How does the Pratt & Whitney Canada PT6 differ from other turboprop engines?
Split Shaft

Several turboprop engines, including the PT6 turboprop engine, use an epicyclic gearbox only, many other turboprop engines use a multishaft gearbox. The latter usually results in the propeller axis being offset from the turbine axis.

In common with some other engines, the PT6 turbine is also reversed. This facilitates the split-shaft arrangement where the engine and propeller are driven by separate (but in-line) shafts, each connected to their own turbine wheel.



PT6


Image: P&amp;W


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A contrasting and common design


Image:12Charlie