Civil Turbofan Technology to the Year 2000

The aero gas turbine has been in commercial service now for a little over 30 years. Pioneering experience on the Dart/Viscount and Ghost/ Comet led to transatlantic commercial turbojet operation in late 1958—just over a quarter of a century ago. Over this period of time, the fuel usage per seat mile for typical long range operation has been reduced by no less than two‐thirds (Figure 1).