Helicopters are known to travel at speeds of about 130 or 140 knots, that’s about 160 mph. the Eurocopter X3 however pushes the speed needle a little above the top, turning out to be the fastest helicopter on the surface of the earth. For now a prototype, the Eurocopter X3 uses a hybrid system to take it to a whopping 267 mph in stable, level flight. For this, the Eurocopter X# uses two turboprops mounted on little wings by its sides. Now the mileage on this one probably might not stand out as much as that of a usual helicopter, though the speed at which it travels sure makes up for that shortcoming!

And we all know the fact that a person who can afford a helicopter usually doesn’t bother too much about fuel-efficiency.
[Dvice]