What configuration provides the best range on a jet aircraft?

What configuration provides the best range on a jet aircraft?

• A. 1.20 VMd
• B. 1.32 VMd
• C. 1.37 VMd
• D. 1.50 VMd

Answer: (B)

The best range for a jet aircraft is achieved at a specific flight condition known as the cruise airspeed, which is typically defined by the concept of "VMO" (maximum operating speed) and "VMd" (minimum drag speed). The optimal airspeed for range is generally a balance between lift and drag. In the case of jet aircraft, flying at 1.32 times VMd is considered ideal because this configuration helps to minimize drag while maximizing lift-to-drag ratio. Operating at this point allows the aircraft to sustain the most aerodynamic efficiency over a longer distance, making it the configuration that provides the best range. Flying at a speed lower than this can increase drag significantly and, therefore, decrease range, while speeds higher than 1.32 VMd may require more thrust and lead to increased fuel consumption, also negatively affecting the range. The value of 1.32 VMd represents an optimal compromise which allows the aircraft to fly efficiently and cover the maximum distance with the least fuel consumption, making it the most effective choice for achieving the best range.

The best range for a jet aircraft is achieved at a specific flight condition known as the cruise airspeed, which is typically defined by the concept of "VMO" (maximum operating speed) and "VMd" (minimum drag speed). The optimal airspeed for range is generally a balance between lift and drag.

In the case of jet aircraft, flying at 1.32 times VMd is considered ideal because this configuration helps to minimize drag while maximizing lift-to-drag ratio. Operating at this point allows the aircraft to sustain the most aerodynamic efficiency over a longer distance, making it the configuration that provides the best range.

Flying at a speed lower than this can increase drag significantly and, therefore, decrease range, while speeds higher than 1.32 VMd may require more thrust and lead to increased fuel consumption, also negatively affecting the range. The value of 1.32 VMd represents an optimal compromise which allows the aircraft to fly efficiently and cover the maximum distance with the least fuel consumption, making it the most effective choice for achieving the best range.