Douglas C-47 HD-Sound Set FS2004 and 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 and landing. Authentic flaps, gear, wind, start-up/shutdown, touchdown. Authentic exit opening and 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.