High Bypass

Some articles on high bypass, bypass, high:

Supersonic Transports - Challenges of Supersonic Passenger Flight - Engines
... When Concorde was being designed by Aérospatiale–BAC, high bypass jet engines ("turbofan" engines) had not yet been deployed on subsonic aircraft ... When these high bypass jet engines reached commercial service in the 1960s, subsonic jet engines immediately became much more efficient, closer to the efficiency of turbojets at supersonic speeds ... using some of the energy normally used to accelerate hot air in the classic non-bypass turbojet ...
Turbofan
... air passing through the core is referred to as the bypass ratio ... thrust relative to fan thrust are known as low bypass turbofans, while those that have considerably more fan thrust than jet are known as high bypass ... Most commercial aviation jet engines in use today are of the high-bypass type, and most modern military fighter engines are low-bypass ...

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