PPRuNe Forums - View Single Post - American twins,Brit triple spool engines?

7th Jun 2011, 19:42

#172 (permalink)

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Join Date: Dec 2003

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The single hp turbine powering the fan in a triple spool is not very efficient due to its Mach number being about 22% of its optimal RPM which makes it more difficult to increase the pressure ratio.

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