How fast can a helicopter go? If Sikorsky Aircraft's plans work out, the answer could be: a lot faster than is possible right now.
For several years, Sikorsky has been working on what it calls X2 technology, a suite of systems that it says could let a helicopter "cruise comfortably" at 250 knots. That would be a far zippier pace than most current rotary wing aircraft can handle. The UH-60L variant of Sikorsky's Blackhawk, for instance, can fly at about 150 knots.
The tilt-wing MV-22 Osprey, meanwhile, can hit speeds upward of 240 knots, but it'… Read more