Douglas C-47 HD-Soundset FS2004 & FSX was produced using High Definition Real World Recordings Includes Authentic and Historically Correct R-1830-90 engine sounds with superchargers. Squeaks and Rattles on Roll-out&Landing. Authentic Flaps, gear, wind,start-up/shutdown, touchdown. Authentic Exit Opening&Closing sounds. Smooth throttle rpm transitions. Widened Cockpit Ambiance. Prop Flutter. Knocks and Pings. Exhaust. Flyby Ambiance. Also suitable for the C-53 Skytrooper. Sound-package has been engineered to fit the sound character of the aircraft inside and out.