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| | A History of Helicopter Flight (Site not responding. Last check: 2007-10-22) |
 | | Yet, the quest for true mastery of the air continued to inspire many inventors and, in time, their work led to sustained technical efforts by trained engineers and, ultimately, to the successful development of the modern helicopter. |
 | | The technical contributions of Juan de la Cierva, Louis Breguet, Heinrich Focke, Raoul Hafner, Igor Sikorsky and Arthur Young stand out, and their work was instrumental in the design of truly safe and practical helicopters. |
 | | Focke, H. "The Focke Helicopter," NACA TM 858. |
| www.enae.umd.edu /AGRC/Aero/history.html (13614 words) |
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