The Boeing/Sikorsky RAH-66 Comanche was an advanced U.S. Army military helicopter intended for the armed reconnaissance role, incorporating stealth technologies. It was also intended to designate targets for the AH-64 Apache. The RAH-66 program was canceled in 2004 before it was fielded.

The RAH-66 is powered by two LHTEC T800 turboshaft engines. The RAH-66’s fuselage is 43 feet (13 m) long and is made of composite material. It incorporated stealth features to avoid detection, such as retractable weapon stations and main gun, and stealth faceting and radar absorbent materials. The Comanche’s noise signature is noticeably smaller than others in its class. The U.S. Army’s current armed scout helicopter is the OH-58D Kiowa Warrior, but it is an upgraded version of a Vietnam War-era observation helicopter. The Comanche however was specifically tailored to the role of armed scout. It is smaller and lighter than the AH-64 Apache attack helicopter.[14]

The Comanche’s very sophisticated detection and navigation systems were intended to allow it to operate at night and in bad weather. Its airframe was designed to fit more easily than the Apache into transport aircraft or onto transport ships, enabling it to be deployed to hot spots quickly. If transport assets were not available, the Comanche’s ferry range of 1,260 nautical miles (2,330 km; 1,450 mi) would allow it to fly to battlefields overseas on its own.

(data from Wikipedia.org: http://en.wikipedia.org/wiki/RAH-66_Comanche)