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Helicopter Rotor Lead-Lag

For helicopter rotor blades, the lead-lag degree of freedom (also called hunt and drag) is essential for control of the helicopter. The video will show how blade flapping, which is also essential for control, moves the blade's center of gravity in and out from the center of rotation. This action changes the moment of inertia of the rotor blade. Because angular momentum must be conserved; anytime the moment of inertia increases, the blades angular velocity must decrease. Correspondingly, when the moment of inertia decreases, blade angular velocity must increase. The amount of blade lead-lag motion needed to compensate for flapping is relatively small. On the order of 1.2 - 2 degrees. But the in-plane drag on the blade also contributes to the mean lag angle by as much as 10 degrees. You may also want to watch my video on blade flapping:    • Helicopter Control - Flapping   And my video on swashplate control of feathering:    • Helicopter Swashplate Control   I consulted these references in making this video- Aerodynamics of the Helicopter, Gessow, A Meyers, G Helicopter Fundamentals and Basic Aerodynamics TH-73A, US Navy, 2024 Helicopter Flying Handbook, FAA, 2019 00:00 Intro 00:32 Why Teetering Rotors don't Lead and Lag 01:32 Flapping Moves the Blade Center of Gravity 02:11 Conservation of Angular Momentum 02:20 Terminology: Coriolis Force 02:54 Laws of Physics 03:47 Blade Response to Changes in Moment of Inertia 04:48 Forward Flight Considerations 05:18 The Lead-Lag Damper