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What kind of motion is produced by the hinged blade which is lying in the plane of rotor disk?(a) Flap motion(b) Lag motion(c) Yaw motion(d) Roll motionI had been asked this question during an online interview.This question is from Helicopter Rotor and Notations topic in chapter Helicopter Dynamics of Aerodynamics

Answer»

Correct choice is (a) FLAP motion

Easiest explanation: The hinged blade allows RIGID body rotation about the hinge point which is ACTED upon by restoring moment due to centrifugal force acting on the rotating blade. For the hinge that lies in the plane of the rotor disk, there’s an out-of-plane deflection of the blades produced. This is known as flap motion. When the deflection of blade along VERTICAL hinge arises, it is known as LAG motion.



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