SIFT Army Aviation Information Test 2025 – 400 Free Practice Questions to Pass the Exam

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What happens to the lift generated by the helicopter when the airspeed increases?

It decreases

It increases

When a helicopter's airspeed increases, the lift generated by the rotor system actually increases, not decreases. This is mainly due to the fact that lift in rotary-wing aircraft is generated not only by the rotor blades' angle of attack but also by the speed of the air flowing over those blades.

As the airspeed grows, the flow of air over the rotor blades enhances the angle of attack, allowing for more lift to be produced. The relationship between lift and airspeed is pivotal; in many cases, a critical speed must be reached for a helicopter to achieve its best performance and efficiency.

An increase in airspeed decreases the angle of attack at which maximum lift occurs, but overall, as long as the rotor maintains an effective angle and performance, lift continues to increase with airspeed. The other options do not accurately capture the fundamental aerodynamic principles affecting lift in helicopter operation.

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It remains constant

It becomes erratic

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