Question

When operating in the slow flight speed range, the required power is greater than that for endurance because:

A) lift drag ratio is increased, and the drag decreased
B) lift drag ratio is reduced, and the drag increased
C) lift and drag remain constant
D) lift is reduced, and the drag remains constant

Answer 1

In slow flight, power requirements are higher because the lift-drag ratio is reduced, and drag is increased, necessitating greater power from the engines.

Step-by-step explanation:

When operating in the slow flight speed range, the required power is greater than that for endurance because B) the lift-drag ratio is reduced, and the drag increased. This is because, at slower speeds, airplanes must operate with a higher angle of attack to maintain lift, which in turn increases the drag on the aircraft. Furthermore, because drag is a significant factor at all speeds, and especially at slower speeds when it doesn't benefit from the advantages of reduced drag associated with higher velocities, the engines must work harder to overcome the increased drag thus requiring more power than that required for endurance, which typically takes place at a speed where the aircraft is most efficient.