When an aircraft takes off, CFM engines start making the buzz-saw sound immediately and at a higher pitch while Rolls Royce Trent engines start making the buzz-saw sound after a couple of
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Rolls Royce in talks with Siemens over possible sale of compressor and gas turbine operations
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Compressor , Rolls-Royce Dart Turboprop | National Air and Space Museum
File:Gearbox, inlet and compressors of sectioned Rolls-Royce Dart turboprop 01.jpg - Wikimedia Commons