Читать книгу Flight Theory and Aerodynamics - Joseph R. Badick - Страница 73

Groundspeed (GS) is the actual speed of the aircraft over the ground, either calculated manually or more commonly nowadays read off the GPS (Global Positioning Satellite) navigational unit. The GS increases with a tailwind and decreases with a headwind, and is TAS adjusted for the wind. Groundspeed equals true airspeed in a no wind situation. Consider an airplane that has departed an airport located at sea level, then lands on a runway located at 5000 ft. Even though the IAS on approach will remain the same as if the airplane was landing at sea level, the TAS (and GS) will be higher at the airport with the higher elevation, thus more runway will be utilized during the landing.