What Is the Fastest Helicopter?

Answer

The Westland Lynx ZB500 holds the record as the world’s fastest helicopter, which is a slightly modified version that was clocked at 249.1 mph. In July 2010, a Sikorsky X2 unofficially clocked at 258 mph, although it has not been confirmed.
Q&A Related to "What Is the Fastest Helicopter"
Until recently, the Westland Lynx held the world speed record at 216knots. The new record holder is the Sikorsky X2.
http://wiki.answers.com/Q/What_is_the_fastest_heli...
The Westland Lynx ZB500 holds the record as the worlds fastest helicopter, a slightly
http://www.chacha.com/question/what-is-the-fastest...
The Boeing-Vertol CH-47 Chinook. Top speed of 170 knots (196 mph, 315 km/h). The largest users are the U.S. Army and the Royal Air Force.
http://www.kgbanswers.com/whats-the-armys-fastest-...
Westland Lynx helicopter (modified version holds absolute record) , it's production models are still up there around 175 knots. The AH-1 (twin engine model) has a top speeds of 190
http://answers.yahoo.com/question/index?qid=200803...
1 Additional Answer
The fastest helicopter is The Sikorsky X2 Helicopter. The X2 is still under testing and recently completed its first flight at 463 km/hr. It is powered by a Light Helicopter Turbine Engine Co (LHTEC) T800 engine and features fly-by-wire controls.
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