How much does a helicopter fly per hour

Traditional helicopters are not very fast, most of the helicopter's cruising speed (the most economical speed) is only more than one hundred kilometers per hour, high-speed flight is normal at about three hundred kilometers per hour, but the fuel consumption is very large, but the U.S. X-2 high-speed attack helicopters are very fast, and the current demonstration of the machine speed of 463 km / h. We look at the picture of the helicopter tail and the traditional does not The X-2 is a high-speed attack helicopter that is very fast.