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Old 4th Jan 2013, 14:08
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barit1
 
Join Date: Feb 2005
Location: flyover country USA
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There are some methods (mostly theoretical) for reducing idle thrust in a turbofan. One I have seen proposed is a bleed valve between the HP and LP turbine. A beautiful concept, reducing the driving gas flow for the fan shaft system; but the implementation in that temperature/pressure environment requires a metallurgical breakthrough known as unobtainium.
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