41. The airplane s ground speed reaches maximum when it s heading downwind, and minimum when it s heading upwind. 42. :I think a lot of above responses are very thorough; but many have confused air speed with ground speed . 43. Had it been flying level, that means, it would have been traveling across land at that so-called ground speed . 44. The plane collided with the slope of a ravine at the ground speed of about 190 km / h. 45. It spends days and nights on the wing, with an average ground speed of, covering up to before landing. 46. Ground speed is just a pilot aid to estimate if the flight is on time, behind or ahead of schedule.47. In this case the error is simply the ground speed of the aircraft over this time, or about 30 feet. 48. This slowed the rotating speed on the input shaft of the transmission, thus slowing the ground speed for that gear. 49. Mach numbers are not used to describe ground speed . talk ) 02 : 31, 10 December 2014 ( UTC) 50. A headwind will reduce the ground speed needed for takeoff, as there is a greater flow of air over the wings.
