a CF6 (for example) to accelerate from 25% N1 to 40%.

There is also a consideration in some airplanes of reliably providing enough bleed air for all the systems airborne.
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