  |
AHS Documents Catalog - http://www.vtol.org/dbsearch/
The American Helicopter Society's online searchable database of technical publications. |
| |
Vertiflite - http://www.vtol.org/vertiflite/
The official publication of the American Helicopter Society. |
| |
Helicopter Aerodynamics - http://www.cgpp.com/heliaero.html
The College Park Press offers the classic "Aerodynamics of the Helicopter" by Alfred Gessow and Gary C. Myers Jr. |