Abstract
RECENT developments have high‐lighted the increasing growth in thrust requirements as airlines anticipate greater passenger loads over very long ranges. In the 1990's the major engine manufacturers will be supplying not only the most powerful turbofans ever seen but also the most efficient that will provide a fuel consumption per seat mile some 25 to 30% better than in many current aircraft. In the forefront of this advancing technology is Rolls‐Royce whose RB 211 engines are being developed for thrust in excess of 72,000 lb. The RB 211–524G of 58,000 lb will power the Boeing 747–400, which engine was certificated earlier this year and will enter service in 1989. British Airways has selected the RB 211–524H of 60,600 lb thrust for its Boeing 767's and another version of the powerplant, the ‐524J, is directed at increased weight versions of this aircraft. It will retain the same core as the ‐524G and H but will have increased flow and improved efficiency leading to a rating of 63,000 lb thrust.
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