PPRuNe Forums - TF39 bypass ratio

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chornedsnorkack

2nd November 2008 09:21

TF39 bypass ratio

GE90 and Trent 900 supposedly have low SFC because they have higher bypass ratio than Trent 800 and other older high-bypass turbofans.

But the original high bypass turbofan, TF39, is supposed to have a bypass ratio as big as 8:1.

Why were next turbofans like TF39 derivative CF6 designed with low bypass ratios like 5:1...6:1? What was wrong with TF39?

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