FLYBOYJ
"THE GREAT GAZOO"
I was told the Cheyenne reached about 220 knots (almost 250 mph) It was not done under controlled conditions so no recognition of it's speed was recognized. Also The configuration of its tail rotor did not qualify it as a bonafide helicopter.The AH-56 is reported to have a top speed of 220 knots, but is this true ? I was always under the impression that the modified Westland ZB500 G-Lynx still held the world record at 217.5 knots.