To achieve maximum range over the ground with a headwind, a turbojet should fly at what speed?

To achieve maximum range over the ground when flying into a headwind, a turbojet should fly at a speed that is typically higher than its minimum drag speed (VMD). This is because the wind component needs to be taken into account to ensure that distance covered over the ground is maximized despite the opposing wind.

The correct answer indicates flying at a speed of 1.32 times VMD. Flying at this speed balances the need for speed to counteract the headwind while still maintaining fuel efficiency, as maximum range is influenced by both the drag and the effective speed over the ground.

Flying at 1.32 VMD aids in ensuring that the aircraft maintains sufficient lift and reduces the time spent flying against the headwind, which both contribute positively to the overall efficiency and range of the flight. This choice reflects an optimal compromise between speed and fuel consumption, allowing the aircraft to maximize its reach while combating headwind resistance effectively.

In contrast, speeds that are significantly higher than 1.32 VMD may result in increased aerodynamic drag, thus diminishing the aircraft's range over the ground as fuel consumption would rise disproportionately to the benefit gained from any increase in groundspeed.