Pratt & Whitney Canada PT6A-34 Rated at 750 shp up to ISA+7C for takeoff and up to 700 shp in cruise, the -34 is a member of the smallest and oldest PT6A family. As with all PT6A turboprops, it’s a tandem configuration, twin-spool, reverse-flow engine. The gas generator at the rear has a three-stage, axial-flow and single-stage centrifugal-flow compressor that feeds air to a single, reverse flow annular combustor. Compression ratio is a modest 7:1. At the center of the engine, ...

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