Which phenomenon describes rotor disk tilt during transition caused by uneven airflow?

Which phenomenon describes rotor disk tilt during transition caused by uneven airflow?

• A. Blowback
• B. Centripetal Force
• C. Chord
• D. CAS

Answer: (A)

During the transition from hover to forward flight, the airflow across the rotor disk is not the same on all parts of the disk. The advancing side encounters higher relative wind and generates more lift than the retreating side, creating a rolling moment that tilts the rotor plane. This tilt caused by uneven inflow is called blowback. The other terms don’t describe this aerodynamic effect: centripetal force is the inward pull needed for circular motion, the chord is a blade’s width measurement, and CAS is simply a speed reference.

During the transition from hover to forward flight, the airflow across the rotor disk is not the same on all parts of the disk. The advancing side encounters higher relative wind and generates more lift than the retreating side, creating a rolling moment that tilts the rotor plane. This tilt caused by uneven inflow is called blowback. The other terms don’t describe this aerodynamic effect: centripetal force is the inward pull needed for circular motion, the chord is a blade’s width measurement, and CAS is simply a speed reference.