Sikorsky S-69

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The Sikorsky S-69 was an experimental compound co-axial helicopter developed by Sikorsky.

1 Sikorsky S-69
2 Sikorsky X2
3 Specifications (S-69)
4 References
5 External links
6 Related content

[edit] Sikorsky S-69

Also known by the military designation XH-59A, the S-69 was part of the Advancing Blade Concept (ABC) program.^[1] This Advancing Blade Concept system consisted of two rigid, contra-rotating rotors which made use of the aerodynamic lift of the advancing blades. At high speeds, the retreating blades were offloaded, as most of the load was supported by the advancing blades of both rotors and the penalty due to stall of the retreating blade was thus eliminated. This system did not even require a wing to be fitted for high speeds and to improve manoeuvrability, and also eliminated the need for an anti-torque rotor at the tail.^[2]

[edit] Sikorsky X2

Sikorsky will also incorporate decades of company research and development into X2 Technology helicopters, including: the XH-59A Advancing Blade Concept Demonstrator which showed high speed was possible with a coaxial helicopter and auxiliary propulsion, the Cypher UAV which expanded company knowledge of the unique aspects of flight control laws in a fly by wire aircraft that employed coaxial rotors and the RAH-66 Comanche, which developed expertise in composite rotors and advanced transmission design.^[3]

[edit] Specifications (S-69)

This aircraft article is missing some (or all) of its specifications. If you have a source, you can help Wikipedia by adding them.

Data from Avia.Russian.ee Website^[2]

General characteristics

Crew: 2
Length: ft in (12.42m)
Rotor diameter: ft in (10.97 m)
Height: ft in (4.01m)
Max takeoff weight: lb (4960kg)
Powerplant:
- 2× Pratt & Whitney J60-P-3A turbojet, lbf (1350 kN) each
- 1× Pratt Whitney of Canada PT6T-3 Turbo Twin Pac turboshaft, hp (1360kW)