How fast does a helicopter go?

In 2013, a test of the X3 helicopter set a record for helicopter speed at 255 knots, or about 293 miles per hour, according to Wired magazine. However, the average non-military helicopter cruises at a speed of about 130 to 145 miles per hour, claims Air Business International.

The normal and top speeds of a helicopter vary based on the model of helicopter and factors such as the type of rotors used and how much power the helicopter can generate, according to a Helicopter FAQ page maintained by Air Business International. The amount of power generated depends on the type of engine, which is usually either a piston engine or a turbine engine.