atmx2000
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Sikorsky X2 Coaxial Rotor Demonstrator

Thu Jul 27, 2006 4:55 pm

http://www.flightglobal.com/Articles...+together+for+December+flight.html

Sikorsky is building the coaxial-rotor high-speed helicopter to cruise at 250kt (460km/h), compared with 150-170kt for conventional helicopters

Can anyone comment on how the manufacturing costs of coax rotors will be compared to tilt rotors?
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N328KF
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RE: Sikorsky X2 Coaxial Rotor Demonstrator

Thu Jul 27, 2006 6:05 pm

Quoting Atmx2000 (Thread starter):
Can anyone comment on how the manufacturing costs of coax rotors will be compared to tilt rotors?

Kamov has been doing it for decades, and it was the primary technology for Soviet shipborne helicopters. Must not be too expensive.
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CTR
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RE: Sikorsky X2 Coaxial Rotor Demonstrator

Thu Jul 27, 2006 7:53 pm

Sikorsky's X-2 coaxial rotor is very different than a Kamov.

The X-2 is an evolution of the Sikorsky ABC (Advancing Blade Concept) demonstrator from 20 years ago and uses a rigid rotor without any lead-lag hinges or gimbles. A rigid rotor puts an incredible amount of load into the rotor mast. The ABC demonstrator had many problems (aside from crashing) including instability, minimum payload and excessive fuel consumption. Based on the ABC performance compared to the XV-15 tiltrotor, DOD decided to go with the JVX which became the V-22 tiltrotor.

Sikorsky is using fly-by-wire controls, composites and advances in aerodynamics in the X-2 to solve the ABC problems. I hope they are successful. But I don't believe however that the X-2 will be any less complex than a tiltrotor.

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