Well, I could of put link it the FS9 rotordyne post, but this is specific for FSX, so I'll use some of Nel's bandwidth for new post. The other video had really bad sound. This has 'updated' sound originally for F-27 'Dart' engines, modified by Mark Cranston from original sound by Ryuji Ozawa. Sound is HALF of the simming 'experience', is it not. Enjoy.
Edit: Shoot, forgot to list zip for the sound. Sound is inside 'f27-2t_m.zip' (F-27).