Sikorsky's X2 Technology has unofficially achieved a speed of 258 mph, which breaks the current record of 249 mph set in 1986 by the Westfield LYNX ZBX-500.

The Sikorsky X2 Technology is a triple-bladed experimental aircraft with an ability to travel long distances at high speeds. The helicopter also features counter-rotating rigid rotor blades, active vibration control, an integrated auxiliary propulsion system and fly-by-wire flight controls.

Siroksky is Stratford-based company that designs and manufactures helicopters.