Sikorsky X2 Envelope Expansion Continues

http://www.aero-news.net/index.cfm?contentBlockId=7523c7f5-e88f-4780-bfc2-d3af042db4be#d

The X2 Technology demonstrator combines an integrated suite of
technologies intended to advance the state-of-the-art,
counter-rotating coaxial rotor helicopter. It is designed to
demonstrate that a helicopter can cruise comfortably at 250 knots
while retaining such desirable attributes as excellent low-speed
handling, efficient hovering, and a seamless and simple transition to
high speed.