For sale is a vintage publication, Rotary Wing Flight, FM 1-51. Housed in a ring binder, this helicopter guide was issued by the Department of the Army in Washington, D.C., in April 1979. About 150 pages long, it includes discussion on helicopter aerodynamics, common flight techniques, normal field operations, precautionary measures and critical conditions. This hard-to-find manual measures 7 3/4 by 10 1/4 inches and is in very good condition. The binder probably needs to be replaced; the spine is torn, but this is how I found it. See my listings for other vintage items, including historical publications. I gladly combine shipping fees for multiple purchases when they can be packaged together, and I do ship internationally. 

 Payment is expected within three days. Please e-mail me with any questions, and thanks for looking!