15 Two 3

The buzzwords in clean power for jet planes today are Geared Turbofan (GTF) and Advanced Turbofan (ATF). But in 1989 when this award winning story was produced, everyone was talking about Ultra High Bypass (UHB) jet engines. General Electric (GE) was testing the Unducted Fan (UDF) and a team of Pratt & Whitney and Allison [...]

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