Sikorsky X2 (Paperback)

High Quality Content by WIKIPEDIA articles! The Sikorsky X2 Demonstrator is an experimental compound co-axial helicopter under development by Sikorsky Aircraft. Sikorsky has incorporated decades of company research and development into X2 Technology helicopters. The S-69/XH-59A Advancing Blade Concept Demonstrator showed high speed was possible with a coaxial helicopter and auxiliary propulsion; the Cypher UAV expanded company knowledge of the unique aspects of flight control laws in a fly by wire aircraft with coaxial rotors; and the RAH-66 Comanche, which developed expertise in composite rotors and advanced transmission design.