PPRuNe Forums - View Single Post - Hawker Siddeley Trident 3B and its fourth "booster" engine
Old 14th Apr 2023, 11:45
  #15 (permalink)  
dixi188
 
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I think the term Turbo Fan is not applicable to the RR Spey, it is a bypass engine. The front 4 or 5 compressor stages feed air into the core HP compressor or down a bypass duct.
A Turbo Fan engine has a single stage fan that feeds some air into the core compressors but most of the air goes down a fan air duct.
The RR Tay was a Fan development of the Spey.
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