Helicopter Flying Handbook

[Toten]

I'm loving the Huey, and although I know a little of the theory of rotary wing flight I found myself looking for even more information to up my level of geekery. In my search I found this handy and free resource from the FAA:

 

http://www.faa.gov/regulations_policies/handbooks_manuals/aircraft/media/faa-h-8083-21A.pdf

 

My appologies if this has already been posted.