How fast is the plane?

How fast is the plane? The car can check the speed by rolling the wheels. So how do you fly when an airplane isn't rolling wheels? There are several ways to measure airplane speed. First Protrudes like a beard in front of the plane, It's called a pitot tube. Because it was invented by a French scientist It's named after Henri Pito. Once the principle is If you put water in a bent straw The water..

원문링크 : How fast is the plane?