More Goonie Bird pic....

Krooser said
Isn't that just a turbo'd stock engine? Not a turbo prop...

You can read up on the "twin wasp." Those (at least used in DC-3) were supercharged not turbocharged

Pratt & Whitney R-1830 Twin Wasp - Wikipedia

The Basler conversions are a turbo prop, AKA jet shaft turbine