During autorotation, which input is primarily used to prevent rotor RPM overspeed?

Unlock all questions

This demo includes only 20 questions. Upgrade to access hundreds of questions, flashcards, exam simulations, and disable ads.

Full question bankExam simulationsFlashcards
From $24.99Unlock all

Prepare for the Theory of Rotary Wing Flight Test. Sharpen your skills with flashcards and multiple choice questions, with hints and explanations for each. Ace your exam with confidence!

Multiple Choice

During autorotation, which input is primarily used to prevent rotor RPM overspeed?

Explanation:
The key idea is that rotor speed in autorotation is controlled mainly by blade pitch through the collective. Increasing blade pitch raises the rotor drag, which dissipates more energy from the rotor system and slows the rotor down toward the safe RPM range. So when the rotor is at risk of overspeed, you raise the collective to increase drag and bring NR back under control. Cyclic inputs mainly tilt the rotor disk and affect forward speed and lift distribution, not the primary power sink that sets rotor RPM in autorotation. Reducing throttle isn’t effective here because the engine isn’t driving the rotor during autorotation.

The key idea is that rotor speed in autorotation is controlled mainly by blade pitch through the collective. Increasing blade pitch raises the rotor drag, which dissipates more energy from the rotor system and slows the rotor down toward the safe RPM range. So when the rotor is at risk of overspeed, you raise the collective to increase drag and bring NR back under control.

Cyclic inputs mainly tilt the rotor disk and affect forward speed and lift distribution, not the primary power sink that sets rotor RPM in autorotation. Reducing throttle isn’t effective here because the engine isn’t driving the rotor during autorotation.

More Multiple Choice Questions
Subscribe

Get the latest from Examzify

You can unsubscribe at any time. Read our privacy policy