Performance Trends
Straight jet
Lowbypass
Mediumbypass
Highbypass
%sfc
improvement(bare engine)
50
40
30
20
10
Datum
Avon1958
Conway1960
Spey1963
-22B1973
-524B4/D41981
-535E41983
-524G/H1988
7001994
8001995
5002000
Propulsiveefficiency
Componentefficiency
Cycle efficiency
Thermalefficiency
RB211
Trent
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