Composite Helicopter based on OH58 Kiowa

"OH-58D AVX" is an interesting concept. The idea is to offer the Army a low-cost solution to its Armed Aerial Scout (AAS) requirement to replace the OH-58D and its cancelled successor, the Bell ARH-70A Armed Reconnaissance Helicopter. 

Replacing the four-blade rotor and tailrotor with coaxial rotors and ducted fans reduces the power required by 15-20%, says AVX, which in turn boosts the helicopter's hot-and-high performance with the existing engine. The company estimates the OH-58D AVX can meet or exceed the performance promised by the ARH.

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It resembles Sikorsky X-2, but with coaxial rotors rather than main rotor and tail rotor.