31. The range can be seen as the average ground speed multiplied by the maximum time in the air. 32. They need ground speed for navigation, but for safety and optimum fuel consumption air speed is what counts. 33. The true ground speed is determined by matching the center hole to the speed portion of the grid. 34. XI to measure its ground speed . 35. The goal is to have the actual ground speed be as far over the handicapped speed as possible. 36. This new instrumentation allowed operators to get better grain yields by optimizing ground speed and other operating parameters. 37. This system calculated ground speed based on driveshaft rotations and used a solenoid to vary throttle position as needed. 38. The aircraft flew at altitudes between and completed the trip around the world at an average ground speed of. 39. See air speed and ground speed , which can vary dramatically, say if the plane is in a jet stream. 40. This allows the ground speed of the machine to be varied while maintaining a constant engine and threshing speed.
